Allows us to transform
mad res src0 src1 src2
mov.sat dst -res
into
mad.sat dst -src0 -src1 src2
instructions in affected programs: 3712 -> 3688 (-0.65%)
helped: 24
---
src/mesa/drivers/dri/i965/brw_fs_saturate_propagation.cpp | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/src/mesa/drivers/dri/i965/brw_fs_saturate_propagation.cpp
b/src/mesa/drivers/dri/i965/brw_fs_saturate_propagation.cpp
index 7c82509..dc2b0c8 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_saturate_propagation.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_saturate_propagation.cpp
@@ -86,6 +86,10 @@ opt_saturate_propagation_local(fs_visitor *v, bblock_t
*block)
if (scan_inst->opcode == BRW_OPCODE_MUL) {
scan_inst->src[0].negate = !scan_inst->src[0].negate;
inst->src[0].negate = false;
+ } else if (scan_inst->opcode == BRW_OPCODE_MAD) {
+ scan_inst->src[0].negate = !scan_inst->src[0].negate;
+ scan_inst->src[1].negate = !scan_inst->src[1].negate;
+ inst->src[0].negate = false;
} else if (scan_inst->opcode == BRW_OPCODE_ADD) {
if (scan_inst->src[1].file == IMM) {
if (!brw_negate_immediate(scan_inst->src[1].type,
--
2.4.10
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