Mesa (master): r300/compiler: Fix dataflow bug in presub_helper()

[Tom Stellard]

Module: Mesa
Branch: master
Commit: e3fc210a4f93c41cd3d1601dd1c937388f117d97
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=e3fc210a4f93c41cd3d1601dd1c937388f117d97

Author: Tom Stellard <tstellar at gmail.com>
Date:   Tue Sep  7 10:22:16 2010 -0700

r300/compiler: Fix dataflow bug in presub_helper()

---

 .../drivers/dri/r300/compiler/radeon_optimize.c    |    2 ++
 1 files changed, 2 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 53efbba..88aac94 100644
--- a/src/mesa/drivers/dri/r300/compiler/radeon_optimize.c
+++ b/src/mesa/drivers/dri/r300/compiler/radeon_optimize.c
@@ -590,6 +590,8 @@ static int presub_helper(
 		if (inst->U.I.DstReg.WriteMask &
 				src_reads_dst_mask(s->Inst->U.I.SrcReg[1],
 							inst->U.I.DstReg)
+				|| src_reads_dst_mask(s->Inst->U.I.SrcReg[0],
+							inst->U.I.DstReg)
 				|| info->IsFlowControl) {
 			cant_sub = 1;
 		}