r300/compiler: Refactor to allow different instruction types

Signed-off-by: Nicolai Hähnle <nhaehnle@gmail.com>

15 files changed, 433 insertions, 427 deletions

diff --git a/src/mesa/drivers/dri/r300/compiler/r300_fragprog.c b/src/mesa/drivers/dri/r300/compiler/r300_fragprog.c
index 94f8fdfea3..aa69b0fc72 100644
--- a/src/mesa/drivers/dri/r300/compiler/r300_fragprog.c
+++ b/src/mesa/drivers/dri/r300/compiler/r300_fragprog.c
@@ -55,75 +55,75 @@ int r300_transform_TEX(
 	struct r300_fragment_program_compiler *compiler =
 		(struct r300_fragment_program_compiler*)data;
 
-	if (inst->I.Opcode != RC_OPCODE_TEX &&
-	    inst->I.Opcode != RC_OPCODE_TXB &&
-	    inst->I.Opcode != RC_OPCODE_TXP &&
-	    inst->I.Opcode != RC_OPCODE_KIL)
+	if (inst->U.I.Opcode != RC_OPCODE_TEX &&
+	    inst->U.I.Opcode != RC_OPCODE_TXB &&
+	    inst->U.I.Opcode != RC_OPCODE_TXP &&
+	    inst->U.I.Opcode != RC_OPCODE_KIL)
 		return 0;
 
 	/* ARB_shadow & EXT_shadow_funcs */
-	if (inst->I.Opcode != RC_OPCODE_KIL &&
-	    c->Program.ShadowSamplers & (1 << inst->I.TexSrcUnit)) {
-		rc_compare_func comparefunc = compiler->state.unit[inst->I.TexSrcUnit].texture_compare_func;
+	if (inst->U.I.Opcode != RC_OPCODE_KIL &&
+	    c->Program.ShadowSamplers & (1 << inst->U.I.TexSrcUnit)) {
+		rc_compare_func comparefunc = compiler->state.unit[inst->U.I.TexSrcUnit].texture_compare_func;
 
 		if (comparefunc == RC_COMPARE_FUNC_NEVER || comparefunc == RC_COMPARE_FUNC_ALWAYS) {
-			inst->I.Opcode = RC_OPCODE_MOV;
+			inst->U.I.Opcode = RC_OPCODE_MOV;
 
 			if (comparefunc == RC_COMPARE_FUNC_ALWAYS) {
-				inst->I.SrcReg[0].File = RC_FILE_NONE;
-				inst->I.SrcReg[0].Swizzle = RC_SWIZZLE_1111;
+				inst->U.I.SrcReg[0].File = RC_FILE_NONE;
+				inst->U.I.SrcReg[0].Swizzle = RC_SWIZZLE_1111;
 			} else {
-				inst->I.SrcReg[0] = shadow_ambient(c, inst->I.TexSrcUnit);
+				inst->U.I.SrcReg[0] = shadow_ambient(c, inst->U.I.TexSrcUnit);
 			}
 
 			return 1;
 		} else {
-			rc_compare_func comparefunc = compiler->state.unit[inst->I.TexSrcUnit].texture_compare_func;
-			unsigned int depthmode = compiler->state.unit[inst->I.TexSrcUnit].depth_texture_mode;
+			rc_compare_func comparefunc = compiler->state.unit[inst->U.I.TexSrcUnit].texture_compare_func;
+			unsigned int depthmode = compiler->state.unit[inst->U.I.TexSrcUnit].depth_texture_mode;
 			struct rc_instruction * inst_rcp = rc_insert_new_instruction(c, inst);
 			struct rc_instruction * inst_mad = rc_insert_new_instruction(c, inst_rcp);
 			struct rc_instruction * inst_cmp = rc_insert_new_instruction(c, inst_mad);
 			int pass, fail;
 
-			inst_rcp->I.Opcode = RC_OPCODE_RCP;
-			inst_rcp->I.DstReg.File = RC_FILE_TEMPORARY;
-			inst_rcp->I.DstReg.Index = rc_find_free_temporary(c);
-			inst_rcp->I.DstReg.WriteMask = RC_MASK_W;
-			inst_rcp->I.SrcReg[0] = inst->I.SrcReg[0];
-			inst_rcp->I.SrcReg[0].Swizzle = RC_SWIZZLE_WWWW;
-
-			inst_cmp->I.DstReg = inst->I.DstReg;
-			inst->I.DstReg.File = RC_FILE_TEMPORARY;
-			inst->I.DstReg.Index = rc_find_free_temporary(c);
-			inst->I.DstReg.WriteMask = RC_MASK_XYZW;
-
-			inst_mad->I.Opcode = RC_OPCODE_MAD;
-			inst_mad->I.DstReg.File = RC_FILE_TEMPORARY;
-			inst_mad->I.DstReg.Index = rc_find_free_temporary(c);
-			inst_mad->I.SrcReg[0] = inst->I.SrcReg[0];
-			inst_mad->I.SrcReg[0].Swizzle = RC_SWIZZLE_ZZZZ;
-			inst_mad->I.SrcReg[1].File = RC_FILE_TEMPORARY;
-			inst_mad->I.SrcReg[1].Index = inst_rcp->I.DstReg.Index;
-			inst_mad->I.SrcReg[1].Swizzle = RC_SWIZZLE_WWWW;
-			inst_mad->I.SrcReg[2].File = RC_FILE_TEMPORARY;
-			inst_mad->I.SrcReg[2].Index = inst->I.DstReg.Index;
+			inst_rcp->U.I.Opcode = RC_OPCODE_RCP;
+			inst_rcp->U.I.DstReg.File = RC_FILE_TEMPORARY;
+			inst_rcp->U.I.DstReg.Index = rc_find_free_temporary(c);
+			inst_rcp->U.I.DstReg.WriteMask = RC_MASK_W;
+			inst_rcp->U.I.SrcReg[0] = inst->U.I.SrcReg[0];
+			inst_rcp->U.I.SrcReg[0].Swizzle = RC_SWIZZLE_WWWW;
+
+			inst_cmp->U.I.DstReg = inst->U.I.DstReg;
+			inst->U.I.DstReg.File = RC_FILE_TEMPORARY;
+			inst->U.I.DstReg.Index = rc_find_free_temporary(c);
+			inst->U.I.DstReg.WriteMask = RC_MASK_XYZW;
+
+			inst_mad->U.I.Opcode = RC_OPCODE_MAD;
+			inst_mad->U.I.DstReg.File = RC_FILE_TEMPORARY;
+			inst_mad->U.I.DstReg.Index = rc_find_free_temporary(c);
+			inst_mad->U.I.SrcReg[0] = inst->U.I.SrcReg[0];
+			inst_mad->U.I.SrcReg[0].Swizzle = RC_SWIZZLE_ZZZZ;
+			inst_mad->U.I.SrcReg[1].File = RC_FILE_TEMPORARY;
+			inst_mad->U.I.SrcReg[1].Index = inst_rcp->U.I.DstReg.Index;
+			inst_mad->U.I.SrcReg[1].Swizzle = RC_SWIZZLE_WWWW;
+			inst_mad->U.I.SrcReg[2].File = RC_FILE_TEMPORARY;
+			inst_mad->U.I.SrcReg[2].Index = inst->U.I.DstReg.Index;
 			if (depthmode == 0) /* GL_LUMINANCE */
-				inst_mad->I.SrcReg[2].Swizzle = RC_MAKE_SWIZZLE(RC_SWIZZLE_X, RC_SWIZZLE_Y, RC_SWIZZLE_Z, RC_SWIZZLE_Z);
+				inst_mad->U.I.SrcReg[2].Swizzle = RC_MAKE_SWIZZLE(RC_SWIZZLE_X, RC_SWIZZLE_Y, RC_SWIZZLE_Z, RC_SWIZZLE_Z);
 			else if (depthmode == 2) /* GL_ALPHA */
-				inst_mad->I.SrcReg[2].Swizzle = RC_SWIZZLE_WWWW;
+				inst_mad->U.I.SrcReg[2].Swizzle = RC_SWIZZLE_WWWW;
 
 			/* Recall that SrcReg[0] is tex, SrcReg[2] is r and:
 			 *   r  < tex  <=>      -tex+r < 0
 			 *   r >= tex  <=> not (-tex+r < 0 */
 			if (comparefunc == RC_COMPARE_FUNC_LESS || comparefunc == RC_COMPARE_FUNC_GEQUAL)
-				inst_mad->I.SrcReg[2].Negate = inst_mad->I.SrcReg[2].Negate ^ RC_MASK_XYZW;
+				inst_mad->U.I.SrcReg[2].Negate = inst_mad->U.I.SrcReg[2].Negate ^ RC_MASK_XYZW;
 			else
-				inst_mad->I.SrcReg[0].Negate = inst_mad->I.SrcReg[0].Negate ^ RC_MASK_XYZW;
+				inst_mad->U.I.SrcReg[0].Negate = inst_mad->U.I.SrcReg[0].Negate ^ RC_MASK_XYZW;
 
-			inst_cmp->I.Opcode = RC_OPCODE_CMP;
+			inst_cmp->U.I.Opcode = RC_OPCODE_CMP;
 			/* DstReg has been filled out above */
-			inst_cmp->I.SrcReg[0].File = RC_FILE_TEMPORARY;
-			inst_cmp->I.SrcReg[0].Index = inst_mad->I.DstReg.Index;
+			inst_cmp->U.I.SrcReg[0].File = RC_FILE_TEMPORARY;
+			inst_cmp->U.I.SrcReg[0].Index = inst_mad->U.I.DstReg.Index;
 
 			if (comparefunc == RC_COMPARE_FUNC_LESS || comparefunc == RC_COMPARE_FUNC_GREATER) {
 				pass = 1;
@@ -133,9 +133,9 @@ int r300_transform_TEX(
 				fail = 1;
 			}
 
-			inst_cmp->I.SrcReg[pass].File = RC_FILE_NONE;
-			inst_cmp->I.SrcReg[pass].Swizzle = RC_SWIZZLE_1111;
-			inst_cmp->I.SrcReg[fail] = shadow_ambient(c, inst->I.TexSrcUnit);
+			inst_cmp->U.I.SrcReg[pass].File = RC_FILE_NONE;
+			inst_cmp->U.I.SrcReg[pass].Swizzle = RC_SWIZZLE_1111;
+			inst_cmp->U.I.SrcReg[fail] = shadow_ambient(c, inst->U.I.TexSrcUnit);
 		}
 	}
 
@@ -143,49 +143,49 @@ int r300_transform_TEX(
 	 * instead of [0..Width]x[0..Height].
 	 * Add a scaling instruction.
 	 */
-	if (inst->I.Opcode != RC_OPCODE_KIL && inst->I.TexSrcTarget == RC_TEXTURE_RECT) {
+	if (inst->U.I.Opcode != RC_OPCODE_KIL && inst->U.I.TexSrcTarget == RC_TEXTURE_RECT) {
 		struct rc_instruction * inst_mul = rc_insert_new_instruction(c, inst->Prev);
 
-		inst_mul->I.Opcode = RC_OPCODE_MUL;
-		inst_mul->I.DstReg.File = RC_FILE_TEMPORARY;
-		inst_mul->I.DstReg.Index = rc_find_free_temporary(c);
-		inst_mul->I.SrcReg[0] = inst->I.SrcReg[0];
-		inst_mul->I.SrcReg[1].File = RC_FILE_CONSTANT;
-		inst_mul->I.SrcReg[1].Index = rc_constants_add_state(&c->Program.Constants, RC_STATE_R300_TEXRECT_FACTOR, inst->I.TexSrcUnit);
+		inst_mul->U.I.Opcode = RC_OPCODE_MUL;
+		inst_mul->U.I.DstReg.File = RC_FILE_TEMPORARY;
+		inst_mul->U.I.DstReg.Index = rc_find_free_temporary(c);
+		inst_mul->U.I.SrcReg[0] = inst->U.I.SrcReg[0];
+		inst_mul->U.I.SrcReg[1].File = RC_FILE_CONSTANT;
+		inst_mul->U.I.SrcReg[1].Index = rc_constants_add_state(&c->Program.Constants, RC_STATE_R300_TEXRECT_FACTOR, inst->U.I.TexSrcUnit);
 
-		reset_srcreg(&inst->I.SrcReg[0]);
-		inst->I.SrcReg[0].File = RC_FILE_TEMPORARY;
-		inst->I.SrcReg[0].Index = inst_mul->I.DstReg.Index;
+		reset_srcreg(&inst->U.I.SrcReg[0]);
+		inst->U.I.SrcReg[0].File = RC_FILE_TEMPORARY;
+		inst->U.I.SrcReg[0].Index = inst_mul->U.I.DstReg.Index;
 	}
 
 	/* Cannot write texture to output registers or with masks */
-	if (inst->I.Opcode != RC_OPCODE_KIL &&
-	    (inst->I.DstReg.File != RC_FILE_TEMPORARY || inst->I.DstReg.WriteMask != RC_MASK_XYZW)) {
+	if (inst->U.I.Opcode != RC_OPCODE_KIL &&
+	    (inst->U.I.DstReg.File != RC_FILE_TEMPORARY || inst->U.I.DstReg.WriteMask != RC_MASK_XYZW)) {
 		struct rc_instruction * inst_mov = rc_insert_new_instruction(c, inst);
 
-		inst_mov->I.Opcode = RC_OPCODE_MOV;
-		inst_mov->I.DstReg = inst->I.DstReg;
-		inst_mov->I.SrcReg[0].File = RC_FILE_TEMPORARY;
-		inst_mov->I.SrcReg[0].Index = rc_find_free_temporary(c);
+		inst_mov->U.I.Opcode = RC_OPCODE_MOV;
+		inst_mov->U.I.DstReg = inst->U.I.DstReg;
+		inst_mov->U.I.SrcReg[0].File = RC_FILE_TEMPORARY;
+		inst_mov->U.I.SrcReg[0].Index = rc_find_free_temporary(c);
 
-		inst->I.DstReg.File = RC_FILE_TEMPORARY;
-		inst->I.DstReg.Index = inst_mov->I.SrcReg[0].Index;
-		inst->I.DstReg.WriteMask = RC_MASK_XYZW;
+		inst->U.I.DstReg.File = RC_FILE_TEMPORARY;
+		inst->U.I.DstReg.Index = inst_mov->U.I.SrcReg[0].Index;
+		inst->U.I.DstReg.WriteMask = RC_MASK_XYZW;
 	}
 
