From: Ian Romanick <ian.d.roman...@intel.com>
On BDW,
total instructions in shared programs: 8448571 -> 8448367 (-0.00%)
instructions in affected programs: 21000 -> 20796 (-0.97%)
helped: 116
HURT: 0
Signed-off-by: Ian Romanick <ian.d.roman...@intel.com>
---
src/mesa/drivers/dri/i965/brw_dead_control_flow.cpp | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/src/mesa/drivers/dri/i965/brw_dead_control_flow.cpp
b/src/mesa/drivers/dri/i965/brw_dead_control_flow.cpp
index 7aa72b1..149596f 100644
--- a/src/mesa/drivers/dri/i965/brw_dead_control_flow.cpp
+++ b/src/mesa/drivers/dri/i965/brw_dead_control_flow.cpp
@@ -34,6 +34,7 @@
* - if/endif
* . else in else/endif
* - if/else/endif
+ * - then in if/else/endif
*/
bool
dead_control_flow_eliminate(backend_shader *s)
@@ -114,6 +115,23 @@ dead_control_flow_eliminate(backend_shader *s)
progress = true;
}
+ } else if (inst->opcode == BRW_OPCODE_ELSE &&
+ prev_inst->opcode == BRW_OPCODE_IF) {
+ bblock_t *const else_block = block;
+ bblock_t *const if_block = prev_block;
+ backend_instruction *const if_inst = prev_inst;
+ backend_instruction *const else_inst = inst;
+
+ /* Since the else-branch is becoming the new then-branch, the
+ * condition has to be inverted.
+ */
+ if_inst->predicate_inverse = !if_inst->predicate_inverse;
+ else_inst->remove(else_block);
+
+ if (if_block->can_combine_with(else_block))
+ if_block->combine_with(else_block);
+
+ progress = true;
}
}
--
2.5.0
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