[Mesa-dev] [PATCH 2/2] i965: Fix regs read for FS_OPCODE_INTERP_PER_SLOT_OFFSET

[Chris Forbes]

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 at ijw.co.nz>
---
 src/mesa/drivers/dri/i965/brw_fs.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 37857e9..389c8ae 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) {
-- 
2.1.3