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glsl2: Add constant propagation.

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Whereas constant folding evaluates constant expressions at rvalue
nodes, constant propagation tracks constant components of vectors
across execution to replace (possibly swizzled) variable dereferences
with constant values, triggering possible constant folding or reduced
variable liveness.
This commit is contained in:
Eric Anholt
2010-08-09 17:03:46 -07:00
parent 81996ae861
commit 8bebbeb7c5
6 changed files with 486 additions and 0 deletions
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1
src/glsl/ir_optimization.h
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@@ -33,6 +33,7 @@ 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_constant_propagation(exec_list *instructions);
bool do_dead_code(exec_list *instructions);
bool do_dead_code_local(exec_list *instructions);
bool do_dead_code_unlinked(exec_list *instructions);