instructions in affected programs: 968 -> 942 (-2.69%)
helped: 4
---
src/mesa/drivers/dri/i965/brw_fs.cpp | 9 +++++++++
src/mesa/drivers/dri/i965/brw_vec4.cpp | 5 +++++
2 files changed, 14 insertions(+)
diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp
b/src/mesa/drivers/dri/i965/brw_fs.cpp
index e74a22e..988e36a 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -2335,6 +2335,15 @@ fs_visitor::opt_algebraic()
break;
}
+ /* a * -1.0 = -a */
+ if (inst->src[1].is_negative_one()) {
+ inst->opcode = BRW_OPCODE_MOV;
+ inst->src[0].negate = !inst->src[0].negate;
+ inst->src[1] = reg_undef;
+ progress = true;
+ break;
+ }
+
/* a * 0.0 = 0.0 */
if (inst->src[1].is_zero()) {
inst->opcode = BRW_OPCODE_MOV;
diff --git a/src/mesa/drivers/dri/i965/brw_vec4.cpp
b/src/mesa/drivers/dri/i965/brw_vec4.cpp
index ee74052..7868465 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4.cpp
@@ -725,6 +725,11 @@ vec4_visitor::opt_algebraic()
inst->opcode = BRW_OPCODE_MOV;
inst->src[1] = src_reg();
progress = true;
+ } else if (inst->src[1].is_negative_one()) {
+ inst->opcode = BRW_OPCODE_MOV;
+ inst->src[0].negate = !inst->src[0].negate;
+ inst->src[1] = src_reg();
+ progress = true;
}
break;
case BRW_OPCODE_CMP:
--
2.0.5
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