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nir: Mark bcsel-to-fmin (or fmax) transformations as inexact

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These transformations are inexact because section 4.7.1 (Range and
Precision) says:

    Operations and built-in functions that operate on a NaN are not
    required to return a NaN as the result.

The fmin or fmax might not return NaN in cases where the original
expression would be required to return NaN.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
This commit is contained in:
Ian Romanick
2018-02-26 14:49:47 -08:00
parent 4addd34b04
commit 380136e998
1 changed files with 2 additions and 2 deletions
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src/compiler/nir/nir_opt_algebraic.py
+2 -2
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@@ -168,8 +168,8 @@ optimizations = [
(('flt(is_not_used_by_conditional)', ('fadd(is_used_once)', a, ('fneg', b)), 0.0), ('flt', a, b)),
(('fge', ('fneg', ('fabs', a)), 0.0), ('feq', a, 0.0)),
(('bcsel', ('flt', b, a), b, a), ('fmin', a, b)),
(('bcsel', ('flt', a, b), b, a), ('fmax', a, b)),
(('~bcsel', ('flt', b, a), b, a), ('fmin', a, b)),
(('~bcsel', ('flt', a, b), b, a), ('fmax', a, b)),
(('~bcsel', ('fge', a, b), b, a), ('fmin', a, b)),
(('~bcsel', ('fge', b, a), b, a), ('fmax', a, b)),
(('bcsel', ('inot', a), b, c), ('bcsel', a, c, b)),