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nir: Add algebraic opt for int comparisons with identical operands.

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No change on shader-db on i965.

v2: Reword the comment due to feedback from Erik Faye-Lund

Reviewed-by: Connor Abbott <cwabbott0@gmail.com> (v1)
Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com> (v1)
This commit is contained in:
Eric Anholt 2015-02-06 17:12:59 -08:00
parent 2919bdf466
commit 56e21647e2
1 changed files with 9 additions and 0 deletions
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9
src/glsl/nir/nir_opt_algebraic.py
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@ -83,6 +83,15 @@ optimizations = [
(('fne', ('fadd', a, b), 0.0), ('fne', a, ('fneg', b))),
(('fge', ('fneg', ('fabs', a)), 0.0), ('feq', a, 0.0)),
(('fmin', ('fmax', a, 0.0), 1.0), ('fsat', a)),
# Comparison with the same args. Note that these are not done for
# the float versions because NaN always returns false on float
# inequalities.
(('ilt', a, a), False),
(('ige', a, a), True),
(('ieq', a, a), True),
(('ine', a, a), False),
(('ult', a, a), False),
(('uge', a, a), True),
# Logical and bit operations
(('fand', a, 0.0), 0.0),
(('iand', a, a), a),