[Mesa-dev] [PATCH] i965/fs: Add support for removing NOT.NZ and NOT.Z instructions.

[Ian Romanick]

From: Ian Romanick <ian.d.romanick at intel.com>

Shader-db results:

GM45 and Iron Lake:
total instructions in shared programs: 7888585 -> 7888585 (0.00%)
instructions in affected programs:     0 -> 0

Sandy Bridge, Ivy Bridge, Haswell, and Broadwell:
total instructions in shared programs: 9598608 -> 9598572 (-0.00%)
instructions in affected programs:     6506 -> 6470 (-0.55%)
helped:                                36

Signed-off-by: Ian Romanick <ian.d.romanick at intel.com>
---
 src/mesa/drivers/dri/i965/brw_fs_cmod_propagation.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

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..d72a83a 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_cmod_propagation.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_cmod_propagation.cpp
@@ -59,7 +59,8 @@ opt_cmod_propagation_local(bblock_t *block)
 
       if ((inst->opcode != BRW_OPCODE_AND &&
            inst->opcode != BRW_OPCODE_CMP &&
-           inst->opcode != BRW_OPCODE_MOV) ||
+           inst->opcode != BRW_OPCODE_MOV &&
+           inst->opcode != BRW_OPCODE_NOT) ||
           inst->predicate != BRW_PREDICATE_NONE ||
           !inst->dst.is_null() ||
           inst->src[0].file != GRF ||
@@ -86,6 +87,11 @@ opt_cmod_propagation_local(bblock_t *block)
           inst->conditional_mod != BRW_CONDITIONAL_NZ)
          continue;
 
+      if (inst->opcode == BRW_OPCODE_NOT &&
+          inst->conditional_mod != BRW_CONDITIONAL_Z &&
+          inst->conditional_mod != BRW_CONDITIONAL_NZ)
+         continue;
+
       bool read_flag = false;
       foreach_inst_in_block_reverse_starting_from(fs_inst, scan_inst, inst,
                                                   block) {
-- 
2.1.0