Mesa (master): i965/vec4: Don' t fix-up scalar uniforms for 3 src instructions.

[Matt Turner]

Module: Mesa
Branch: master
Commit: 3330dec90ccba5d6c2932ff4e223d37eaa97fc60
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=3330dec90ccba5d6c2932ff4e223d37eaa97fc60

Author: Matt Turner <mattst88 at gmail.com>
Date:   Sat Mar  8 12:16:13 2014 -0800

i965/vec4: Don't fix-up scalar uniforms for 3 src instructions.

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%)

Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>

---

 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));