By flattening the if statements we cut 213 instructions from the
fragment shader (601 -> 388, or 35%), and we remove all register
spilling on i965.
Reduces runtime of "ext_transform_feedback-max-varyings" by
-73.0547% +/- 0.682694% (n=27).
---
tests/spec/ext_transform_feedback/max-varyings.c | 10 ++++------
1 file changed, 4 insertions(+), 6 deletions(-)
diff --git a/tests/spec/ext_transform_feedback/max-varyings.c
b/tests/spec/ext_transform_feedback/max-varyings.c
index 7028fb1..497e432 100644
--- a/tests/spec/ext_transform_feedback/max-varyings.c
+++ b/tests/spec/ext_transform_feedback/max-varyings.c
@@ -99,13 +99,11 @@ get_fs(int num_varyings)
"\n"
"void main()\n"
"{\n"
- " int i;\n"
- " gl_FragColor = vec4(0.0, 1.0, 0.0, 1.0);\n"
- " for(i = 0; i < v.length(); ++i) {\n"
- " if (v[i] != 4.0*i + vec4(0.0, 1.0, 2.0, 3.0)) {\n"
- " gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);\n"
- " }\n"
+ " bool failed = false;\n"
+ " for(int i = 0; i < v.length(); ++i) {\n"
+ " failed = failed || (v[i] != 4.0*i + vec4(0.0, 1.0, 2.0,
3.0));\n"
" }\n"
+ " gl_FragColor = vec4(float(failed), 1.0 - float(failed), 0.0,
1.0);\n"
"}\n", num_varyings);
shader = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fstext);
--
2.0.5
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