Mesa (master): i965: Don't request GLSL IR lowering of gl_VertexID

[Ian Romanick]

Module: Mesa
Branch: master
Commit: 19e0dd1ad3ad43ddc3aeba1e11852dce3f55d1f1
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=19e0dd1ad3ad43ddc3aeba1e11852dce3f55d1f1

Author: Ian Romanick <ian.d.romanick at intel.com>
Date:   Wed Oct 18 08:59:47 2017 -0700

i965: Don't request GLSL IR lowering of gl_VertexID

Let the lowering in NIR handle it instead.

This hurts one shader that occurs twice in shader-db (SynMark GSCloth)
on IVB and HSW.  No other shaders or platforms were affected.

total cycles in shared programs: 253438422 -> 253438426 (0.00%)
cycles in affected programs: 412 -> 416 (0.97%)
helped: 0
HURT: 2

Signed-off-by: Ian Romanick <ian.d.romanick at intel.com>
Reviewed-by: Antia Puentes <apuentes at igalia.com>

---

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

diff --git a/src/mesa/drivers/dri/i965/brw_context.c b/src/mesa/drivers/dri/i965/brw_context.c
index fca5c8e307..4e37425099 100644
--- a/src/mesa/drivers/dri/i965/brw_context.c
+++ b/src/mesa/drivers/dri/i965/brw_context.c
@@ -595,7 +595,6 @@ brw_initialize_context_constants(struct brw_context *brw)
       ctx->Const.QuadsFollowProvokingVertexConvention = false;
 
    ctx->Const.NativeIntegers = true;
-   ctx->Const.VertexID_is_zero_based = true;
 
    /* Regarding the CMP instruction, the Ivybridge PRM says:
     *