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Diffstat (limited to 'src/compiler/nir')
| -rw-r--r-- | src/compiler/nir/nir_opt_algebraic.py | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/src/compiler/nir/nir_opt_algebraic.py b/src/compiler/nir/nir_opt_algebraic.py index 11d6aca1183..702fcbfa57d 100644 --- a/src/compiler/nir/nir_opt_algebraic.py +++ b/src/compiler/nir/nir_opt_algebraic.py @@ -565,6 +565,19 @@ optimizations = [ (('~f2u32', ('i2f', 'a@32')), a), (('~f2u32', ('u2f', 'a@32')), a), + # Section 5.4.1 (Conversion and Scalar Constructors) of the GLSL 4.60 spec + # says: + # + # It is undefined to convert a negative floating-point value to an + # uint. + # + # Assuming that (uint)some_float behaves like (uint)(int)some_float allows + # some optimizations in the i965 backend to proceed. + (('ige', ('f2u', a), b), ('ige', ('f2i', a), b)), + (('ige', b, ('f2u', a)), ('ige', b, ('f2i', a))), + (('ilt', ('f2u', a), b), ('ilt', ('f2i', a), b)), + (('ilt', b, ('f2u', a)), ('ilt', b, ('f2i', a))), + # Packing and then unpacking does nothing (('unpack_64_2x32_split_x', ('pack_64_2x32_split', a, b)), a), (('unpack_64_2x32_split_y', ('pack_64_2x32_split', a, b)), b), |