[Mesa-dev] [PATCH 11/12] i965/fs: don't propagate cmod when the exec sizes differ

[Connor Abbott]

This can happen when the source of the compare was split by the SIMD
lowering pass. Potentially, we could allow the case where the exec size
of scan_inst is larger, and scan_inst has the right quarter selected,
but doing that seems a little more risky.

Signed-off-by: Connor Abbott <connor.w.abbott at intel.com>
---
 src/mesa/drivers/dri/i965/brw_fs_cmod_propagation.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/brw_fs_cmod_propagation.cpp b/src/mesa/drivers/dri/i965/brw_fs_cmod_propagation.cpp
index 469f2ea..e444390 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_cmod_propagation.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_cmod_propagation.cpp
@@ -94,6 +94,9 @@ opt_cmod_propagation_local(bblock_t *block)
                 scan_inst->dst.reg_offset != inst->src[0].reg_offset)
                break;
 
+            if (scan_inst->exec_size != inst->exec_size)
+               break;
+
             /* CMP's result is the same regardless of dest type. */
             if (inst->conditional_mod == BRW_CONDITIONAL_NZ &&
                 scan_inst->opcode == BRW_OPCODE_CMP &&
-- 
2.4.3