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-rw-r--r--src/mesa/drivers/dri/i965/brw_fs.cpp9
-rw-r--r--src/mesa/drivers/dri/i965/brw_vec4.cpp5
2 files changed, 14 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index c7c6accebf6..0f1300c1cc6 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -2325,6 +2325,15 @@ 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 fda8552d841..58828c3f320 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: