1 files changed, 284 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/r300/radeon_nqssadce.c b/src/mesa/drivers/dri/r300/radeon_nqssadce.c
new file mode 100644
index 0000000000..97ce016c99
--- /dev/null
+++ b/src/mesa/drivers/dri/r300/radeon_nqssadce.c
@@ -0,0 +1,284 @@
+/*
+ * Copyright (C) 2008 Nicolai Haehnle.
+ *
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial
+ * portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+/**
+ * @file
+ *
+ * "Not-quite SSA" and Dead-Code Elimination.
+ *
+ * @note This code uses SWIZZLE_NIL in a source register to indicate that
+ * the corresponding component is ignored by the corresponding instruction.
+ */
+
+#include "radeon_nqssadce.h"
+
+
+/**
+ * Return the @ref register_state for the given register (or 0 for untracked
+ * registers, i.e. constants).
+ */
+static struct register_state *get_reg_state(struct nqssadce_state* s, GLuint file, GLuint index)
+{
+	switch(file) {
+	case PROGRAM_TEMPORARY: return &s->Temps[index];
+	case PROGRAM_OUTPUT: return &s->Outputs[index];
+	default: return 0;
+	}
+}
+
+
+/**
+ * Left multiplication of a register with a swizzle
+ *
+ * @note Works correctly only for X, Y, Z, W swizzles, not for constant swizzles.
+ */
+static struct prog_src_register lmul_swizzle(GLuint swizzle, struct prog_src_register srcreg)
+{
+	struct prog_src_register tmp = srcreg;
+	int i;
+	tmp.Swizzle = 0;
+	tmp.NegateBase = 0;
+	for(i = 0; i < 4; ++i) {
+		GLuint swz = GET_SWZ(swizzle, i);
+		if (swz < 4) {
+			tmp.Swizzle |= GET_SWZ(srcreg.Swizzle, swz) << (i*3);
+			tmp.NegateBase |= GET_BIT(srcreg.NegateBase, swz) << i;
+		} else {
+			tmp.Swizzle |= swz << (i*3);
+		}
+	}
+	return tmp;
+}
+
+
+static struct prog_instruction* track_used_srcreg(struct nqssadce_state* s,
+	struct prog_instruction *inst, GLint src, GLuint sourced)
+{
+	int i;
+	GLuint deswz_source = 0;
+
+	for(i = 0; i < 4; ++i) {
+		if (GET_BIT(sourced, i)) {
+			GLuint swz = GET_SWZ(inst->SrcReg[src].Swizzle, i);
+			deswz_source |= 1 << swz;
+		} else {
+			inst->SrcReg[src].Swizzle &= ~(7 << (3*i));
+			inst->SrcReg[src].Swizzle |= SWIZZLE_NIL << (3*i);
+		}
+	}
+
+	if (!s->Descr->IsNativeSwizzle(inst->Opcode, inst->SrcReg[src])) {
+		struct prog_dst_register dstreg = inst->DstReg;
+		dstreg.File = PROGRAM_TEMPORARY;
+		dstreg.Index = _mesa_find_free_register(s->Program, PROGRAM_TEMPORARY);
+		dstreg.WriteMask = sourced;
+
+		s->Descr->BuildSwizzle(s, dstreg, inst->SrcReg[src]);
+
+		inst = s->Program->Instructions + s->IP;
+		inst->SrcReg[src].File = PROGRAM_TEMPORARY;
+		inst->SrcReg[src].Index = dstreg.Index;
+		inst->SrcReg[src].Swizzle = 0;
+		inst->SrcReg[src].NegateBase = 0;
+		inst->SrcReg[src].Abs = 0;
+		inst->SrcReg[src].NegateAbs = 0;
+		for(i = 0; i < 4; ++i) {
+			if (GET_BIT(sourced, i))
+				inst->SrcReg[src].Swizzle |= i << (3*i);
+			else
+				inst->SrcReg[src].Swizzle |= SWIZZLE_NIL << (3*i);
+		}
+		deswz_source = sourced;
+	}
+
+	struct register_state *regstate = get_reg_state(s, inst->SrcReg[src].File, inst->SrcReg[src].Index);
+	if (regstate)
+		regstate->Sourced |= deswz_source & 0xf;
+
+	return inst;
+}
+
+
+static void rewrite_depth_out(struct prog_instruction *inst)
+{
+	if (inst->DstReg.WriteMask & WRITEMASK_Z) {
+		inst->DstReg.WriteMask = WRITEMASK_W;
+	} else {
+		inst->DstReg.WriteMask = 0;
+		return;
+	}
+
+	switch (inst->Opcode) {
+	case OPCODE_FRC:
+	case OPCODE_MOV:
+		inst->SrcReg[0] = lmul_swizzle(SWIZZLE_ZZZZ, inst->SrcReg[0]);
+		break;
+	case OPCODE_ADD:
+	case OPCODE_MAX:
+	case OPCODE_MIN:
+	case OPCODE_MUL:
+		inst->SrcReg[0] = lmul_swizzle(SWIZZLE_ZZZZ, inst->SrcReg[0]);
+		inst->SrcReg[1] = lmul_swizzle(SWIZZLE_ZZZZ, inst->SrcReg[1]);
+		break;
+	case OPCODE_CMP:
+	case OPCODE_MAD:
+		inst->SrcReg[0] = lmul_swizzle(SWIZZLE_ZZZZ, inst->SrcReg[0]);
+		inst->SrcReg[1] = lmul_swizzle(SWIZZLE_ZZZZ, inst->SrcReg[1]);
+		inst->SrcReg[2] = lmul_swizzle(SWIZZLE_ZZZZ, inst->SrcReg[2]);
+		break;
+	default:
+		// Scalar instructions needn't be reswizzled
+		break;
+	}
+}
+
+static void unalias_srcregs(struct prog_instruction *inst, GLuint oldindex, GLuint newindex)
+{
+	int nsrc = _mesa_num_inst_src_regs(inst->Opcode);
+	int i;
+	for(i = 0; i < nsrc; ++i)
+		if (inst->SrcReg[i].File == PROGRAM_TEMPORARY && inst->SrcReg[i].Index == oldindex)
+			inst->SrcReg[i].Index = newindex;
+}
+
+static void unalias_temporary(struct nqssadce_state* s, GLuint oldindex)
+{
+	GLuint newindex = _mesa_find_free_register(s->Program, PROGRAM_TEMPORARY);
+	int ip;
+	for(ip = 0; ip < s->IP; ++ip) {
+		struct prog_instruction* inst = s->Program->Instructions + ip;
+		if (inst->DstReg.File == PROGRAM_TEMPORARY && inst->DstReg.Index == oldindex)
+			inst->DstReg.Index = newindex;
+		unalias_srcregs(inst, oldindex, newindex);
+	}
+	unalias_srcregs(s->Program->Instructions + s->IP, oldindex, newindex);
+}
+
+
+/**
+ * Handle one instruction.
