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glsl: Add a new opt_copy_propagation variant that does it channel-wise.

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This patch cleans up many of the extra copies in GLSL IR introduced by
i965's scalarizing passes.  It doesn't result in a statistically
significant performance difference on nexuiz high settings (n=3) or my
demo (n=10), due to brw_fs.cpp's register coalescing covering most of
those extra moves anyway.  However, it does make the debug of wine's
GLSL shaders much more tractable, and reduces instruction count of
glsl-fs-convolution-2 from 376 to 288.
This commit is contained in:
Eric Anholt
2011-01-25 10:28:13 +10:00
parent cde443e0b9
commit e31266ed3e
4 changed files with 464 additions and 0 deletions
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1
src/glsl/ir_optimization.h
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@@ -43,6 +43,7 @@ bool do_constant_folding(exec_list *instructions);
bool do_constant_variable(exec_list *instructions);
bool do_constant_variable_unlinked(exec_list *instructions);
bool do_copy_propagation(exec_list *instructions);
bool do_copy_propagation_elements(exec_list *instructions);
bool do_constant_propagation(exec_list *instructions);
bool do_dead_code(exec_list *instructions);
bool do_dead_code_local(exec_list *instructions);