Removes unnecessary MOV instructions in L4D2, TF2, Dota2, and many other
Steam games.
total instructions in shared programs: 1668126 -> 1657509 (-0.64%)
instructions in affected programs: 242235 -> 231618 (-4.38%)
---
src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp | 3 +++
1 file changed, 3 insertions(+)
diff --git a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
index 921e909..c73e58d 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
@@ -277,6 +277,9 @@ vec4_visitor::fix_3src_operand(src_reg src)
if (src.file != UNIFORM && src.file != IMM)
return src;
+ if (src.file == UNIFORM && brw_is_single_value_swizzle(src.swizzle))
+ return src;
+
dst_reg expanded = dst_reg(this, glsl_type::vec4_type);
expanded.type = src.type;
emit(MOV(expanded, src));
--
1.8.3.2
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