 
 	/* Cannot read texture coordinate from constants file */
-	if (inst->I.SrcReg[0].File != RC_FILE_TEMPORARY && inst->I.SrcReg[0].File != RC_FILE_INPUT) {
+	if (inst->U.I.SrcReg[0].File != RC_FILE_TEMPORARY && inst->U.I.SrcReg[0].File != RC_FILE_INPUT) {
 		struct rc_instruction * inst_mov = rc_insert_new_instruction(c, inst->Prev);
 
-		inst_mov->I.Opcode = RC_OPCODE_MOV;
-		inst_mov->I.DstReg.File = RC_FILE_TEMPORARY;
-		inst_mov->I.DstReg.Index = rc_find_free_temporary(c);
-		inst_mov->I.SrcReg[0] = inst->I.SrcReg[0];
+		inst_mov->U.I.Opcode = RC_OPCODE_MOV;
+		inst_mov->U.I.DstReg.File = RC_FILE_TEMPORARY;
+		inst_mov->U.I.DstReg.Index = rc_find_free_temporary(c);
+		inst_mov->U.I.SrcReg[0] = inst->U.I.SrcReg[0];
 
-		reset_srcreg(&inst->I.SrcReg[0]);
-		inst->I.SrcReg[0].File = RC_FILE_TEMPORARY;
-		inst->I.SrcReg[0].Index = inst_mov->I.DstReg.Index;
+		reset_srcreg(&inst->U.I.SrcReg[0]);
+		inst->U.I.SrcReg[0].File = RC_FILE_TEMPORARY;
+		inst->U.I.SrcReg[0].Index = inst_mov->U.I.DstReg.Index;
 	}
 
 	return 1;
diff --git a/src/mesa/drivers/dri/r300/compiler/r3xx_fragprog.c b/src/mesa/drivers/dri/r300/compiler/r3xx_fragprog.c
index 614c2e3d24..746e4495fe 100644
--- a/src/mesa/drivers/dri/r300/compiler/r3xx_fragprog.c
+++ b/src/mesa/drivers/dri/r300/compiler/r3xx_fragprog.c
@@ -44,7 +44,7 @@ static void rewrite_depth_out(struct r300_fragment_program_compiler * c)
 	struct rc_instruction *rci;
 
 	for (rci = c->Base.Program.Instructions.Next; rci != &c->Base.Program.Instructions; rci = rci->Next) {
-		struct rc_sub_instruction * inst = &rci->I;
+		struct rc_sub_instruction * inst = &rci->U.I;
 
 		if (inst->DstReg.File != RC_FILE_OUTPUT || inst->DstReg.Index != c->OutputDepth)
 			continue;
diff --git a/src/mesa/drivers/dri/r300/compiler/r3xx_vertprog.c b/src/mesa/drivers/dri/r300/compiler/r3xx_vertprog.c
index e1e735568d..1b2cb8dde7 100644
--- a/src/mesa/drivers/dri/r300/compiler/r3xx_vertprog.c
+++ b/src/mesa/drivers/dri/r300/compiler/r3xx_vertprog.c
@@ -341,7 +341,7 @@ static void translate_vertex_program(struct r300_vertex_program_compiler * compi
 	compiler->SetHwInputOutput(compiler);
 
 	for(rci = compiler->Base.Program.Instructions.Next; rci != &compiler->Base.Program.Instructions; rci = rci->Next) {
-		struct rc_sub_instruction *vpi = &rci->I;
+		struct rc_sub_instruction *vpi = &rci->U.I;
 		unsigned int *inst = compiler->code->body.d + compiler->code->length;
 
 		/* Skip instructions writing to non-existing destination */
@@ -405,19 +405,19 @@ static void allocate_temporary_registers(struct r300_vertex_program_compiler * c
 
 	/* Pass 1: Count original temporaries and allocate structures */
 	for(inst = compiler->Base.Program.Instructions.Next; inst != &compiler->Base.Program.Instructions; inst = inst->Next) {
-		const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->I.Opcode);
+		const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->U.I.Opcode);
 
 		for (i = 0; i < opcode->NumSrcRegs; ++i) {
-			if (inst->I.SrcReg[i].File == RC_FILE_TEMPORARY) {
-				if (inst->I.SrcReg[i].Index >= num_orig_temps)
-					num_orig_temps = inst->I.SrcReg[i].Index + 1;
+			if (inst->U.I.SrcReg[i].File == RC_FILE_TEMPORARY) {
+				if (inst->U.I.SrcReg[i].Index >= num_orig_temps)
+					num_orig_temps = inst->U.I.SrcReg[i].Index + 1;
 			}
 		}
 
 		if (opcode->HasDstReg) {
-			if (inst->I.DstReg.File == RC_FILE_TEMPORARY) {
-				if (inst->I.DstReg.Index >= num_orig_temps)
-					num_orig_temps = inst->I.DstReg.Index + 1;
+			if (inst->U.I.DstReg.File == RC_FILE_TEMPORARY) {
+				if (inst->U.I.DstReg.Index >= num_orig_temps)
+					num_orig_temps = inst->U.I.DstReg.Index + 1;
 			}
 		}
 	}
@@ -428,22 +428,22 @@ static void allocate_temporary_registers(struct r300_vertex_program_compiler * c
 
 	/* Pass 2: Determine original temporary lifetimes */
 	for(inst = compiler->Base.Program.Instructions.Next; inst != &compiler->Base.Program.Instructions; inst = inst->Next) {
-		const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->I.Opcode);
+		const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->U.I.Opcode);
 
 		for (i = 0; i < opcode->NumSrcRegs; ++i) {
-			if (inst->I.SrcReg[i].File == RC_FILE_TEMPORARY)
-				ta[inst->I.SrcReg[i].Index].LastRead = inst;
+			if (inst->U.I.SrcReg[i].File == RC_FILE_TEMPORARY)
+				ta[inst->U.I.SrcReg[i].Index].LastRead = inst;
 		}
 	}
 
 	/* Pass 3: Register allocation */
 	for(inst = compiler->Base.Program.Instructions.Next; inst != &compiler->Base.Program.Instructions; inst = inst->Next) {
-		const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->I.Opcode);
+		const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->U.I.Opcode);
 
 		for (i = 0; i < opcode->NumSrcRegs; ++i) {
-			if (inst->I.SrcReg[i].File == RC_FILE_TEMPORARY) {
-				unsigned int orig = inst->I.SrcReg[i].Index;
-				inst->I.SrcReg[i].Index = ta[orig].HwTemp;
+			if (inst->U.I.SrcReg[i].File == RC_FILE_TEMPORARY) {
+				unsigned int orig = inst->U.I.SrcReg[i].Index;
+				inst->U.I.SrcReg[i].Index = ta[orig].HwTemp;
 
 				if (ta[orig].Allocated && inst == ta[orig].LastRead)
 					hwtemps[ta[orig].HwTemp] = 0;
@@ -451,8 +451,8 @@ static void allocate_temporary_registers(struct r300_vertex_program_compiler * c
 		}
 
 		if (opcode->HasDstReg) {
-			if (inst->I.DstReg.File == RC_FILE_TEMPORARY) {
-				unsigned int orig = inst->I.DstReg.Index;
+			if (inst->U.I.DstReg.File == RC_FILE_TEMPORARY) {
+				unsigned int orig = inst->U.I.DstReg.Index;
 
 				if (!ta[orig].Allocated) {
 					for(j = 0; j < VSF_MAX_FRAGMENT_TEMPS; ++j) {
@@ -471,7 +471,7 @@ static void allocate_temporary_registers(struct r300_vertex_program_compiler * c
 					}
 				}
 
-				inst->I.DstReg.Index = ta[orig].HwTemp;
+				inst->U.I.DstReg.Index = ta[orig].HwTemp;
 			}
 		}
 	}
@@ -487,36 +487,36 @@ static int transform_source_conflicts(
 	struct rc_instruction* inst,
 	void* unused)
 {
-	const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->I.Opcode);
+	const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->U.I.Opcode);
 
 	if (opcode->NumSrcRegs == 3) {
-		if (t_src_conflict(inst->I.SrcReg[1], inst->I.SrcReg[2])
-		    || t_src_conflict(inst->I.SrcReg[0], inst->I.SrcReg[2])) {
+		if (t_src_conflict(inst->U.I.SrcReg[1], inst->U.I.SrcReg[2])
+		    || t_src_conflict(inst->U.I.SrcReg[0], inst->U.I.SrcReg[2])) {
 			int tmpreg = rc_find_free_temporary(c);
 			struct rc_instruction * inst_mov = rc_insert_new_instruction(c, inst->Prev);
-			inst_mov->I.Opcode = RC_OPCODE_MOV;
-			inst_mov->I.DstReg.File = RC_FILE_TEMPORARY;
-			inst_mov->I.DstReg.Index = tmpreg;
-			inst_mov->I.SrcReg[0] = inst->I.SrcReg[2];
-
-			reset_srcreg(&inst->I.SrcReg[2]);
-			inst->I.SrcReg[2].File = RC_FILE_TEMPORARY;
-			inst->I.SrcReg[2].Index = tmpreg;
+			inst_mov->U.I.Opcode = RC_OPCODE_MOV;
+			inst_mov->U.I.DstReg.File = RC_FILE_TEMPORARY;
+			inst_mov->U.I.DstReg.Index = tmpreg;
+			inst_mov->U.I.SrcReg[0] = inst->U.I.SrcReg[2];
+
+			reset_srcreg(&inst->U.I.SrcReg[2]);
+			inst->U.I.SrcReg[2].File = RC_FILE_TEMPORARY;
+			inst->U.I.SrcReg[2].Index = tmpreg;
 		}
 	}
 
 	if (opcode->NumSrcRegs >= 2) {
-		if (t_src_conflict(inst->I.SrcReg[1], inst->I.SrcReg[0])) {
+		if (t_src_conflict(inst->U.I.SrcReg[1], inst->U.I.SrcReg[0])) {
 			int tmpreg = rc_find_free_temporary(c);
 			struct rc_instruction * inst_mov = rc_insert_new_instruction(c, inst->Prev);
-			inst_mov->I.Opcode = RC_OPCODE_MOV;
-			inst_mov->I.DstReg.File = RC_FILE_TEMPORARY;
-			inst_mov->I.DstReg.Index = tmpreg;
-			inst_mov->I.SrcReg[0] = inst->I.SrcReg[1];
-
-			reset_srcreg(&inst->I.SrcReg[1]);
-			inst->I.SrcReg[1].File = RC_FILE_TEMPORARY;
-			inst->I.SrcReg[1].Index = tmpreg;
+			inst_mov->U.I.Opcode = RC_OPCODE_MOV;
+			inst_mov->U.I.DstReg.File = RC_FILE_TEMPORARY;
+			inst_mov->U.I.DstReg.Index = tmpreg;
+			inst_mov->U.I.SrcReg[0] = inst->U.I.SrcReg[1];
+
+			reset_srcreg(&inst->U.I.SrcReg[1]);
+			inst->U.I.SrcReg[1].File = RC_FILE_TEMPORARY;
+			inst->U.I.SrcReg[1].Index = tmpreg;
 		}
 	}
 
@@ -531,15 +531,15 @@ static void addArtificialOutputs(struct r300_vertex_program_compiler * compiler)
 		if ((compiler->RequiredOutputs & (1 << i)) &&
 		    !(compiler->Base.Program.OutputsWritten & (1 << i))) {
 			struct rc_instruction * inst = rc_insert_new_instruction(&compiler->Base, compiler->Base.Program.Instructions.Prev);
-			inst->I.Opcode = RC_OPCODE_MOV;
+			inst->U.I.Opcode = RC_OPCODE_MOV;
 
-			inst->I.DstReg.File = RC_FILE_OUTPUT;
-			inst->I.DstReg.Index = i;
-			inst->I.DstReg.WriteMask = RC_MASK_XYZW;
+			inst->U.I.DstReg.File = RC_FILE_OUTPUT;
+			inst->U.I.DstReg.Index = i;
+			inst->U.I.DstReg.WriteMask = RC_MASK_XYZW;
 
-			inst->I.SrcReg[0].File = RC_FILE_CONSTANT;
-			inst->I.SrcReg[0].Index = 0;
-			inst->I.SrcReg[0].Swizzle = RC_SWIZZLE_XYZW;
+			inst->U.I.SrcReg[0].File = RC_FILE_CONSTANT;
+			inst->U.I.SrcReg[0].Index = 0;
+			inst->U.I.SrcReg[0].Swizzle = RC_SWIZZLE_XYZW;
 
 			compiler->Base.Program.OutputsWritten |= 1 << i;
 		}
diff --git a/src/mesa/drivers/dri/r300/compiler/r500_fragprog.c b/src/mesa/drivers/dri/r300/compiler/r500_fragprog.c
index 39f2445bd4..d87acecdab 100644
--- a/src/mesa/drivers/dri/r300/compiler/r500_fragprog.c
+++ b/src/mesa/drivers/dri/r300/compiler/r500_fragprog.c
@@ -54,75 +54,75 @@ int r500_transform_TEX(
 	struct r300_fragment_program_compiler *compiler =
 		(struct r300_fragment_program_compiler*)data;
 
-	if (inst->I.Opcode != RC_OPCODE_TEX &&
-	    inst->I.Opcode != RC_OPCODE_TXB &&
-	    inst->I.Opcode != RC_OPCODE_TXP &&
-	    inst->I.Opcode != RC_OPCODE_KIL)
+	if (inst->U.I.Opcode != RC_OPCODE_TEX &&
+	    inst->U.I.Opcode != RC_OPCODE_TXB &&
+	    inst->U.I.Opcode != RC_OPCODE_TXP &&
+	    inst->U.I.Opcode != RC_OPCODE_KIL)
 		return 0;
 
