From 6c88f84bddf4b61f8306c5e0eb48642cb636bd58 Mon Sep 17 00:00:00 2001
From: Marek Olšák <maraeo@gmail.com>
Date: Sun, 22 Aug 2010 03:29:54 +0200
Subject: r300/compiler: handle indexable temporaries correctly in deadcode
 elimination

---
 .../dri/r300/compiler/radeon_dataflow_deadcode.c   | 31 +++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

(limited to 'src/mesa/drivers')

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 faf531b412..acdb371de9 100644
--- a/src/mesa/drivers/dri/r300/compiler/radeon_dataflow_deadcode.c
+++ b/src/mesa/drivers/dri/r300/compiler/radeon_dataflow_deadcode.c
@@ -157,8 +157,12 @@ static void update_instruction(struct deadcode_state * s, struct rc_instruction
 		unsigned char * pused = get_used_ptr(s, inst->U.I.DstReg.File, inst->U.I.DstReg.Index);
 		if (pused) {
 			usedmask = *pused & inst->U.I.DstReg.WriteMask;
-			*pused &= ~usedmask;
+			if (!inst->U.I.DstReg.RelAddr)
+				*pused &= ~usedmask;
 		}
+
+		if (inst->U.I.DstReg.RelAddr)
+			mark_used(s, RC_FILE_ADDRESS, 0, RC_MASK_X);
 	}
 
 	insts->WriteMask |= usedmask;
@@ -213,6 +217,7 @@ void rc_dataflow_deadcode(struct radeon_compiler * c, rc_dataflow_mark_outputs_f
 {
 	struct deadcode_state s;
 	unsigned int nr_instructions;
+	unsigned has_temp_reladdr_src = 0;
 
 	memset(&s, 0, sizeof(s));
 	s.C = c;
@@ -300,6 +305,30 @@ void rc_dataflow_deadcode(struct radeon_compiler * c, rc_dataflow_mark_outputs_f
 					rc_error(c, "%s: Unhandled control flow instruction %s\n", __FUNCTION__, opcode->Name);
 				}
 			}
+
+			if (!has_temp_reladdr_src) {
+				for (unsigned i = 0; i < opcode->NumSrcRegs; i++) {
+					if (inst->U.I.SrcReg[i].File == RC_FILE_TEMPORARY &&
+					    inst->U.I.SrcReg[i].RelAddr) {
+						/* If there is a register read from a temporary file with relative addressing,
+						 * mark all preceding written registers as used. */
+						for (struct rc_instruction *ptr = inst->Prev;
+						     ptr != &c->Program.Instructions;
+						     ptr = ptr->Prev) {
+							if (opcode->HasDstReg &&
+							    ptr->U.I.DstReg.File == RC_FILE_TEMPORARY &&
+							    ptr->U.I.DstReg.WriteMask) {
+								mark_used(&s,
+									  ptr->U.I.DstReg.File,
+									  ptr->U.I.DstReg.Index,
+									  ptr->U.I.DstReg.WriteMask);
+							}
+						}
+
+						has_temp_reladdr_src = 1;
+					}
+				}
+			}
 		}
 
 		update_instruction(&s, inst);
-- 
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