Mesa (master): i965/vec4: fill src_reg type using the constructor type parameter

[Iago Toral Quiroga]

Module: Mesa
Branch: master
Commit: 4de86e1371b0d59a5b9a787b726be3d373024647
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=4de86e1371b0d59a5b9a787b726be3d373024647

Author: Alejandro Piñeiro <apinheiro at igalia.com>
Date:   Tue Sep  1 17:02:20 2015 +0200

i965/vec4: fill src_reg type using the constructor type parameter

The src_reg constructor that received the glsl_type was using it
only to build the swizzle, but not to fill this->type as dst_reg
is doing.

This caused some type mismatch between movs and alu operations
on the NIR path, so copy propagation optimization was not applied
to remove unneeded movs if negate modifier was involved. This was
first detected on minus (negate+add) operations.

Shader DB results (taking into account only vec4):

total instructions in shared programs: 20019 -> 19934 (-0.42%)
instructions in affected programs:     2918 -> 2833 (-2.91%)
helped:                                79
HURT:                                  0
GAINED:                                0
LOST:                                  0

Reviewed-by: Matt Turner <mattst88 at gmail.com>

---

 src/mesa/drivers/dri/i965/brw_vec4.cpp |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/brw_vec4.cpp b/src/mesa/drivers/dri/i965/brw_vec4.cpp
index b97b6c1..501461c 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4.cpp
@@ -61,6 +61,8 @@ src_reg::src_reg(register_file file, int reg, const glsl_type *type)
       this->swizzle = brw_swizzle_for_size(type->vector_elements);
    else
       this->swizzle = BRW_SWIZZLE_XYZW;
+   if (type)
+      this->type = brw_type_for_base_type(type);
 }
 
 /** Generic unset register constructor. */