 	/* ARB_shadow & EXT_shadow_funcs */
-	if (inst->I.Opcode != RC_OPCODE_KIL &&
-	    c->Program.ShadowSamplers & (1 << inst->I.TexSrcUnit)) {
-		rc_compare_func comparefunc = compiler->state.unit[inst->I.TexSrcUnit].texture_compare_func;
+	if (inst->U.I.Opcode != RC_OPCODE_KIL &&
+	    c->Program.ShadowSamplers & (1 << inst->U.I.TexSrcUnit)) {
+		rc_compare_func comparefunc = compiler->state.unit[inst->U.I.TexSrcUnit].texture_compare_func;
 
 		if (comparefunc == RC_COMPARE_FUNC_NEVER || comparefunc == RC_COMPARE_FUNC_ALWAYS) {
-			inst->I.Opcode = RC_OPCODE_MOV;
+			inst->U.I.Opcode = RC_OPCODE_MOV;
 
 			if (comparefunc == RC_COMPARE_FUNC_ALWAYS) {
-				inst->I.SrcReg[0].File = RC_FILE_NONE;
-				inst->I.SrcReg[0].Swizzle = RC_SWIZZLE_1111;
+				inst->U.I.SrcReg[0].File = RC_FILE_NONE;
+				inst->U.I.SrcReg[0].Swizzle = RC_SWIZZLE_1111;
 			} else {
-				inst->I.SrcReg[0] = shadow_ambient(c, inst->I.TexSrcUnit);
+				inst->U.I.SrcReg[0] = shadow_ambient(c, inst->U.I.TexSrcUnit);
 			}
 
 			return 1;
 		} else {
-			rc_compare_func comparefunc = compiler->state.unit[inst->I.TexSrcUnit].texture_compare_func;
-			unsigned int depthmode = compiler->state.unit[inst->I.TexSrcUnit].depth_texture_mode;
+			rc_compare_func comparefunc = compiler->state.unit[inst->U.I.TexSrcUnit].texture_compare_func;
+			unsigned int depthmode = compiler->state.unit[inst->U.I.TexSrcUnit].depth_texture_mode;
 			struct rc_instruction * inst_rcp = rc_insert_new_instruction(c, inst);
 			struct rc_instruction * inst_mad = rc_insert_new_instruction(c, inst_rcp);
 			struct rc_instruction * inst_cmp = rc_insert_new_instruction(c, inst_mad);
 			int pass, fail;
 
-			inst_rcp->I.Opcode = RC_OPCODE_RCP;
-			inst_rcp->I.DstReg.File = RC_FILE_TEMPORARY;
-			inst_rcp->I.DstReg.Index = rc_find_free_temporary(c);
-			inst_rcp->I.DstReg.WriteMask = RC_MASK_W;
-			inst_rcp->I.SrcReg[0] = inst->I.SrcReg[0];
-			inst_rcp->I.SrcReg[0].Swizzle = RC_SWIZZLE_WWWW;
-
-			inst_cmp->I.DstReg = inst->I.DstReg;
-			inst->I.DstReg.File = RC_FILE_TEMPORARY;
-			inst->I.DstReg.Index = rc_find_free_temporary(c);
-			inst->I.DstReg.WriteMask = RC_MASK_XYZW;
-
-			inst_mad->I.Opcode = RC_OPCODE_MAD;
-			inst_mad->I.DstReg.File = RC_FILE_TEMPORARY;
-			inst_mad->I.DstReg.Index = rc_find_free_temporary(c);
-			inst_mad->I.SrcReg[0] = inst->I.SrcReg[0];
-			inst_mad->I.SrcReg[0].Swizzle = RC_SWIZZLE_ZZZZ;
-			inst_mad->I.SrcReg[1].File = RC_FILE_TEMPORARY;
-			inst_mad->I.SrcReg[1].Index = inst_rcp->I.DstReg.Index;
-			inst_mad->I.SrcReg[1].Swizzle = RC_SWIZZLE_WWWW;
-			inst_mad->I.SrcReg[2].File = RC_FILE_TEMPORARY;
-			inst_mad->I.SrcReg[2].Index = inst->I.DstReg.Index;
+			inst_rcp->U.I.Opcode = RC_OPCODE_RCP;
+			inst_rcp->U.I.DstReg.File = RC_FILE_TEMPORARY;
+			inst_rcp->U.I.DstReg.Index = rc_find_free_temporary(c);
+			inst_rcp->U.I.DstReg.WriteMask = RC_MASK_W;
+			inst_rcp->U.I.SrcReg[0] = inst->U.I.SrcReg[0];
+			inst_rcp->U.I.SrcReg[0].Swizzle = RC_SWIZZLE_WWWW;
+
+			inst_cmp->U.I.DstReg = inst->U.I.DstReg;
+			inst->U.I.DstReg.File = RC_FILE_TEMPORARY;
+			inst->U.I.DstReg.Index = rc_find_free_temporary(c);
+			inst->U.I.DstReg.WriteMask = RC_MASK_XYZW;
+
+			inst_mad->U.I.Opcode = RC_OPCODE_MAD;
+			inst_mad->U.I.DstReg.File = RC_FILE_TEMPORARY;
+			inst_mad->U.I.DstReg.Index = rc_find_free_temporary(c);
+			inst_mad->U.I.SrcReg[0] = inst->U.I.SrcReg[0];
+			inst_mad->U.I.SrcReg[0].Swizzle = RC_SWIZZLE_ZZZZ;
+			inst_mad->U.I.SrcReg[1].File = RC_FILE_TEMPORARY;
+			inst_mad->U.I.SrcReg[1].Index = inst_rcp->U.I.DstReg.Index;
+			inst_mad->U.I.SrcReg[1].Swizzle = RC_SWIZZLE_WWWW;
+			inst_mad->U.I.SrcReg[2].File = RC_FILE_TEMPORARY;
+			inst_mad->U.I.SrcReg[2].Index = inst->U.I.DstReg.Index;
 			if (depthmode == 0) /* GL_LUMINANCE */
-				inst_mad->I.SrcReg[2].Swizzle = RC_MAKE_SWIZZLE(RC_SWIZZLE_X, RC_SWIZZLE_Y, RC_SWIZZLE_Z, RC_SWIZZLE_Z);
+				inst_mad->U.I.SrcReg[2].Swizzle = RC_MAKE_SWIZZLE(RC_SWIZZLE_X, RC_SWIZZLE_Y, RC_SWIZZLE_Z, RC_SWIZZLE_Z);
 			else if (depthmode == 2) /* GL_ALPHA */
-				inst_mad->I.SrcReg[2].Swizzle = RC_SWIZZLE_WWWW;
+				inst_mad->U.I.SrcReg[2].Swizzle = RC_SWIZZLE_WWWW;
 
 			/* Recall that SrcReg[0] is tex, SrcReg[2] is r and:
 			 *   r  < tex  <=>      -tex+r < 0
 			 *   r >= tex  <=> not (-tex+r < 0 */
 			if (comparefunc == RC_COMPARE_FUNC_LESS || comparefunc == RC_COMPARE_FUNC_GEQUAL)
-				inst_mad->I.SrcReg[2].Negate = inst_mad->I.SrcReg[2].Negate ^ RC_MASK_XYZW;
+				inst_mad->U.I.SrcReg[2].Negate = inst_mad->U.I.SrcReg[2].Negate ^ RC_MASK_XYZW;
 			else
-				inst_mad->I.SrcReg[0].Negate = inst_mad->I.SrcReg[0].Negate ^ RC_MASK_XYZW;
+				inst_mad->U.I.SrcReg[0].Negate = inst_mad->U.I.SrcReg[0].Negate ^ RC_MASK_XYZW;
 
-			inst_cmp->I.Opcode = RC_OPCODE_CMP;
+			inst_cmp->U.I.Opcode = RC_OPCODE_CMP;
 			/* DstReg has been filled out above */
-			inst_cmp->I.SrcReg[0].File = RC_FILE_TEMPORARY;
-			inst_cmp->I.SrcReg[0].Index = inst_mad->I.DstReg.Index;
+			inst_cmp->U.I.SrcReg[0].File = RC_FILE_TEMPORARY;
+			inst_cmp->U.I.SrcReg[0].Index = inst_mad->U.I.DstReg.Index;
 
 			if (comparefunc == RC_COMPARE_FUNC_LESS || comparefunc == RC_COMPARE_FUNC_GREATER) {
 				pass = 1;
@@ -132,38 +132,38 @@ int r500_transform_TEX(
 				fail = 1;
 			}
 
-			inst_cmp->I.SrcReg[pass].File = RC_FILE_NONE;
-			inst_cmp->I.SrcReg[pass].Swizzle = RC_SWIZZLE_1111;
-			inst_cmp->I.SrcReg[fail] = shadow_ambient(c, inst->I.TexSrcUnit);
+			inst_cmp->U.I.SrcReg[pass].File = RC_FILE_NONE;
+			inst_cmp->U.I.SrcReg[pass].Swizzle = RC_SWIZZLE_1111;
+			inst_cmp->U.I.SrcReg[fail] = shadow_ambient(c, inst->U.I.TexSrcUnit);
 		}
 	}
 
 	/* Cannot write texture to output registers */
-	if (inst->I.Opcode != RC_OPCODE_KIL && inst->I.DstReg.File != RC_FILE_TEMPORARY) {
+	if (inst->U.I.Opcode != RC_OPCODE_KIL && inst->U.I.DstReg.File != RC_FILE_TEMPORARY) {
 		struct rc_instruction * inst_mov = rc_insert_new_instruction(c, inst);
 
-		inst_mov->I.Opcode = RC_OPCODE_MOV;
-		inst_mov->I.DstReg = inst->I.DstReg;
-		inst_mov->I.SrcReg[0].File = RC_FILE_TEMPORARY;
-		inst_mov->I.SrcReg[0].Index = rc_find_free_temporary(c);
+		inst_mov->U.I.Opcode = RC_OPCODE_MOV;
+		inst_mov->U.I.DstReg = inst->U.I.DstReg;
+		inst_mov->U.I.SrcReg[0].File = RC_FILE_TEMPORARY;
+		inst_mov->U.I.SrcReg[0].Index = rc_find_free_temporary(c);
 
-		inst->I.DstReg.File = RC_FILE_TEMPORARY;
-		inst->I.DstReg.Index = inst_mov->I.SrcReg[0].Index;
-		inst->I.DstReg.WriteMask = RC_MASK_XYZW;
+		inst->U.I.DstReg.File = RC_FILE_TEMPORARY;
+		inst->U.I.DstReg.Index = inst_mov->U.I.SrcReg[0].Index;
+		inst->U.I.DstReg.WriteMask = RC_MASK_XYZW;
 	}
 
 	/* Cannot read texture coordinate from constants file */
-	if (inst->I.SrcReg[0].File != RC_FILE_TEMPORARY && inst->I.SrcReg[0].File != RC_FILE_INPUT) {
+	if (inst->U.I.SrcReg[0].File != RC_FILE_TEMPORARY && inst->U.I.SrcReg[0].File != RC_FILE_INPUT) {
 		struct rc_instruction * inst_mov = rc_insert_new_instruction(c, inst->Prev);
 
-		inst_mov->I.Opcode = RC_OPCODE_MOV;
-		inst_mov->I.DstReg.File = RC_FILE_TEMPORARY;
-		inst_mov->I.DstReg.Index = rc_find_free_temporary(c);
-		inst_mov->I.SrcReg[0] = inst->I.SrcReg[0];
+		inst_mov->U.I.Opcode = RC_OPCODE_MOV;
+		inst_mov->U.I.DstReg.File = RC_FILE_TEMPORARY;
+		inst_mov->U.I.DstReg.Index = rc_find_free_temporary(c);
+		inst_mov->U.I.SrcReg[0] = inst->U.I.SrcReg[0];
 
-		reset_srcreg(&inst->I.SrcReg[0]);
-		inst->I.SrcReg[0].File = RC_FILE_TEMPORARY;
-		inst->I.SrcReg[0].Index = inst_mov->I.DstReg.Index;
+		reset_srcreg(&inst->U.I.SrcReg[0]);
+		inst->U.I.SrcReg[0].File = RC_FILE_TEMPORARY;
+		inst->U.I.SrcReg[0].Index = inst_mov->U.I.DstReg.Index;
 	}
 
 	return 1;
@@ -177,22 +177,22 @@ int r500_transform_IF(
 	struct rc_instruction * inst,
 	void* data)
 {
-	if (inst->I.Opcode != RC_OPCODE_IF)
+	if (inst->U.I.Opcode != RC_OPCODE_IF)
 		return 0;
 
 	struct rc_instruction * inst_mov = rc_insert_new_instruction(c, inst->Prev);
-	inst_mov->I.Opcode = RC_OPCODE_MOV;
-	inst_mov->I.DstReg.WriteMask = 0;
-	inst_mov->I.WriteALUResult = RC_ALURESULT_W;
-	inst_mov->I.ALUResultCompare = RC_COMPARE_FUNC_NOTEQUAL;
-	inst_mov->I.SrcReg[0] = inst->I.SrcReg[0];
-	inst_mov->I.SrcReg[0].Swizzle = combine_swizzles4(inst_mov->I.SrcReg[0].Swizzle,
+	inst_mov->U.I.Opcode = RC_OPCODE_MOV;
+	inst_mov->U.I.DstReg.WriteMask = 0;
+	inst_mov->U.I.WriteALUResult = RC_ALURESULT_W;
+	inst_mov->U.I.ALUResultCompare = RC_COMPARE_FUNC_NOTEQUAL;
+	inst_mov->U.I.SrcReg[0] = inst->U.I.SrcReg[0];
+	inst_mov->U.I.SrcReg[0].Swizzle = combine_swizzles4(inst_mov->U.I.SrcReg[0].Swizzle,
 			RC_SWIZZLE_UNUSED, RC_SWIZZLE_UNUSED, RC_SWIZZLE_UNUSED, RC_SWIZZLE_X);
 
