Mesa (master): i965: Use NIR by default for vertex shaders on GEN8+

[Jason Ekstrand]

Module: Mesa
Branch: master
Commit: 42298b05d1ebd8b17b89411723ae13295643e496
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=42298b05d1ebd8b17b89411723ae13295643e496

Author: Jason Ekstrand <jason.ekstrand at intel.com>
Date:   Thu May  7 15:07:49 2015 -0700

i965: Use NIR by default for vertex shaders on GEN8+

GLSL IR vs. NIR shader-db results for SIMD8 vertex shaders on Broadwell:

   total instructions in shared programs: 2742062 -> 2681339 (-2.21%)
   instructions in affected programs:     1514770 -> 1454047 (-4.01%)
   helped:                                5813
   HURT:                                  1120

The gained programs are ARB vertext programs that were previously going
through the vec4 backend.  Now that we have prog_to_nir, ARB vertex
programs can go through the scalar backend so they show up as "gained" in
the shader-db results.

Acked-by: Kenneth Graunke <kenneth at whitecape.org>
Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>
Acked-by: Matt Turner <mattst88 at gmail.com>

---

 src/mesa/drivers/dri/i965/brw_context.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/mesa/drivers/dri/i965/brw_context.c b/src/mesa/drivers/dri/i965/brw_context.c
index 673529a..ea56859 100644
--- a/src/mesa/drivers/dri/i965/brw_context.c
+++ b/src/mesa/drivers/dri/i965/brw_context.c
@@ -590,7 +590,7 @@ brw_initialize_context_constants(struct brw_context *brw)
       ctx->Const.ShaderCompilerOptions[MESA_SHADER_VERTEX].EmitNoIndirectTemp = true;
       ctx->Const.ShaderCompilerOptions[MESA_SHADER_VERTEX].OptimizeForAOS = false;
 
-      if (brw_env_var_as_boolean("INTEL_USE_NIR", false))
+      if (brw_env_var_as_boolean("INTEL_USE_NIR", true))
          ctx->Const.ShaderCompilerOptions[MESA_SHADER_VERTEX].NirOptions = &nir_options;
    }