diff options
| author | Kenneth Graunke <kenneth@whitecape.org> | 2013-04-03 23:56:57 -0700 |
|---|---|---|
| committer | Kenneth Graunke <kenneth@whitecape.org> | 2013-04-04 15:38:19 -0700 |
| commit | edc52a8f280db8d9dc9a04314741319ea8b83e67 (patch) | |
| tree | ae9866c0c13ccfec896c5dd1ed433ad22956cced /src/glsl/Makefile.sources | |
| parent | 967514ce680f7bf785ab544c6174786dd20425de (diff) | |
glsl: Add an optimization pass to flatten simple nested if blocks.
GLBenchmark 2.7's shaders contain conditional blocks like:
if (x) {
if (y) {
...
}
}
where the outer conditional's then clause contains exactly one statement
(the nested if) and there are no else clauses. This can easily be
optimized into:
if (x && y) {
...
}
This saves a few instructions in GLBenchmark 2.7:
total instructions in shared programs: 11833 -> 11649 (-1.55%)
instructions in affected programs: 8234 -> 8050 (-2.23%)
It also helps CS:GO slightly (-0.05%/-0.22%). More importantly,
however, it simplifies the control flow graph, which could enable other
optimizations.
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Diffstat (limited to 'src/glsl/Makefile.sources')
| -rw-r--r-- | src/glsl/Makefile.sources | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/glsl/Makefile.sources b/src/glsl/Makefile.sources index c294aa4296c..b5282a6041e 100644 --- a/src/glsl/Makefile.sources +++ b/src/glsl/Makefile.sources @@ -80,6 +80,7 @@ LIBGLSL_FILES = \ $(GLSL_SRCDIR)/opt_dead_code.cpp \ $(GLSL_SRCDIR)/opt_dead_code_local.cpp \ $(GLSL_SRCDIR)/opt_dead_functions.cpp \ + $(GLSL_SRCDIR)/opt_flatten_nested_if_blocks.cpp \ $(GLSL_SRCDIR)/opt_function_inlining.cpp \ $(GLSL_SRCDIR)/opt_if_simplification.cpp \ $(GLSL_SRCDIR)/opt_noop_swizzle.cpp \ |