From: Chris Forbes <chrisf@ijw.co.nz>
Date: Sat, 6 Dec 2014 21:12:36 +0000 (+1300)
Subject: i965: Fix regs read for FS_OPCODE_INTERP_PER_SLOT_OFFSET
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=092c73a7c32b240a26ffeab2ee475f6d590540b2;p=mesa.git

i965: Fix regs read for FS_OPCODE_INTERP_PER_SLOT_OFFSET

Dead code elimination was eating the Y offset.

Fixes the piglit test:
spec/ARB_gpu_shader5/arb_gpu_shader5-interpolateAtOffset-nonconst

Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>
---

diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 37857e91042..389c8ae183c 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -902,6 +902,8 @@ fs_inst::regs_read(fs_visitor *v, int arg) const
       return mlen;
    } else if (opcode == SHADER_OPCODE_UNTYPED_SURFACE_READ && arg == 0) {
       return mlen;
+   } else if (opcode == FS_OPCODE_INTERPOLATE_AT_PER_SLOT_OFFSET && arg == 0) {
+      return mlen;
    }
 
    switch (src[arg].file) {