-	inst->I.SrcReg[0].File = RC_FILE_SPECIAL;
-	inst->I.SrcReg[0].Index = RC_SPECIAL_ALU_RESULT;
-	inst->I.SrcReg[0].Swizzle = RC_SWIZZLE_XYZW;
-	inst->I.SrcReg[0].Negate = 0;
+	inst->U.I.SrcReg[0].File = RC_FILE_SPECIAL;
+	inst->U.I.SrcReg[0].Index = RC_SPECIAL_ALU_RESULT;
+	inst->U.I.SrcReg[0].Swizzle = RC_SWIZZLE_XYZW;
+	inst->U.I.SrcReg[0].Negate = 0;
 
 	return 1;
 }
diff --git a/src/mesa/drivers/dri/r300/compiler/radeon_compiler.c b/src/mesa/drivers/dri/r300/compiler/radeon_compiler.c
index d0b78ec1c8..c0e7a7f7a0 100644
--- a/src/mesa/drivers/dri/r300/compiler/radeon_compiler.c
+++ b/src/mesa/drivers/dri/r300/compiler/radeon_compiler.c
@@ -36,7 +36,7 @@ void rc_init(struct radeon_compiler * c)
 	memory_pool_init(&c->Pool);
 	c->Program.Instructions.Prev = &c->Program.Instructions;
 	c->Program.Instructions.Next = &c->Program.Instructions;
-	c->Program.Instructions.I.Opcode = RC_OPCODE_ILLEGAL_OPCODE;
+	c->Program.Instructions.U.I.Opcode = RC_OPCODE_ILLEGAL_OPCODE;
 }
 
 void rc_destroy(struct radeon_compiler * c)
@@ -113,17 +113,17 @@ void rc_calculate_inputs_outputs(struct radeon_compiler * c)
 
 	for(inst = c->Program.Instructions.Next; inst != &c->Program.Instructions; inst = inst->Next)
 	{
-		const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->I.Opcode);
+		const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->U.I.Opcode);
 		int i;
 
 		for (i = 0; i < opcode->NumSrcRegs; ++i) {
-			if (inst->I.SrcReg[i].File == RC_FILE_INPUT)
-				c->Program.InputsRead |= 1 << inst->I.SrcReg[i].Index;
+			if (inst->U.I.SrcReg[i].File == RC_FILE_INPUT)
+				c->Program.InputsRead |= 1 << inst->U.I.SrcReg[i].Index;
 		}
 
 		if (opcode->HasDstReg) {
-			if (inst->I.DstReg.File == RC_FILE_OUTPUT)
-				c->Program.OutputsWritten |= 1 << inst->I.DstReg.Index;
+			if (inst->U.I.DstReg.File == RC_FILE_OUTPUT)
+				c->Program.OutputsWritten |= 1 << inst->U.I.DstReg.Index;
 		}
 	}
 }
@@ -139,17 +139,17 @@ void rc_move_input(struct radeon_compiler * c, unsigned input, struct rc_src_reg
 	c->Program.InputsRead &= ~(1 << input);
 
 	for(inst = c->Program.Instructions.Next; inst != &c->Program.Instructions; inst = inst->Next) {
-		const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->I.Opcode);
+		const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->U.I.Opcode);
 		unsigned i;
 
 		for(i = 0; i < opcode->NumSrcRegs; ++i) {
-			if (inst->I.SrcReg[i].File == RC_FILE_INPUT && inst->I.SrcReg[i].Index == input) {
-				inst->I.SrcReg[i].File = new_input.File;
-				inst->I.SrcReg[i].Index = new_input.Index;
-				inst->I.SrcReg[i].Swizzle = combine_swizzles(new_input.Swizzle, inst->I.SrcReg[i].Swizzle);
-				if (!inst->I.SrcReg[i].Abs) {
-					inst->I.SrcReg[i].Negate ^= new_input.Negate;
-					inst->I.SrcReg[i].Abs = new_input.Abs;
+			if (inst->U.I.SrcReg[i].File == RC_FILE_INPUT && inst->U.I.SrcReg[i].Index == input) {
+				inst->U.I.SrcReg[i].File = new_input.File;
+				inst->U.I.SrcReg[i].Index = new_input.Index;
+				inst->U.I.SrcReg[i].Swizzle = combine_swizzles(new_input.Swizzle, inst->U.I.SrcReg[i].Swizzle);
+				if (!inst->U.I.SrcReg[i].Abs) {
+					inst->U.I.SrcReg[i].Negate ^= new_input.Negate;
+					inst->U.I.SrcReg[i].Abs = new_input.Abs;
 				}
 
 				c->Program.InputsRead |= 1 << new_input.Index;
@@ -171,12 +171,12 @@ void rc_move_output(struct radeon_compiler * c, unsigned output, unsigned new_ou
 	c->Program.OutputsWritten &= ~(1 << output);
 
 	for(inst = c->Program.Instructions.Next; inst != &c->Program.Instructions; inst = inst->Next) {
-		const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->I.Opcode);
+		const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->U.I.Opcode);
 
 		if (opcode->HasDstReg) {
-			if (inst->I.DstReg.File == RC_FILE_OUTPUT && inst->I.DstReg.Index == output) {
-				inst->I.DstReg.Index = new_output;
-				inst->I.DstReg.WriteMask &= writemask;
+			if (inst->U.I.DstReg.File == RC_FILE_OUTPUT && inst->U.I.DstReg.Index == output) {
+				inst->U.I.DstReg.Index = new_output;
+				inst->U.I.DstReg.WriteMask &= writemask;
 
 				c->Program.OutputsWritten |= 1 << new_output;
 			}
@@ -194,33 +194,33 @@ void rc_copy_output(struct radeon_compiler * c, unsigned output, unsigned dup_ou
 	struct rc_instruction * inst;
 
 	for(inst = c->Program.Instructions.Next; inst != &c->Program.Instructions; inst = inst->Next) {
-		const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->I.Opcode);
+		const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->U.I.Opcode);
 
 		if (opcode->HasDstReg) {
-			if (inst->I.DstReg.File == RC_FILE_OUTPUT && inst->I.DstReg.Index == output) {
-				inst->I.DstReg.File = RC_FILE_TEMPORARY;
-				inst->I.DstReg.Index = tempreg;
+			if (inst->U.I.DstReg.File == RC_FILE_OUTPUT && inst->U.I.DstReg.Index == output) {
+				inst->U.I.DstReg.File = RC_FILE_TEMPORARY;
+				inst->U.I.DstReg.Index = tempreg;
 			}
 		}
 	}
 
 	inst = rc_insert_new_instruction(c, c->Program.Instructions.Prev);
-	inst->I.Opcode = RC_OPCODE_MOV;
-	inst->I.DstReg.File = RC_FILE_OUTPUT;
-	inst->I.DstReg.Index = output;
+	inst->U.I.Opcode = RC_OPCODE_MOV;
+	inst->U.I.DstReg.File = RC_FILE_OUTPUT;
+	inst->U.I.DstReg.Index = output;
 
-	inst->I.SrcReg[0].File = RC_FILE_TEMPORARY;
-	inst->I.SrcReg[0].Index = tempreg;
-	inst->I.SrcReg[0].Swizzle = RC_SWIZZLE_XYZW;
+	inst->U.I.SrcReg[0].File = RC_FILE_TEMPORARY;
+	inst->U.I.SrcReg[0].Index = tempreg;
+	inst->U.I.SrcReg[0].Swizzle = RC_SWIZZLE_XYZW;
 
 	inst = rc_insert_new_instruction(c, c->Program.Instructions.Prev);
-	inst->I.Opcode = RC_OPCODE_MOV;
-	inst->I.DstReg.File = RC_FILE_OUTPUT;
-	inst->I.DstReg.Index = dup_output;
+	inst->U.I.Opcode = RC_OPCODE_MOV;
+	inst->U.I.DstReg.File = RC_FILE_OUTPUT;
+	inst->U.I.DstReg.Index = dup_output;
 
-	inst->I.SrcReg[0].File = RC_FILE_TEMPORARY;
-	inst->I.SrcReg[0].Index = tempreg;
-	inst->I.SrcReg[0].Swizzle = RC_SWIZZLE_XYZW;
+	inst->U.I.SrcReg[0].File = RC_FILE_TEMPORARY;
+	inst->U.I.SrcReg[0].Index = tempreg;
+	inst->U.I.SrcReg[0].Swizzle = RC_SWIZZLE_XYZW;
 
 	c->Program.OutputsWritten |= 1 << dup_output;
 }
@@ -238,60 +238,60 @@ void rc_transform_fragment_wpos(struct radeon_compiler * c, unsigned wpos, unsig
 
 	/* perspective divide */
 	struct rc_instruction * inst_rcp = rc_insert_new_instruction(c, &c->Program.Instructions);
-	inst_rcp->I.Opcode = RC_OPCODE_RCP;
+	inst_rcp->U.I.Opcode = RC_OPCODE_RCP;
 
-	inst_rcp->I.DstReg.File = RC_FILE_TEMPORARY;
-	inst_rcp->I.DstReg.Index = tempregi;
-	inst_rcp->I.DstReg.WriteMask = RC_MASK_W;
+	inst_rcp->U.I.DstReg.File = RC_FILE_TEMPORARY;
+	inst_rcp->U.I.DstReg.Index = tempregi;
+	inst_rcp->U.I.DstReg.WriteMask = RC_MASK_W;
 
-	inst_rcp->I.SrcReg[0].File = RC_FILE_INPUT;
-	inst_rcp->I.SrcReg[0].Index = new_input;
-	inst_rcp->I.SrcReg[0].Swizzle = RC_SWIZZLE_WWWW;
+	inst_rcp->U.I.SrcReg[0].File = RC_FILE_INPUT;
+	inst_rcp->U.I.SrcReg[0].Index = new_input;
+	inst_rcp->U.I.SrcReg[0].Swizzle = RC_SWIZZLE_WWWW;
 
 	struct rc_instruction * inst_mul = rc_insert_new_instruction(c, inst_rcp);
-	inst_mul->I.Opcode = RC_OPCODE_MUL;
+	inst_mul->U.I.Opcode = RC_OPCODE_MUL;
 
-	inst_mul->I.DstReg.File = RC_FILE_TEMPORARY;
-	inst_mul->I.DstReg.Index = tempregi;
-	inst_mul->I.DstReg.WriteMask = RC_MASK_XYZ;
+	inst_mul->U.I.DstReg.File = RC_FILE_TEMPORARY;
+	inst_mul->U.I.DstReg.Index = tempregi;
+	inst_mul->U.I.DstReg.WriteMask = RC_MASK_XYZ;
 
-	inst_mul->I.SrcReg[0].File = RC_FILE_INPUT;
-	inst_mul->I.SrcReg[0].Index = new_input;
+	inst_mul->U.I.SrcReg[0].File = RC_FILE_INPUT;
+	inst_mul->U.I.SrcReg[0].Index = new_input;
 
-	inst_mul->I.SrcReg[1].File = RC_FILE_TEMPORARY;
-	inst_mul->I.SrcReg[1].Index = tempregi;
-	inst_mul->I.SrcReg[1].Swizzle = RC_SWIZZLE_WWWW;
+	inst_mul->U.I.SrcReg[1].File = RC_FILE_TEMPORARY;
+	inst_mul->U.I.SrcReg[1].Index = tempregi;
+	inst_mul->U.I.SrcReg[1].Swizzle = RC_SWIZZLE_WWWW;
 
 	/* viewport transformation */
 	struct rc_instruction * inst_mad = rc_insert_new_instruction(c, inst_mul);
-	inst_mad->I.Opcode = RC_OPCODE_MAD;
+	inst_mad->U.I.Opcode = RC_OPCODE_MAD;
 
-	inst_mad->I.DstReg.File = RC_FILE_TEMPORARY;
-	inst_mad->I.DstReg.Index = tempregi;
-	inst_mad->I.DstReg.WriteMask = RC_MASK_XYZ;
+	inst_mad->U.I.DstReg.File = RC_FILE_TEMPORARY;
+	inst_mad->U.I.DstReg.Index = tempregi;
+	inst_mad->U.I.DstReg.WriteMask = RC_MASK_XYZ;
 
-	inst_mad->I.SrcReg[0].File = RC_FILE_TEMPORARY;
-	inst_mad->I.SrcReg[0].Index = tempregi;
-	inst_mad->I.SrcReg[0].Swizzle = RC_MAKE_SWIZZLE(RC_SWIZZLE_X, RC_SWIZZLE_Y, RC_SWIZZLE_Z, RC_SWIZZLE_ZERO);
+	inst_mad->U.I.SrcReg[0].File = RC_FILE_TEMPORARY;
+	inst_mad->U.I.SrcReg[0].Index = tempregi;
+	inst_mad->U.I.SrcReg[0].Swizzle = RC_MAKE_SWIZZLE(RC_SWIZZLE_X, RC_SWIZZLE_Y, RC_SWIZZLE_Z, RC_SWIZZLE_ZERO);
 
-	inst_mad->I.SrcReg[1].File = RC_FILE_CONSTANT;
-	inst_mad->I.SrcReg[1].Index = rc_constants_add_state(&c->Program.Constants, RC_STATE_R300_WINDOW_DIMENSION, 0);
-	inst_mad->I.SrcReg[1].Swizzle = RC_MAKE_SWIZZLE(RC_SWIZZLE_X, RC_SWIZZLE_Y, RC_SWIZZLE_Z, RC_SWIZZLE_ZERO);
+	inst_mad->U.I.SrcReg[1].File = RC_FILE_CONSTANT;
+	inst_mad->U.I.SrcReg[1].Index = rc_constants_add_state(&c->Program.Constants, RC_STATE_R300_WINDOW_DIMENSION, 0);
+	inst_mad->U.I.SrcReg[1].Swizzle = RC_MAKE_SWIZZLE(RC_SWIZZLE_X, RC_SWIZZLE_Y, RC_SWIZZLE_Z, RC_SWIZZLE_ZERO);
 
