Mesa (master): r300/compiler: Don't continue copy propagation inside loops.

[Marek Olšák]

Module: Mesa
Branch: master
Commit: 0dbdcb43215c13dd7d7f83c1f1cdbfe6706109f0
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=0dbdcb43215c13dd7d7f83c1f1cdbfe6706109f0

Author: Tom Stellard <tstellar at gmail.com>
Date:   Fri Jun 18 20:42:33 2010 -0700

r300/compiler: Don't continue copy propagation inside loops.

---

 .../drivers/dri/r300/compiler/radeon_optimize.c    |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/src/mesa/drivers/dri/r300/compiler/radeon_optimize.c b/src/mesa/drivers/dri/r300/compiler/radeon_optimize.c
index e760b59..eca0651 100644
--- a/src/mesa/drivers/dri/r300/compiler/radeon_optimize.c
+++ b/src/mesa/drivers/dri/r300/compiler/radeon_optimize.c
@@ -162,6 +162,11 @@ static void peephole(struct radeon_compiler * c, struct rc_instruction * inst_mo
 	for(struct rc_instruction * inst = inst_mov->Next;
 	    inst != &c->Program.Instructions;
 	    inst = inst->Next) {
+		/* XXX In the future we might be able to make the optimizer
+		 * smart enough to handle loops. */
+		if(inst->U.I.Opcode == RC_OPCODE_BGNLOOP){
+			return;
+		}
 		rc_for_all_reads_mask(inst, peephole_scan_read, &s);
 		rc_for_all_writes_mask(inst, peephole_scan_write, &s);
 		if (s.Conflict)