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nir: Optimize find_lsb/imsb/umsb error checks

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Two of the ARB_shader_ballot piglit tests hit the find_lsb case,
removing some of the noise allowed me to better debug the test when it
was failing.

Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
This commit is contained in:
Matt Turner
2017-06-30 15:48:19 -07:00
parent 069bf7c907
commit aff108f2fd
1 changed files with 11 additions and 0 deletions
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11
src/compiler/nir/nir_opt_algebraic.py
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@@ -357,6 +357,17 @@ optimizations = [
(('~fadd', '#a', ('fadd', b, '#c')), ('fadd', ('fadd', a, c), b)),
(('iadd', '#a', ('iadd', b, '#c')), ('iadd', ('iadd', a, c), b)),
# By definition...
(('bcsel', ('ige', ('find_lsb', a), 0), ('find_lsb', a), -1), ('find_lsb', a)),
(('bcsel', ('ige', ('ifind_msb', a), 0), ('ifind_msb', a), -1), ('ifind_msb', a)),
(('bcsel', ('ige', ('ufind_msb', a), 0), ('ufind_msb', a), -1), ('ufind_msb', a)),
(('bcsel', ('ine', a, 0), ('find_lsb', a), -1), ('find_lsb', a)),
(('bcsel', ('ine', a, 0), ('ifind_msb', a), -1), ('ifind_msb', a)),
(('bcsel', ('ine', a, 0), ('ufind_msb', a), -1), ('ufind_msb', a)),
(('bcsel', ('ine', a, -1), ('ifind_msb', a), -1), ('ifind_msb', a)),
# Misc. lowering
(('fmod@32', a, b), ('fsub', a, ('fmul', b, ('ffloor', ('fdiv', a, b)))), 'options->lower_fmod32'),
(('fmod@64', a, b), ('fsub', a, ('fmul', b, ('ffloor', ('fdiv', a, b)))), 'options->lower_fmod64'),