-	inst_mad->I.SrcReg[2].File = RC_FILE_CONSTANT;
-	inst_mad->I.SrcReg[2].Index = inst_mad->I.SrcReg[1].Index;
-	inst_mad->I.SrcReg[2].Swizzle = RC_MAKE_SWIZZLE(RC_SWIZZLE_X, RC_SWIZZLE_Y, RC_SWIZZLE_Z, RC_SWIZZLE_ZERO);
+	inst_mad->U.I.SrcReg[2].File = RC_FILE_CONSTANT;
+	inst_mad->U.I.SrcReg[2].Index = inst_mad->U.I.SrcReg[1].Index;
+	inst_mad->U.I.SrcReg[2].Swizzle = RC_MAKE_SWIZZLE(RC_SWIZZLE_X, RC_SWIZZLE_Y, RC_SWIZZLE_Z, RC_SWIZZLE_ZERO);
 
 	struct rc_instruction * inst;
 	for (inst = inst_mad->Next; inst != &c->Program.Instructions; inst = inst->Next) {
-		const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->I.Opcode);
+		const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->U.I.Opcode);
 		unsigned i;
 
 		for(i = 0; i < opcode->NumSrcRegs; i++) {
-			if (inst->I.SrcReg[i].File == RC_FILE_INPUT &&
-			    inst->I.SrcReg[i].Index == wpos) {
-				inst->I.SrcReg[i].File = RC_FILE_TEMPORARY;
-				inst->I.SrcReg[i].Index = tempregi;
+			if (inst->U.I.SrcReg[i].File == RC_FILE_INPUT &&
+			    inst->U.I.SrcReg[i].Index == wpos) {
+				inst->U.I.SrcReg[i].File = RC_FILE_TEMPORARY;
+				inst->U.I.SrcReg[i].Index = tempregi;
 			}
 		}
 	}
diff --git a/src/mesa/drivers/dri/r300/compiler/radeon_dataflow_deadcode.c b/src/mesa/drivers/dri/r300/compiler/radeon_dataflow_deadcode.c
index 2ae3c56689..f30b1ff067 100644
--- a/src/mesa/drivers/dri/r300/compiler/radeon_dataflow_deadcode.c
+++ b/src/mesa/drivers/dri/r300/compiler/radeon_dataflow_deadcode.c
@@ -134,26 +134,26 @@ static void mark_used(struct deadcode_state * s, rc_register_file file, unsigned
 
 static void update_instruction(struct deadcode_state * s, struct rc_instruction * inst)
 {
-	const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->I.Opcode);
+	const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->U.I.Opcode);
 	struct instruction_state * insts = &s->Instructions[inst->IP];
 	unsigned int usedmask = 0;
 
 	if (opcode->HasDstReg) {
-		unsigned char * pused = get_used_ptr(s, inst->I.DstReg.File, inst->I.DstReg.Index);
+		unsigned char * pused = get_used_ptr(s, inst->U.I.DstReg.File, inst->U.I.DstReg.Index);
 		if (pused) {
-			usedmask = *pused & inst->I.DstReg.WriteMask;
+			usedmask = *pused & inst->U.I.DstReg.WriteMask;
 			*pused &= ~usedmask;
 		}
 	}
 
 	insts->WriteMask |= usedmask;
 
-	if (inst->I.WriteALUResult) {
+	if (inst->U.I.WriteALUResult) {
 		unsigned char * pused = get_used_ptr(s, RC_FILE_SPECIAL, RC_SPECIAL_ALU_RESULT);
 		if (pused && *pused) {
-			if (inst->I.WriteALUResult == RC_ALURESULT_X)
+			if (inst->U.I.WriteALUResult == RC_ALURESULT_X)
 				usedmask |= RC_MASK_X;
-			else if (inst->I.WriteALUResult == RC_ALURESULT_W)
+			else if (inst->U.I.WriteALUResult == RC_ALURESULT_W)
 				usedmask |= RC_MASK_W;
 
 			*pused = 0;
@@ -171,7 +171,7 @@ static void update_instruction(struct deadcode_state * s, struct rc_instruction
 
 		for(unsigned int chan = 0; chan < 4; ++chan) {
 			if (GET_BIT(newsrcmask, chan))
-				refmask |= 1 << GET_SWZ(inst->I.SrcReg[src].Swizzle, chan);
+				refmask |= 1 << GET_SWZ(inst->U.I.SrcReg[src].Swizzle, chan);
 		}
 
 		/* get rid of spurious bits from ZERO, ONE, etc. swizzles */
@@ -180,9 +180,9 @@ static void update_instruction(struct deadcode_state * s, struct rc_instruction
 		if (!refmask)
 			continue;
 
-		mark_used(s, inst->I.SrcReg[src].File, inst->I.SrcReg[src].Index, refmask);
+		mark_used(s, inst->U.I.SrcReg[src].File, inst->U.I.SrcReg[src].Index, refmask);
 
-		if (inst->I.SrcReg[src].RelAddr)
+		if (inst->U.I.SrcReg[src].RelAddr)
 			mark_used(s, RC_FILE_ADDRESS, 0, RC_MASK_X);
 	}
 }
@@ -211,7 +211,7 @@ void rc_dataflow_deadcode(struct radeon_compiler * c, rc_dataflow_mark_outputs_f
 	for(struct rc_instruction * inst = c->Program.Instructions.Prev;
 	    inst != &c->Program.Instructions;
 	    inst = inst->Prev) {
-		const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->I.Opcode);
+		const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->U.I.Opcode);
 
 		if (opcode->IsControlFlow) {
 			if (opcode->Opcode == RC_OPCODE_ENDIF) {
@@ -250,20 +250,20 @@ void rc_dataflow_deadcode(struct radeon_compiler * c, rc_dataflow_mark_outputs_f
 	for(struct rc_instruction * inst = c->Program.Instructions.Next;
 	    inst != &c->Program.Instructions;
 	    inst = inst->Next, ++ip) {
-		const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->I.Opcode);\
+		const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->U.I.Opcode);\
 		int dead = 1;
 
 		if (!opcode->HasDstReg) {
 			dead = 0;
 		} else {
-			inst->I.DstReg.WriteMask = s.Instructions[ip].WriteMask;
+			inst->U.I.DstReg.WriteMask = s.Instructions[ip].WriteMask;
 			if (s.Instructions[ip].WriteMask)
 				dead = 0;
 
 			if (s.Instructions[ip].WriteALUResult)
 				dead = 0;
 			else
-				inst->I.WriteALUResult = RC_ALURESULT_NONE;
+				inst->U.I.WriteALUResult = RC_ALURESULT_NONE;
 		}
 
 		if (dead) {
@@ -276,9 +276,9 @@ void rc_dataflow_deadcode(struct radeon_compiler * c, rc_dataflow_mark_outputs_f
 		unsigned int srcmasks[3];
 		unsigned int usemask = s.Instructions[ip].WriteMask;
 
-		if (inst->I.WriteALUResult == RC_ALURESULT_X)
+		if (inst->U.I.WriteALUResult == RC_ALURESULT_X)
 			usemask |= RC_MASK_X;
-		else if (inst->I.WriteALUResult == RC_ALURESULT_W)
+		else if (inst->U.I.WriteALUResult == RC_ALURESULT_W)
 			usemask |= RC_MASK_W;
 
 		rc_compute_sources_for_writemask(opcode, usemask, srcmasks);
@@ -286,7 +286,7 @@ void rc_dataflow_deadcode(struct radeon_compiler * c, rc_dataflow_mark_outputs_f
 		for(unsigned int src = 0; src < 3; ++src) {
 			for(unsigned int chan = 0; chan < 4; ++chan) {
 				if (!GET_BIT(srcmasks[src], chan))
-					SET_SWZ(inst->I.SrcReg[src].Swizzle, chan, RC_SWIZZLE_UNUSED);
+					SET_SWZ(inst->U.I.SrcReg[src].Swizzle, chan, RC_SWIZZLE_UNUSED);
 			}
 		}
 	}
diff --git a/src/mesa/drivers/dri/r300/compiler/radeon_dataflow_swizzles.c b/src/mesa/drivers/dri/r300/compiler/radeon_dataflow_swizzles.c
index fcef218b59..33acbd30f4 100644
--- a/src/mesa/drivers/dri/r300/compiler/radeon_dataflow_swizzles.c
+++ b/src/mesa/drivers/dri/r300/compiler/radeon_dataflow_swizzles.c
@@ -40,48 +40,48 @@ static void rewrite_source(struct radeon_compiler * c,
 
 	usemask = 0;
 	for(unsigned int chan = 0; chan < 4; ++chan) {
-		if (GET_SWZ(inst->I.SrcReg[src].Swizzle, chan) != RC_SWIZZLE_UNUSED)
+		if (GET_SWZ(inst->U.I.SrcReg[src].Swizzle, chan) != RC_SWIZZLE_UNUSED)
 			usemask |= 1 << chan;
 	}
 
-	c->SwizzleCaps->Split(inst->I.SrcReg[src], usemask, &split);
+	c->SwizzleCaps->Split(inst->U.I.SrcReg[src], usemask, &split);
 
 	for(unsigned int phase = 0; phase < split.NumPhases; ++phase) {
 		struct rc_instruction * mov = rc_insert_new_instruction(c, inst->Prev);
 		unsigned int phase_refmask;
 		unsigned int masked_negate;
 
-		mov->I.Opcode = RC_OPCODE_MOV;
-		mov->I.DstReg.File = RC_FILE_TEMPORARY;
-		mov->I.DstReg.Index = tempreg;
-		mov->I.DstReg.WriteMask = split.Phase[phase];
-		mov->I.SrcReg[0] = inst->I.SrcReg[src];
+		mov->U.I.Opcode = RC_OPCODE_MOV;
+		mov->U.I.DstReg.File = RC_FILE_TEMPORARY;
+		mov->U.I.DstReg.Index = tempreg;
+		mov->U.I.DstReg.WriteMask = split.Phase[phase];
+		mov->U.I.SrcReg[0] = inst->U.I.SrcReg[src];
 
 		phase_refmask = 0;
 		for(unsigned int chan = 0; chan < 4; ++chan) {
 			if (!GET_BIT(split.Phase[phase], chan))
-				SET_SWZ(mov->I.SrcReg[0].Swizzle, chan, RC_SWIZZLE_UNUSED);
+				SET_SWZ(mov->U.I.SrcReg[0].Swizzle, chan, RC_SWIZZLE_UNUSED);
 			else
-				phase_refmask |= 1 << GET_SWZ(mov->I.SrcReg[0].Swizzle, chan);
+				phase_refmask |= 1 << GET_SWZ(mov->U.I.SrcReg[0].Swizzle, chan);
 		}
 
 		phase_refmask &= RC_MASK_XYZW;
 
-		masked_negate = split.Phase[phase] & mov->I.SrcReg[0].Negate;
+		masked_negate = split.Phase[phase] & mov->U.I.SrcReg[0].Negate;
 		if (masked_negate == 0)
-			mov->I.SrcReg[0].Negate = 0;
+			mov->U.I.SrcReg[0].Negate = 0;
 		else if (masked_negate == split.Phase[phase])
-			mov->I.SrcReg[0].Negate = RC_MASK_XYZW;
+			mov->U.I.SrcReg[0].Negate = RC_MASK_XYZW;
 
 	}
 
-	inst->I.SrcReg[src].File = RC_FILE_TEMPORARY;
-	inst->I.SrcReg[src].Index = tempreg;
-	inst->I.SrcReg[src].Swizzle = 0;
-	inst->I.SrcReg[src].Negate = RC_MASK_NONE;
-	inst->I.SrcReg[src].Abs = 0;
+	inst->U.I.SrcReg[src].File = RC_FILE_TEMPORARY;
+	inst->U.I.SrcReg[src].Index = tempreg;
+	inst->U.I.SrcReg[src].Swizzle = 0;
+	inst->U.I.SrcReg[src].Negate = RC_MASK_NONE;
+	inst->U.I.SrcReg[src].Abs = 0;
 	for(unsigned int chan = 0; chan < 4; ++chan) {
-		SET_SWZ(inst->I.SrcReg[src].Swizzle, chan,
+		SET_SWZ(inst->U.I.SrcReg[src].Swizzle, chan,
 				GET_BIT(usemask, chan) ? chan : RC_SWIZZLE_UNUSED);
 	}
 }
@@ -91,11 +91,11 @@ void rc_dataflow_swizzles(struct radeon_compiler * c)
 	struct rc_instruction * inst;
 
 	for(inst = c->Program.Instructions.Next; inst != &c->Program.Instructions; inst = inst->Next) {
-		const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->I.Opcode);
+		const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->U.I.Opcode);
 		unsigned int src;
 
 		for(src = 0; src < opcode->NumSrcRegs; ++src) {
-			if (!c->SwizzleCaps->IsNative(inst->I.Opcode, inst->I.SrcReg[src]))
+			if (!c->SwizzleCaps->IsNative(inst->U.I.Opcode, inst->U.I.SrcReg[src]))
 				rewrite_source(c, inst, src);
 		}
 	}
diff --git a/src/mesa/drivers/dri/r300/compiler/radeon_program.c b/src/mesa/drivers/dri/r300/compiler/radeon_program.c
index a1ee7c0cab..68a093b8c0 100644
--- a/src/mesa/drivers/dri/r300/compiler/radeon_program.c
+++ b/src/mesa/drivers/dri/r300/compiler/radeon_program.c
@@ -98,7 +98,7 @@ unsigned int rc_find_free_temporary(struct radeon_compiler * c)
 	memset(used, 0, sizeof(used));
 
 	for (struct rc_instruction * rcinst = c->Program.Instructions.Next; rcinst != &c->Program.Instructions; rcinst = rcinst->Next) {
-		const struct rc_sub_instruction *inst = &rcinst->I;
+		const struct rc_sub_instruction *inst = &rcinst->U.I;
 		const struct rc_opcode_info *opcode = rc_get_opcode_info(inst->Opcode);
 		unsigned int k;
 
@@ -129,11 +129,11 @@ struct rc_instruction *rc_alloc_instruction(struct radeon_compiler * c)
 
 	memset(inst, 0, sizeof(struct rc_instruction));
 
-	inst->I.Opcode = RC_OPCODE_ILLEGAL_OPCODE;
-	inst->I.DstReg.WriteMask = RC_MASK_XYZW;
-	inst->I.SrcReg[0].Swizzle = RC_SWIZZLE_XYZW;
-	inst->I.SrcReg[1].Swizzle = RC_SWIZZLE_XYZW;
-	inst->I.SrcReg[2].Swizzle = RC_SWIZZLE_XYZW;
+	inst->U.I.Opcode = RC_OPCODE_ILLEGAL_OPCODE;
+	inst->U.I.DstReg.WriteMask = RC_MASK_XYZW;
+	inst->U.I.SrcReg[0].Swizzle = RC_SWIZZLE_XYZW;
+	inst->U.I.SrcReg[1].Swizzle = RC_SWIZZLE_XYZW;
+	inst->U.I.SrcReg[2].Swizzle = RC_SWIZZLE_XYZW;
 
 	return inst;
 }
diff --git a/src/mesa/drivers/dri/r300/compiler/radeon_program.h b/src/mesa/drivers/dri/r300/compiler/radeon_program.h
index 071b0a0ca9..067cb545fd 100644
--- a/src/mesa/drivers/dri/r300/compiler/radeon_program.h
+++ b/src/mesa/drivers/dri/r300/compiler/radeon_program.h
@@ -109,11 +109,19 @@ struct rc_sub_instruction {
 	/*@}*/
 };
 
+typedef enum {
+	RC_INSTRUCTION_NORMAL = 0,
+	RC_INSTRUCTION_PAIR
+} rc_instruction_type;
+
 struct rc_instruction {
 	struct rc_instruction * Prev;
 	struct rc_instruction * Next;
 
