Removes if/endif and if/else/endif.
total instructions in shared programs: 1366420 -> 1356988 (-0.69%)
instructions in affected programs: 160818 -> 151386 (-5.87%)
---
Split mistakenly squashed patch.
src/mesa/drivers/dri/i965/Makefile.sources | 1 +
src/mesa/drivers/dri/i965/brw_fs.cpp | 1 +
src/mesa/drivers/dri/i965/brw_fs.h | 1 +
.../drivers/dri/i965/brw_fs_dead_control_flow.cpp | 80 ++++++++++++++++++++++
4 files changed, 83 insertions(+)
create mode 100644 src/mesa/drivers/dri/i965/brw_fs_dead_control_flow.cpp
diff --git a/src/mesa/drivers/dri/i965/Makefile.sources
b/src/mesa/drivers/dri/i965/Makefile.sources
index 5ddb421..37a8380 100644
--- a/src/mesa/drivers/dri/i965/Makefile.sources
+++ b/src/mesa/drivers/dri/i965/Makefile.sources
@@ -56,6 +56,7 @@ i965_FILES = \
brw_fs_channel_expressions.cpp \
brw_fs_copy_propagation.cpp \
brw_fs_cse.cpp \
+ brw_fs_dead_control_flow.cpp \
brw_fs_fp.cpp \
brw_fs_generator.cpp \
brw_fs_live_variables.cpp \
diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp
b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 7a4e005..4f1d2ca 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -3133,6 +3133,7 @@ fs_visitor::run()
progress = opt_peephole_sel() || progress;
progress = dead_code_eliminate() || progress;
progress = dead_code_eliminate_local() || progress;
+ progress = dead_control_flow_eliminate() || progress;
progress = register_coalesce() || progress;
progress = register_coalesce_2() || progress;
progress = compute_to_mrf() || progress;
diff --git a/src/mesa/drivers/dri/i965/brw_fs.h
b/src/mesa/drivers/dri/i965/brw_fs.h
index a67ef86..208d3ab 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.h
+++ b/src/mesa/drivers/dri/i965/brw_fs.h
@@ -318,6 +318,7 @@ public:
bool compute_to_mrf();
bool dead_code_eliminate();
bool dead_code_eliminate_local();
+ bool dead_control_flow_eliminate();
bool remove_dead_constants();
bool remove_duplicate_mrf_writes();
bool virtual_grf_interferes(int a, int b);
diff --git a/src/mesa/drivers/dri/i965/brw_fs_dead_control_flow.cpp
b/src/mesa/drivers/dri/i965/brw_fs_dead_control_flow.cpp
new file mode 100644
index 0000000..4e8fdcd
--- /dev/null
+++ b/src/mesa/drivers/dri/i965/brw_fs_dead_control_flow.cpp
@@ -0,0 +1,80 @@
+/*
+ * Copyright © 2013 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+/** @file brw_fs_dead_control_flow.cpp
+ *
+ * This file implements the dead control flow elimination optimization pass.
+ */
+
+#include "brw_fs.h"
+#include "brw_cfg.h"
+
+/* Look for and eliminate dead control flow:
+ *
+ * - if/endif
+ * - if/else/endif
+ */
+bool
+fs_visitor::dead_control_flow_eliminate()
+{
+ bool progress = false;
+
+ cfg_t cfg(this);
+
+ for (int b = 0; b < cfg.num_blocks; b++) {
+ bblock_t *block = cfg.blocks[b];
+ bool found = false;
+
+ /* ENDIF instructions, by definition, can only be found at the ends of
+ * basic blocks.
+ */
+ fs_inst *endif_inst = (fs_inst *) block->end;
+ if (endif_inst->opcode != BRW_OPCODE_ENDIF)
+ continue;
+
+ fs_inst *if_inst = NULL, *else_inst = NULL;
+ fs_inst *prev_inst = (fs_inst *) endif_inst->prev;
+ if (prev_inst->opcode == BRW_OPCODE_IF) {
+ if_inst = prev_inst;
+ found = true;
+ } else if (prev_inst->opcode == BRW_OPCODE_ELSE) {
+ else_inst = prev_inst;
+
+ prev_inst = (fs_inst *) prev_inst->prev;
+ if (prev_inst->opcode == BRW_OPCODE_IF) {
+ if_inst = prev_inst;
+ found = true;
+ }
+ }
+
+ if (found) {
+ if_inst->remove();
+ if (else_inst)
+ else_inst->remove();
+ endif_inst->remove();
+ progress = true;
+ }
+ }
+
+ return progress;
+}
--
1.8.3.2
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