+ */
+static void process_instruction(struct nqssadce_state* s)
+{
+	struct prog_instruction *inst = s->Program->Instructions + s->IP;
+
+	if (inst->Opcode == OPCODE_END)
+		return;
+
+	if (inst->Opcode != OPCODE_KIL) {
+		if (s->Descr->RewriteDepthOut) {
+			if (inst->DstReg.File == PROGRAM_OUTPUT && inst->DstReg.Index == FRAG_RESULT_DEPR)
+				rewrite_depth_out(inst);
+		}
+
+		struct register_state *regstate = get_reg_state(s, inst->DstReg.File, inst->DstReg.Index);
+		if (!regstate) {
+			_mesa_problem(s->Ctx, "NqssaDce: bad destination register (%i[%i])\n",
+				inst->DstReg.File, inst->DstReg.Index);
+			return;
+		}
+
+		inst->DstReg.WriteMask &= regstate->Sourced;
+		regstate->Sourced &= ~inst->DstReg.WriteMask;
+
+		if (inst->DstReg.WriteMask == 0) {
+			_mesa_delete_instructions(s->Program, s->IP, 1);
+			return;
+		}
+
+		if (inst->DstReg.File == PROGRAM_TEMPORARY && !regstate->Sourced)
+			unalias_temporary(s, inst->DstReg.Index);
+	}
+
+	/* Attention: Due to swizzle emulation code, the following
+	 * might change the instruction stream under us, so we have
+	 * to be careful with the inst pointer. */
+	switch (inst->Opcode) {
+	case OPCODE_DDX:
+	case OPCODE_DDY:
+	case OPCODE_FRC:
+	case OPCODE_MOV:
+		inst = track_used_srcreg(s, inst, 0, inst->DstReg.WriteMask);
+		break;
+	case OPCODE_ADD:
+	case OPCODE_MAX:
+	case OPCODE_MIN:
+	case OPCODE_MUL:
+		inst = track_used_srcreg(s, inst, 0, inst->DstReg.WriteMask);
+		inst = track_used_srcreg(s, inst, 1, inst->DstReg.WriteMask);
+		break;
+	case OPCODE_CMP:
+	case OPCODE_MAD:
+		inst = track_used_srcreg(s, inst, 0, inst->DstReg.WriteMask);
+		inst = track_used_srcreg(s, inst, 1, inst->DstReg.WriteMask);
+		inst = track_used_srcreg(s, inst, 2, inst->DstReg.WriteMask);
+		break;
+	case OPCODE_COS:
+	case OPCODE_EX2:
+	case OPCODE_LG2:
+	case OPCODE_RCP:
+	case OPCODE_RSQ:
+	case OPCODE_SIN:
+		inst = track_used_srcreg(s, inst, 0, 0x1);
+		break;
+	case OPCODE_DP3:
+		inst = track_used_srcreg(s, inst, 0, 0x7);
+		inst = track_used_srcreg(s, inst, 1, 0x7);
+		break;
+	case OPCODE_DP4:
+		inst = track_used_srcreg(s, inst, 0, 0xf);
+		inst = track_used_srcreg(s, inst, 1, 0xf);
+		break;
+	case OPCODE_KIL:
+	case OPCODE_TEX:
+	case OPCODE_TXB:
+	case OPCODE_TXP:
+		inst = track_used_srcreg(s, inst, 0, 0xf);
+		break;
+	default:
+		_mesa_problem(s->Ctx, "NqssaDce: Unknown opcode %d\n", inst->Opcode);
+		return;
+	}
+}
+
+
+void radeonNqssaDce(GLcontext *ctx, struct gl_program *p, struct radeon_nqssadce_descr* descr)
+{
+	struct nqssadce_state s;
+
+	_mesa_bzero(&s, sizeof(s));
+	s.Ctx = ctx;
+	s.Program = p;
+	s.Descr = descr;
+	s.Descr->Init(&s);
+	s.IP = p->NumInstructions;
+
+	while(s.IP > 0) {
+		s.IP--;
+		process_instruction(&s);
+	}
+}