-	struct rc_sub_instruction I;
+	rc_instruction_type Type;
+	union {
+		struct rc_sub_instruction I;
+	} U;
 
 	/**
 	 * Warning: IPs are not stable. If you want to use them,
diff --git a/src/mesa/drivers/dri/r300/compiler/radeon_program_alu.c b/src/mesa/drivers/dri/r300/compiler/radeon_program_alu.c
index e25bc4ec87..425b929668 100644
--- a/src/mesa/drivers/dri/r300/compiler/radeon_program_alu.c
+++ b/src/mesa/drivers/dri/r300/compiler/radeon_program_alu.c
@@ -45,10 +45,10 @@ static struct rc_instruction *emit1(
 {
 	struct rc_instruction *fpi = rc_insert_new_instruction(c, after);
 
-	fpi->I.Opcode = Opcode;
-	fpi->I.SaturateMode = Saturate;
-	fpi->I.DstReg = DstReg;
-	fpi->I.SrcReg[0] = SrcReg;
+	fpi->U.I.Opcode = Opcode;
+	fpi->U.I.SaturateMode = Saturate;
+	fpi->U.I.DstReg = DstReg;
+	fpi->U.I.SrcReg[0] = SrcReg;
 	return fpi;
 }
 
@@ -59,11 +59,11 @@ static struct rc_instruction *emit2(
 {
 	struct rc_instruction *fpi = rc_insert_new_instruction(c, after);
 
-	fpi->I.Opcode = Opcode;
-	fpi->I.SaturateMode = Saturate;
-	fpi->I.DstReg = DstReg;
-	fpi->I.SrcReg[0] = SrcReg0;
-	fpi->I.SrcReg[1] = SrcReg1;
+	fpi->U.I.Opcode = Opcode;
+	fpi->U.I.SaturateMode = Saturate;
+	fpi->U.I.DstReg = DstReg;
+	fpi->U.I.SrcReg[0] = SrcReg0;
+	fpi->U.I.SrcReg[1] = SrcReg1;
 	return fpi;
 }
 
@@ -75,12 +75,12 @@ static struct rc_instruction *emit3(
 {
 	struct rc_instruction *fpi = rc_insert_new_instruction(c, after);
 
-	fpi->I.Opcode = Opcode;
-	fpi->I.SaturateMode = Saturate;
-	fpi->I.DstReg = DstReg;
-	fpi->I.SrcReg[0] = SrcReg0;
-	fpi->I.SrcReg[1] = SrcReg1;
-	fpi->I.SrcReg[2] = SrcReg2;
+	fpi->U.I.Opcode = Opcode;
+	fpi->U.I.SaturateMode = Saturate;
+	fpi->U.I.DstReg = DstReg;
+	fpi->U.I.SrcReg[0] = SrcReg0;
+	fpi->U.I.SrcReg[1] = SrcReg1;
+	fpi->U.I.SrcReg[2] = SrcReg2;
 	return fpi;
 }
 
@@ -168,36 +168,36 @@ static struct rc_src_register scalar(struct rc_src_register reg)
 static void transform_ABS(struct radeon_compiler* c,
 	struct rc_instruction* inst)
 {
-	struct rc_src_register src = inst->I.SrcReg[0];
+	struct rc_src_register src = inst->U.I.SrcReg[0];
 	src.Abs = 1;
 	src.Negate = RC_MASK_NONE;
-	emit1(c, inst->Prev, RC_OPCODE_MOV, inst->I.SaturateMode, inst->I.DstReg, src);
+	emit1(c, inst->Prev, RC_OPCODE_MOV, inst->U.I.SaturateMode, inst->U.I.DstReg, src);
 	rc_remove_instruction(inst);
 }
 
 static void transform_DP3(struct radeon_compiler* c,
 	struct rc_instruction* inst)
 {
-	struct rc_src_register src0 = inst->I.SrcReg[0];
-	struct rc_src_register src1 = inst->I.SrcReg[1];
+	struct rc_src_register src0 = inst->U.I.SrcReg[0];
+	struct rc_src_register src1 = inst->U.I.SrcReg[1];
 	src0.Negate &= ~RC_MASK_W;
 	src0.Swizzle &= ~(7 << (3 * 3));
 	src0.Swizzle |= RC_SWIZZLE_ZERO << (3 * 3);
 	src1.Negate &= ~RC_MASK_W;
 	src1.Swizzle &= ~(7 << (3 * 3));
 	src1.Swizzle |= RC_SWIZZLE_ZERO << (3 * 3);
-	emit2(c, inst->Prev, RC_OPCODE_DP4, inst->I.SaturateMode, inst->I.DstReg, src0, src1);
+	emit2(c, inst->Prev, RC_OPCODE_DP4, inst->U.I.SaturateMode, inst->U.I.DstReg, src0, src1);
 	rc_remove_instruction(inst);
 }
 
 static void transform_DPH(struct radeon_compiler* c,
 	struct rc_instruction* inst)
 {
-	struct rc_src_register src0 = inst->I.SrcReg[0];
+	struct rc_src_register src0 = inst->U.I.SrcReg[0];
 	src0.Negate &= ~RC_MASK_W;
 	src0.Swizzle &= ~(7 << (3 * 3));
 	src0.Swizzle |= RC_SWIZZLE_ONE << (3 * 3);
-	emit2(c, inst->Prev, RC_OPCODE_DP4, inst->I.SaturateMode, inst->I.DstReg, src0, inst->I.SrcReg[1]);
+	emit2(c, inst->Prev, RC_OPCODE_DP4, inst->U.I.SaturateMode, inst->U.I.DstReg, src0, inst->U.I.SrcReg[1]);
 	rc_remove_instruction(inst);
 }
 
@@ -208,9 +208,9 @@ static void transform_DPH(struct radeon_compiler* c,
 static void transform_DST(struct radeon_compiler* c,
 	struct rc_instruction* inst)
 {
-	emit2(c, inst->Prev, RC_OPCODE_MUL, inst->I.SaturateMode, inst->I.DstReg,
-		swizzle(inst->I.SrcReg[0], RC_SWIZZLE_ONE, RC_SWIZZLE_Y, RC_SWIZZLE_Z, RC_SWIZZLE_ONE),
-		swizzle(inst->I.SrcReg[1], RC_SWIZZLE_ONE, RC_SWIZZLE_Y, RC_SWIZZLE_ONE, RC_SWIZZLE_W));
+	emit2(c, inst->Prev, RC_OPCODE_MUL, inst->U.I.SaturateMode, inst->U.I.DstReg,
+		swizzle(inst->U.I.SrcReg[0], RC_SWIZZLE_ONE, RC_SWIZZLE_Y, RC_SWIZZLE_Z, RC_SWIZZLE_ONE),
+		swizzle(inst->U.I.SrcReg[1], RC_SWIZZLE_ONE, RC_SWIZZLE_Y, RC_SWIZZLE_ONE, RC_SWIZZLE_W));
 	rc_remove_instruction(inst);
 }
 
@@ -218,9 +218,9 @@ static void transform_FLR(struct radeon_compiler* c,
 	struct rc_instruction* inst)
 {
 	int tempreg = rc_find_free_temporary(c);
-	emit1(c, inst->Prev, RC_OPCODE_FRC, 0, dstreg(RC_FILE_TEMPORARY, tempreg), inst->I.SrcReg[0]);
-	emit2(c, inst->Prev, RC_OPCODE_ADD, inst->I.SaturateMode, inst->I.DstReg,
-		inst->I.SrcReg[0], negate(srcreg(RC_FILE_TEMPORARY, tempreg)));
+	emit1(c, inst->Prev, RC_OPCODE_FRC, 0, dstreg(RC_FILE_TEMPORARY, tempreg), inst->U.I.SrcReg[0]);
+	emit2(c, inst->Prev, RC_OPCODE_ADD, inst->U.I.SaturateMode, inst->U.I.DstReg,
+		inst->U.I.SrcReg[0], negate(srcreg(RC_FILE_TEMPORARY, tempreg)));
 	rc_remove_instruction(inst);
 }
 
@@ -252,19 +252,19 @@ static void transform_LIT(struct radeon_compiler* c,
 
 	constant = rc_constants_add_immediate_scalar(&c->Program.Constants, -127.999999, &constant_swizzle);
 
-	if (inst->I.DstReg.WriteMask != RC_MASK_XYZW || inst->I.DstReg.File != RC_FILE_TEMPORARY) {
+	if (inst->U.I.DstReg.WriteMask != RC_MASK_XYZW || inst->U.I.DstReg.File != RC_FILE_TEMPORARY) {
 		struct rc_instruction * inst_mov;
 
 		inst_mov = emit1(c, inst,
-			RC_OPCODE_MOV, 0, inst->I.DstReg,
+			RC_OPCODE_MOV, 0, inst->U.I.DstReg,
 			srcreg(RC_FILE_TEMPORARY, rc_find_free_temporary(c)));
 
-		inst->I.DstReg.File = RC_FILE_TEMPORARY;
-		inst->I.DstReg.Index = inst_mov->I.SrcReg[0].Index;
-		inst->I.DstReg.WriteMask = RC_MASK_XYZW;
+		inst->U.I.DstReg.File = RC_FILE_TEMPORARY;
+		inst->U.I.DstReg.Index = inst_mov->U.I.SrcReg[0].Index;
+		inst->U.I.DstReg.WriteMask = RC_MASK_XYZW;
 	}
 
-	temp = inst->I.DstReg.Index;
+	temp = inst->U.I.DstReg.Index;
 	srctemp = srcreg(RC_FILE_TEMPORARY, temp);
 
 	// tmp.x = max(0.0, Src.x);
@@ -272,7 +272,7 @@ static void transform_LIT(struct radeon_compiler* c,
 	// tmp.w = clamp(Src.z, -128+eps, 128-eps);
 	emit2(c, inst->Prev, RC_OPCODE_MAX, 0,
 		dstregtmpmask(temp, RC_MASK_XYW),
-		inst->I.SrcReg[0],
+		inst->U.I.SrcReg[0],
 		swizzle(srcreg(RC_FILE_CONSTANT, constant),
 			RC_SWIZZLE_ZERO, RC_SWIZZLE_ZERO, RC_SWIZZLE_ZERO, constant_swizzle&3));
 	emit2(c, inst->Prev, RC_OPCODE_MIN, 0,
@@ -293,14 +293,14 @@ static void transform_LIT(struct radeon_compiler* c,
 		swizzle(srctemp, RC_SWIZZLE_W, RC_SWIZZLE_W, RC_SWIZZLE_W, RC_SWIZZLE_W));
 
 	// tmp.z = (tmp.x > 0) ? tmp.w : 0.0
-	emit3(c, inst->Prev, RC_OPCODE_CMP, inst->I.SaturateMode,
+	emit3(c, inst->Prev, RC_OPCODE_CMP, inst->U.I.SaturateMode,
 		dstregtmpmask(temp, RC_MASK_Z),
 		negate(swizzle(srctemp, RC_SWIZZLE_X, RC_SWIZZLE_X, RC_SWIZZLE_X, RC_SWIZZLE_X)),
 		swizzle(srctemp, RC_SWIZZLE_W, RC_SWIZZLE_W, RC_SWIZZLE_W, RC_SWIZZLE_W),
 		builtin_zero);
 
 	// tmp.x, tmp.y, tmp.w = 1.0, tmp.x, 1.0
-	emit1(c, inst->Prev, RC_OPCODE_MOV, inst->I.SaturateMode,
+	emit1(c, inst->Prev, RC_OPCODE_MOV, inst->U.I.SaturateMode,
 		dstregtmpmask(temp, RC_MASK_XYW),
 		swizzle(srctemp, RC_SWIZZLE_ONE, RC_SWIZZLE_X, RC_SWIZZLE_ONE, RC_SWIZZLE_ONE));
 
@@ -314,10 +314,10 @@ static void transform_LRP(struct radeon_compiler* c,
 
 	emit2(c, inst->Prev, RC_OPCODE_ADD, 0,
 		dstreg(RC_FILE_TEMPORARY, tempreg),
-		inst->I.SrcReg[1], negate(inst->I.SrcReg[2]));
-	emit3(c, inst->Prev, RC_OPCODE_MAD, inst->I.SaturateMode,
-		inst->I.DstReg,
-		inst->I.SrcReg[0], srcreg(RC_FILE_TEMPORARY, tempreg), inst->I.SrcReg[2]);
+		inst->U.I.SrcReg[1], negate(inst->U.I.SrcReg[2]));
+	emit3(c, inst->Prev, RC_OPCODE_MAD, inst->U.I.SaturateMode,
+		inst->U.I.DstReg,
+		inst->U.I.SrcReg[0], srcreg(RC_FILE_TEMPORARY, tempreg), inst->U.I.SrcReg[2]);
 
 	rc_remove_instruction(inst);
 }
@@ -331,9 +331,9 @@ static void transform_POW(struct radeon_compiler* c,
 	tempdst.WriteMask = RC_MASK_W;
 	tempsrc.Swizzle = RC_SWIZZLE_WWWW;
 
-	emit1(c, inst->Prev, RC_OPCODE_LG2, 0, tempdst, scalar(inst->I.SrcReg[0]));
-	emit2(c, inst->Prev, RC_OPCODE_MUL, 0, tempdst, tempsrc, scalar(inst->I.SrcReg[1]));
-	emit1(c, inst->Prev, RC_OPCODE_EX2, inst->I.SaturateMode, inst->I.DstReg, tempsrc);
+	emit1(c, inst->Prev, RC_OPCODE_LG2, 0, tempdst, scalar(inst->U.I.SrcReg[0]));
+	emit2(c, inst->Prev, RC_OPCODE_MUL, 0, tempdst, tempsrc, scalar(inst->U.I.SrcReg[1]));
+	emit1(c, inst->Prev, RC_OPCODE_EX2, inst->U.I.SaturateMode, inst->U.I.DstReg, tempsrc);
 
 	rc_remove_instruction(inst);
 }
@@ -341,7 +341,7 @@ static void transform_POW(struct radeon_compiler* c,
 static void transform_RSQ(struct radeon_compiler* c,
 	struct rc_instruction* inst)
 {
-	inst->I.SrcReg[0] = absolute(inst->I.SrcReg[0]);
+	inst->U.I.SrcReg[0] = absolute(inst->U.I.SrcReg[0]);
 }
 
 static void transform_SGE(struct radeon_compiler* c,
@@ -349,8 +349,8 @@ static void transform_SGE(struct radeon_compiler* c,
 {
 	int tempreg = rc_find_free_temporary(c);
 
