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nir: Optimize useless comparisons against true/false.

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Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com> [v1]
Reviewed-by: Eric Anholt <eric@anholt.net> [v1]

v2: Move new rule to Boolean simplification section
    Add a a@bool != true simplification

Suggested-by: Neil Roberts <neil@linux.intel.com>
This commit is contained in:
Matt Turner 2015-12-01 16:13:11 -08:00
parent 9e9e6fc8f1
commit 3a7f95b3aa
1 changed files with 4 additions and 2 deletions
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6
src/glsl/nir/nir_opt_algebraic.py
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@ -184,8 +184,10 @@ optimizations = [
(('fsqrt', a), ('frcp', ('frsq', a)), 'options->lower_fsqrt'),
(('frcp', ('frsq', a)), ('fsqrt', a), '!options->lower_fsqrt'),
# Boolean simplifications
(('ine', 'a@bool', 0), 'a'),
(('ieq', 'a@bool', 0), ('inot', 'a')),
(('ieq', 'a@bool', True), a),
(('ine', 'a@bool', True), ('inot', a)),
(('ine', 'a@bool', False), a),
(('ieq', 'a@bool', False), ('inot', 'a')),
(('bcsel', a, True, False), ('ine', a, 0)),
(('bcsel', a, False, True), ('ieq', a, 0)),
(('bcsel', True, b, c), b),