-	emit2(c, inst->Prev, RC_OPCODE_ADD, 0, dstreg(RC_FILE_TEMPORARY, tempreg), inst->I.SrcReg[0], negate(inst->I.SrcReg[1]));
-	emit3(c, inst->Prev, RC_OPCODE_CMP, inst->I.SaturateMode, inst->I.DstReg,
+	emit2(c, inst->Prev, RC_OPCODE_ADD, 0, dstreg(RC_FILE_TEMPORARY, tempreg), inst->U.I.SrcReg[0], negate(inst->U.I.SrcReg[1]));
+	emit3(c, inst->Prev, RC_OPCODE_CMP, inst->U.I.SaturateMode, inst->U.I.DstReg,
 		srcreg(RC_FILE_TEMPORARY, tempreg), builtin_zero, builtin_one);
 
 	rc_remove_instruction(inst);
@@ -361,8 +361,8 @@ static void transform_SLT(struct radeon_compiler* c,
 {
 	int tempreg = rc_find_free_temporary(c);
 
-	emit2(c, inst->Prev, RC_OPCODE_ADD, 0, dstreg(RC_FILE_TEMPORARY, tempreg), inst->I.SrcReg[0], negate(inst->I.SrcReg[1]));
-	emit3(c, inst->Prev, RC_OPCODE_CMP, inst->I.SaturateMode, inst->I.DstReg,
+	emit2(c, inst->Prev, RC_OPCODE_ADD, 0, dstreg(RC_FILE_TEMPORARY, tempreg), inst->U.I.SrcReg[0], negate(inst->U.I.SrcReg[1]));
+	emit3(c, inst->Prev, RC_OPCODE_CMP, inst->U.I.SaturateMode, inst->U.I.DstReg,
 		srcreg(RC_FILE_TEMPORARY, tempreg), builtin_one, builtin_zero);
 
 	rc_remove_instruction(inst);
@@ -371,14 +371,14 @@ static void transform_SLT(struct radeon_compiler* c,
 static void transform_SUB(struct radeon_compiler* c,
 	struct rc_instruction* inst)
 {
-	inst->I.Opcode = RC_OPCODE_ADD;
-	inst->I.SrcReg[1] = negate(inst->I.SrcReg[1]);
+	inst->U.I.Opcode = RC_OPCODE_ADD;
+	inst->U.I.SrcReg[1] = negate(inst->U.I.SrcReg[1]);
 }
 
 static void transform_SWZ(struct radeon_compiler* c,
 	struct rc_instruction* inst)
 {
-	inst->I.Opcode = RC_OPCODE_MOV;
+	inst->U.I.Opcode = RC_OPCODE_MOV;
 }
 
 static void transform_XPD(struct radeon_compiler* c,
@@ -387,11 +387,11 @@ static void transform_XPD(struct radeon_compiler* c,
 	int tempreg = rc_find_free_temporary(c);
 
 	emit2(c, inst->Prev, RC_OPCODE_MUL, 0, dstreg(RC_FILE_TEMPORARY, tempreg),
-		swizzle(inst->I.SrcReg[0], RC_SWIZZLE_Z, RC_SWIZZLE_X, RC_SWIZZLE_Y, RC_SWIZZLE_W),
-		swizzle(inst->I.SrcReg[1], RC_SWIZZLE_Y, RC_SWIZZLE_Z, RC_SWIZZLE_X, RC_SWIZZLE_W));
-	emit3(c, inst->Prev, RC_OPCODE_MAD, inst->I.SaturateMode, inst->I.DstReg,
-		swizzle(inst->I.SrcReg[0], RC_SWIZZLE_Y, RC_SWIZZLE_Z, RC_SWIZZLE_X, RC_SWIZZLE_W),
-		swizzle(inst->I.SrcReg[1], RC_SWIZZLE_Z, RC_SWIZZLE_X, RC_SWIZZLE_Y, RC_SWIZZLE_W),
+		swizzle(inst->U.I.SrcReg[0], RC_SWIZZLE_Z, RC_SWIZZLE_X, RC_SWIZZLE_Y, RC_SWIZZLE_W),
+		swizzle(inst->U.I.SrcReg[1], RC_SWIZZLE_Y, RC_SWIZZLE_Z, RC_SWIZZLE_X, RC_SWIZZLE_W));
+	emit3(c, inst->Prev, RC_OPCODE_MAD, inst->U.I.SaturateMode, inst->U.I.DstReg,
+		swizzle(inst->U.I.SrcReg[0], RC_SWIZZLE_Y, RC_SWIZZLE_Z, RC_SWIZZLE_X, RC_SWIZZLE_W),
+		swizzle(inst->U.I.SrcReg[1], RC_SWIZZLE_Z, RC_SWIZZLE_X, RC_SWIZZLE_Y, RC_SWIZZLE_W),
 		negate(srcreg(RC_FILE_TEMPORARY, tempreg)));
 
 	rc_remove_instruction(inst);
@@ -417,7 +417,7 @@ int radeonTransformALU(
 	struct rc_instruction* inst,
 	void* unused)
 {
-	switch(inst->I.Opcode) {
+	switch(inst->U.I.Opcode) {
 	case RC_OPCODE_ABS: transform_ABS(c, inst); return 1;
 	case RC_OPCODE_DPH: transform_DPH(c, inst); return 1;
 	case RC_OPCODE_DST: transform_DST(c, inst); return 1;
@@ -441,9 +441,9 @@ static void transform_r300_vertex_ABS(struct radeon_compiler* c,
 	struct rc_instruction* inst)
 {
 	/* Note: r500 can take absolute values, but r300 cannot. */
-	inst->I.Opcode = RC_OPCODE_MAX;
-	inst->I.SrcReg[1] = inst->I.SrcReg[0];
-	inst->I.SrcReg[1].Negate ^= RC_MASK_XYZW;
+	inst->U.I.Opcode = RC_OPCODE_MAX;
+	inst->U.I.SrcReg[1] = inst->U.I.SrcReg[0];
+	inst->U.I.SrcReg[1].Negate ^= RC_MASK_XYZW;
 }
 
 /**
@@ -455,7 +455,7 @@ int r300_transform_vertex_alu(
 	struct rc_instruction* inst,
 	void* unused)
 {
-	switch(inst->I.Opcode) {
+	switch(inst->U.I.Opcode) {
 	case RC_OPCODE_ABS: transform_r300_vertex_ABS(c, inst); return 1;
 	case RC_OPCODE_DP3: transform_DP3(c, inst); return 1;
 	case RC_OPCODE_DPH: transform_DPH(c, inst); return 1;
@@ -531,9 +531,9 @@ int radeonTransformTrigSimple(struct radeon_compiler* c,
 	struct rc_instruction* inst,
 	void* unused)
 {
-	if (inst->I.Opcode != RC_OPCODE_COS &&
-	    inst->I.Opcode != RC_OPCODE_SIN &&
-	    inst->I.Opcode != RC_OPCODE_SCS)
+	if (inst->U.I.Opcode != RC_OPCODE_COS &&
+	    inst->U.I.Opcode != RC_OPCODE_SIN &&
+	    inst->U.I.Opcode != RC_OPCODE_SCS)
 		return 0;
 
 	unsigned int constants[2];
@@ -541,12 +541,12 @@ int radeonTransformTrigSimple(struct radeon_compiler* c,
 
 	sincos_constants(c, constants);
 
-	if (inst->I.Opcode == RC_OPCODE_COS) {
+	if (inst->U.I.Opcode == RC_OPCODE_COS) {
 		// MAD tmp.x, src, 1/(2*PI), 0.75
 		// FRC tmp.x, tmp.x
 		// MAD tmp.z, tmp.x, 2*PI, -PI
 		emit3(c, inst->Prev, RC_OPCODE_MAD, 0, dstregtmpmask(tempreg, RC_MASK_W),
-			swizzle(inst->I.SrcReg[0], RC_SWIZZLE_X, RC_SWIZZLE_X, RC_SWIZZLE_X, RC_SWIZZLE_X),
+			swizzle(inst->U.I.SrcReg[0], RC_SWIZZLE_X, RC_SWIZZLE_X, RC_SWIZZLE_X, RC_SWIZZLE_X),
 			swizzle(srcreg(RC_FILE_CONSTANT, constants[1]), RC_SWIZZLE_Z, RC_SWIZZLE_Z, RC_SWIZZLE_Z, RC_SWIZZLE_Z),
 			swizzle(srcreg(RC_FILE_CONSTANT, constants[1]), RC_SWIZZLE_X, RC_SWIZZLE_X, RC_SWIZZLE_X, RC_SWIZZLE_X));
 		emit1(c, inst->Prev, RC_OPCODE_FRC, 0, dstregtmpmask(tempreg, RC_MASK_W),
@@ -556,12 +556,12 @@ int radeonTransformTrigSimple(struct radeon_compiler* c,
 			swizzle(srcreg(RC_FILE_CONSTANT, constants[1]), RC_SWIZZLE_W, RC_SWIZZLE_W, RC_SWIZZLE_W, RC_SWIZZLE_W),
 			negate(swizzle(srcreg(RC_FILE_CONSTANT, constants[0]), RC_SWIZZLE_Z, RC_SWIZZLE_Z, RC_SWIZZLE_Z, RC_SWIZZLE_Z)));
 
-		sin_approx(c, inst, inst->I.DstReg,
+		sin_approx(c, inst, inst->U.I.DstReg,
 			swizzle(srcreg(RC_FILE_TEMPORARY, tempreg), RC_SWIZZLE_W, RC_SWIZZLE_W, RC_SWIZZLE_W, RC_SWIZZLE_W),
 			constants);
-	} else if (inst->I.Opcode == RC_OPCODE_SIN) {
+	} else if (inst->U.I.Opcode == RC_OPCODE_SIN) {
 		emit3(c, inst->Prev, RC_OPCODE_MAD, 0, dstregtmpmask(tempreg, RC_MASK_W),
-			swizzle(inst->I.SrcReg[0], RC_SWIZZLE_X, RC_SWIZZLE_X, RC_SWIZZLE_X, RC_SWIZZLE_X),
+			swizzle(inst->U.I.SrcReg[0], RC_SWIZZLE_X, RC_SWIZZLE_X, RC_SWIZZLE_X, RC_SWIZZLE_X),
 			swizzle(srcreg(RC_FILE_CONSTANT, constants[1]), RC_SWIZZLE_Z, RC_SWIZZLE_Z, RC_SWIZZLE_Z, RC_SWIZZLE_Z),
 			swizzle(srcreg(RC_FILE_CONSTANT, constants[1]), RC_SWIZZLE_Y, RC_SWIZZLE_Y, RC_SWIZZLE_Y, RC_SWIZZLE_Y));
 		emit1(c, inst->Prev, RC_OPCODE_FRC, 0, dstregtmpmask(tempreg, RC_MASK_W),
@@ -571,12 +571,12 @@ int radeonTransformTrigSimple(struct radeon_compiler* c,
 			swizzle(srcreg(RC_FILE_CONSTANT, constants[1]), RC_SWIZZLE_W, RC_SWIZZLE_W, RC_SWIZZLE_W, RC_SWIZZLE_W),
 			negate(swizzle(srcreg(RC_FILE_CONSTANT, constants[0]), RC_SWIZZLE_Z, RC_SWIZZLE_Z, RC_SWIZZLE_Z, RC_SWIZZLE_Z)));
 
-		sin_approx(c, inst, inst->I.DstReg,
+		sin_approx(c, inst, inst->U.I.DstReg,
 			swizzle(srcreg(RC_FILE_TEMPORARY, tempreg), RC_SWIZZLE_W, RC_SWIZZLE_W, RC_SWIZZLE_W, RC_SWIZZLE_W),
 			constants);
 	} else {
 		emit3(c, inst->Prev, RC_OPCODE_MAD, 0, dstregtmpmask(tempreg, RC_MASK_XY),
-			swizzle(inst->I.SrcReg[0], RC_SWIZZLE_X, RC_SWIZZLE_X, RC_SWIZZLE_X, RC_SWIZZLE_X),
+			swizzle(inst->U.I.SrcReg[0], RC_SWIZZLE_X, RC_SWIZZLE_X, RC_SWIZZLE_X, RC_SWIZZLE_X),
 			swizzle(srcreg(RC_FILE_CONSTANT, constants[1]), RC_SWIZZLE_Z, RC_SWIZZLE_Z, RC_SWIZZLE_Z, RC_SWIZZLE_Z),
 			swizzle(srcreg(RC_FILE_CONSTANT, constants[1]), RC_SWIZZLE_X, RC_SWIZZLE_Y, RC_SWIZZLE_Z, RC_SWIZZLE_W));
 		emit1(c, inst->Prev, RC_OPCODE_FRC, 0, dstregtmpmask(tempreg, RC_MASK_XY),
@@ -586,14 +586,14 @@ int radeonTransformTrigSimple(struct radeon_compiler* c,
 			swizzle(srcreg(RC_FILE_CONSTANT, constants[1]), RC_SWIZZLE_W, RC_SWIZZLE_W, RC_SWIZZLE_W, RC_SWIZZLE_W),
 			negate(swizzle(srcreg(RC_FILE_CONSTANT, constants[0]), RC_SWIZZLE_Z, RC_SWIZZLE_Z, RC_SWIZZLE_Z, RC_SWIZZLE_Z)));
 
-		struct rc_dst_register dst = inst->I.DstReg;
+		struct rc_dst_register dst = inst->U.I.DstReg;
 
-		dst.WriteMask = inst->I.DstReg.WriteMask & RC_MASK_X;
+		dst.WriteMask = inst->U.I.DstReg.WriteMask & RC_MASK_X;
 		sin_approx(c, inst, dst,
 			swizzle(srcreg(RC_FILE_TEMPORARY, tempreg), RC_SWIZZLE_X, RC_SWIZZLE_X, RC_SWIZZLE_X, RC_SWIZZLE_X),
 			constants);
 
-		dst.WriteMask = inst->I.DstReg.WriteMask & RC_MASK_Y;
+		dst.WriteMask = inst->U.I.DstReg.WriteMask & RC_MASK_Y;
 		sin_approx(c, inst, dst,
 			swizzle(srcreg(RC_FILE_TEMPORARY, tempreg), RC_SWIZZLE_Y, RC_SWIZZLE_Y, RC_SWIZZLE_Y, RC_SWIZZLE_Y),
 			constants);
@@ -617,9 +617,9 @@ int radeonTransformTrigScale(struct radeon_compiler* c,
 	struct rc_instruction* inst,
 	void* unused)
 {
-	if (inst->I.Opcode != RC_OPCODE_COS &&
-	    inst->I.Opcode != RC_OPCODE_SIN &&
-	    inst->I.Opcode != RC_OPCODE_SCS)
+	if (inst->U.I.Opcode != RC_OPCODE_COS &&
+	    inst->U.I.Opcode != RC_OPCODE_SIN &&
+	    inst->U.I.Opcode != RC_OPCODE_SCS)
 		return 0;
 
 	static const float RCP_2PI = 0.15915494309189535;
@@ -631,28 +631,28 @@ int radeonTransformTrigScale(struct radeon_compiler* c,
 	constant = rc_constants_add_immediate_scalar(&c->Program.Constants, RCP_2PI, &constant_swizzle);
 
 	emit2(c, inst->Prev, RC_OPCODE_MUL, 0, dstregtmpmask(temp, RC_MASK_W),
-		swizzle(inst->I.SrcReg[0], RC_SWIZZLE_X, RC_SWIZZLE_X, RC_SWIZZLE_X, RC_SWIZZLE_X),
+		swizzle(inst->U.I.SrcReg[0], RC_SWIZZLE_X, RC_SWIZZLE_X, RC_SWIZZLE_X, RC_SWIZZLE_X),
 		srcregswz(RC_FILE_CONSTANT, constant, constant_swizzle));
 	emit1(c, inst->Prev, RC_OPCODE_FRC, 0, dstregtmpmask(temp, RC_MASK_W),
 		srcreg(RC_FILE_TEMPORARY, temp));
 
-	if (inst->I.Opcode == RC_OPCODE_COS) {
-		emit1(c, inst->Prev, RC_OPCODE_COS, inst->I.SaturateMode, inst->I.DstReg,
+	if (inst->U.I.Opcode == RC_OPCODE_COS) {
+		emit1(c, inst->Prev, RC_OPCODE_COS, inst->U.I.SaturateMode, inst->U.I.DstReg,
 			srcregswz(RC_FILE_TEMPORARY, temp, RC_SWIZZLE_WWWW));
-	} else if (inst->I.Opcode == RC_OPCODE_SIN) {
-		emit1(c, inst->Prev, RC_OPCODE_SIN, inst->I.SaturateMode,
-			inst->I.DstReg, srcregswz(RC_FILE_TEMPORARY, temp, RC_SWIZZLE_WWWW));
-	} else if (inst->I.Opcode == RC_OPCODE_SCS) {
-		struct rc_dst_register moddst = inst->I.DstReg;
+	} else if (inst->U.I.Opcode == RC_OPCODE_SIN) {
+		emit1(c, inst->Prev, RC_OPCODE_SIN, inst->U.I.SaturateMode,
+			inst->U.I.DstReg, srcregswz(RC_FILE_TEMPORARY, temp, RC_SWIZZLE_WWWW));
+	} else if (inst->U.I.Opcode == RC_OPCODE_SCS) {
+		struct rc_dst_register moddst = inst->U.I.DstReg;
 
-		if (inst->I.DstReg.WriteMask & RC_MASK_X) {
+		if (inst->U.I.DstReg.WriteMask & RC_MASK_X) {
 			moddst.WriteMask = RC_MASK_X;
-			emit1(c, inst->Prev, RC_OPCODE_COS, inst->I.SaturateMode, moddst,
+			emit1(c, inst->Prev, RC_OPCODE_COS, inst->U.I.SaturateMode, moddst,
 				srcregswz(RC_FILE_TEMPORARY, temp, RC_SWIZZLE_WWWW));
 		}
-		if (inst->I.DstReg.WriteMask & RC_MASK_Y) {
+		if (inst->U.I.DstReg.WriteMask & RC_MASK_Y) {
 			moddst.WriteMask = RC_MASK_Y;
-			emit1(c, inst->Prev, RC_OPCODE_SIN, inst->I.SaturateMode, moddst,
+			emit1(c, inst->Prev, RC_OPCODE_SIN, inst->U.I.SaturateMode, moddst,
 				srcregswz(RC_FILE_TEMPORARY, temp, RC_SWIZZLE_WWWW));
 		}
 	}
@@ -674,11 +674,11 @@ int radeonTransformDeriv(struct radeon_compiler* c,
 	struct rc_instruction* inst,
 	void* unused)
 {
-	if (inst->I.Opcode != RC_OPCODE_DDX && inst->I.Opcode != RC_OPCODE_DDY)
+	if (inst->U.I.Opcode != RC_OPCODE_DDX && inst->U.I.Opcode != RC_OPCODE_DDY)
 		return 0;
 
-	inst->I.SrcReg[1].Swizzle = RC_MAKE_SWIZZLE(RC_SWIZZLE_ONE, RC_SWIZZLE_ONE, RC_SWIZZLE_ONE, RC_SWIZZLE_ONE);
-	inst->I.SrcReg[1].Negate = RC_MASK_XYZW;
+	inst->U.I.SrcReg[1].Swizzle = RC_MAKE_SWIZZLE(RC_SWIZZLE_ONE, RC_SWIZZLE_ONE, RC_SWIZZLE_ONE, RC_SWIZZLE_ONE);
+	inst->U.I.SrcReg[1].Negate = RC_MASK_XYZW;
 
 	return 1;
 }
diff --git a/src/mesa/drivers/dri/r300/compiler/radeon_program_pair.c b/src/mesa/drivers/dri/r300/compiler/radeon_program_pair.c
index 6cda208600..0d8d8e0b3b 100644
--- a/src/mesa/drivers/dri/r300/compiler/radeon_program_pair.c
+++ b/src/mesa/drivers/dri/r300/compiler/radeon_program_pair.c
@@ -341,7 +341,7 @@ static void scan_instructions(struct pair_state *s)
 		struct pair_state_instruction *pairinst = memory_pool_malloc(&s->Compiler->Base.Pool, sizeof(*pairinst));
 		memset(pairinst, 0, sizeof(struct pair_state_instruction));
 
-		pairinst->Instruction = source->I;
+		pairinst->Instruction = source->U.I;
 		pairinst->IP = ip;
 		final_rewrite(s, &pairinst->Instruction);
 		classify_instruction(s, pairinst);
diff --git a/src/mesa/drivers/dri/r300/compiler/radeon_program_pair.h b/src/mesa/drivers/dri/r300/compiler/radeon_program_pair.h
index da2bcc5d89..440069d558 100644
--- a/src/mesa/drivers/dri/r300/compiler/radeon_program_pair.h
+++ b/src/mesa/drivers/dri/r300/compiler/radeon_program_pair.h
@@ -28,8 +28,6 @@
 #ifndef __RADEON_PROGRAM_PAIR_H_
 #define __RADEON_PROGRAM_PAIR_H_
 
-#include "radeon_program.h"
-
 struct r300_fragment_program_compiler;
 
 
diff --git a/src/mesa/drivers/dri/r300/compiler/radeon_program_print.c b/src/mesa/drivers/dri/r300/compiler/radeon_program_print.c
index 6645d7cacb..fe90a5900e 100644
--- a/src/mesa/drivers/dri/r300/compiler/radeon_program_print.c
+++ b/src/mesa/drivers/dri/r300/compiler/radeon_program_print.c
@@ -144,12 +144,12 @@ static void rc_print_src_register(FILE * f, struct rc_src_register src)
 
 static void rc_print_instruction(FILE * f, struct rc_instruction * inst)
 {
-	const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->I.Opcode);
+	const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->U.I.Opcode);
 	unsigned int reg;
 
 	fprintf(f, "%s", opcode->Name);
 
-	switch(inst->I.SaturateMode) {
+	switch(inst->U.I.SaturateMode) {
 	case RC_SATURATE_NONE: break;
 	case RC_SATURATE_ZERO_ONE: fprintf(f, "_SAT"); break;
 	case RC_SATURATE_MINUS_PLUS_ONE: fprintf(f, "_SAT2"); break;
@@ -158,7 +158,7 @@ static void rc_print_instruction(FILE * f, struct rc_instruction * inst)
 
 	if (opcode->HasDstReg) {
 		fprintf(f, " ");
-		rc_print_dst_register(f, inst->I.DstReg);
+		rc_print_dst_register(f, inst->U.I.DstReg);
 		if (opcode->NumSrcRegs)
 			fprintf(f, ",");
 	}
@@ -167,23 +167,23 @@ static void rc_print_instruction(FILE * f, struct rc_instruction * inst)
 		if (reg > 0)
 			fprintf(f, ",");
 		fprintf(f, " ");
-		rc_print_src_register(f, inst->I.SrcReg[reg]);
+		rc_print_src_register(f, inst->U.I.SrcReg[reg]);
 	}
 
 	if (opcode->HasTexture) {
 		fprintf(f, ", %s%s[%u]",
-			textarget_to_string(inst->I.TexSrcTarget),
-			inst->I.TexShadow ? "SHADOW" : "",
-			inst->I.TexSrcUnit);
+			textarget_to_string(inst->U.I.TexSrcTarget),
+			inst->U.I.TexShadow ? "SHADOW" : "",
+			inst->U.I.TexSrcUnit);
 	}
 
 	fprintf(f, ";");
 
-	if (inst->I.WriteALUResult) {
+	if (inst->U.I.WriteALUResult) {
 		fprintf(f, " [aluresult = (");
 		rc_print_comparefunc(f,
-			(inst->I.WriteALUResult == RC_ALURESULT_X) ? "x" : "w",
-			inst->I.ALUResultCompare, "0");
+			(inst->U.I.WriteALUResult == RC_ALURESULT_X) ? "x" : "w",
+			inst->U.I.ALUResultCompare, "0");
 		fprintf(f, ")]");
 	}
 
diff --git a/src/mesa/drivers/dri/r300/r300_vertprog.c b/src/mesa/drivers/dri/r300/r300_vertprog.c
index fb8d6bceda..43629d643b 100644
--- a/src/mesa/drivers/dri/r300/r300_vertprog.c
+++ b/src/mesa/drivers/dri/r300/r300_vertprog.c
@@ -217,20 +217,20 @@ static void initialize_NV_registers(struct radeon_compiler * compiler)
 
 	for(reg = 0; reg < 12; ++reg) {
 		inst = rc_insert_new_instruction(compiler, &compiler->Program.Instructions);
-		inst->I.Opcode = RC_OPCODE_MOV;
-		inst->I.DstReg.File = RC_FILE_TEMPORARY;
-		inst->I.DstReg.Index = reg;
-		inst->I.SrcReg[0].File = RC_FILE_NONE;
-		inst->I.SrcReg[0].Swizzle = RC_SWIZZLE_0000;
+		inst->U.I.Opcode = RC_OPCODE_MOV;
+		inst->U.I.DstReg.File = RC_FILE_TEMPORARY;
+		inst->U.I.DstReg.Index = reg;
+		inst->U.I.SrcReg[0].File = RC_FILE_NONE;
+		inst->U.I.SrcReg[0].Swizzle = RC_SWIZZLE_0000;
 	}
 
 	inst = rc_insert_new_instruction(compiler, &compiler->Program.Instructions);
-	inst->I.Opcode = RC_OPCODE_ARL;
-	inst->I.DstReg.File = RC_FILE_ADDRESS;
-	inst->I.DstReg.Index = 0;
-	inst->I.DstReg.WriteMask = WRITEMASK_X;
-	inst->I.SrcReg[0].File = RC_FILE_NONE;
-	inst->I.SrcReg[0].Swizzle = RC_SWIZZLE_0000;
+	inst->U.I.Opcode = RC_OPCODE_ARL;
+	inst->U.I.DstReg.File = RC_FILE_ADDRESS;
+	inst->U.I.DstReg.Index = 0;
+	inst->U.I.DstReg.WriteMask = WRITEMASK_X;
+	inst->U.I.SrcReg[0].File = RC_FILE_NONE;
+	inst->U.I.SrcReg[0].Swizzle = RC_SWIZZLE_0000;
 }
 
 static struct r300_vertex_program *build_program(GLcontext *ctx,
diff --git a/src/mesa/drivers/dri/r300/radeon_mesa_to_rc.c b/src/mesa/drivers/dri/r300/radeon_mesa_to_rc.c
index fb9bb9ce91..9f9dec840b 100644
--- a/src/mesa/drivers/dri/r300/radeon_mesa_to_rc.c
+++ b/src/mesa/drivers/dri/r300/radeon_mesa_to_rc.c
@@ -152,25 +152,25 @@ static void translate_instruction(struct radeon_compiler * c,
 	const struct rc_opcode_info * opcode;
 	unsigned int i;
 
-	dest->I.Opcode = translate_opcode(src->Opcode);
-	if (dest->I.Opcode == RC_OPCODE_ILLEGAL_OPCODE) {
+	dest->U.I.Opcode = translate_opcode(src->Opcode);
+	if (dest->U.I.Opcode == RC_OPCODE_ILLEGAL_OPCODE) {
 		rc_error(c, "Unsupported opcode %i\n", src->Opcode);
 		return;
 	}
-	dest->I.SaturateMode = translate_saturate(src->SaturateMode);
+	dest->U.I.SaturateMode = translate_saturate(src->SaturateMode);
 
-	opcode = rc_get_opcode_info(dest->I.Opcode);
+	opcode = rc_get_opcode_info(dest->U.I.Opcode);
 
 	for(i = 0; i < opcode->NumSrcRegs; ++i)
-		translate_srcreg(&dest->I.SrcReg[i], &src->SrcReg[i]);
+		translate_srcreg(&dest->U.I.SrcReg[i], &src->SrcReg[i]);
 
 	if (opcode->HasDstReg)
-		translate_dstreg(&dest->I.DstReg, &src->DstReg);
+		translate_dstreg(&dest->U.I.DstReg, &src->DstReg);
 
 	if (opcode->HasTexture) {
-		dest->I.TexSrcUnit = src->TexSrcUnit;
-		dest->I.TexSrcTarget = translate_tex_target(src->TexSrcTarget);
-		dest->I.TexShadow = src->TexShadow;
+		dest->U.I.TexSrcUnit = src->TexSrcUnit;
+		dest->U.I.TexSrcTarget = translate_tex_target(src->TexSrcTarget);
+		dest->U.I.TexShadow = src->TexShadow;
 	}
 }