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nir: Lower subtraction to add with negation when !lower_negate. 

prog->nir will generate fsub opcodes, but i965 doesn't implement them.
We may as well lower them at the NIR level, since it's trivial to do.

Suggested by Connor Abbott.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Kenneth Graunke 2015-03-25 15:22:12 -07:00
parent faf6106c6f
commit bf2c3bc316
1 changed files with 2 additions and 0 deletions
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2
src/glsl/nir/nir_opt_algebraic.py
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@ -161,6 +161,8 @@ optimizations = [
# Subtracts # Subtracts
(('fsub', a, ('fsub', 0.0, b)), ('fadd', a, b)), (('fsub', a, ('fsub', 0.0, b)), ('fadd', a, b)),
(('isub', a, ('isub', 0, b)), ('iadd', a, b)), (('isub', a, ('isub', 0, b)), ('iadd', a, b)),
(('fsub', a, b), ('fadd', a, ('fneg', b)), '!options->lower_negate'),
(('isub', a, b), ('iadd', a, ('ineg', b)), '!options->lower_negate'),
(('fneg', a), ('fsub', 0.0, a), 'options->lower_negate'), (('fneg', a), ('fsub', 0.0, a), 'options->lower_negate'),
(('ineg', a), ('isub', 0, a), 'options->lower_negate'), (('ineg', a), ('isub', 0, a), 'options->lower_negate'),
(('fadd', a, ('fsub', 0.0, b)), ('fsub', a, b)), (('fadd', a, ('fsub', 0.0, b)), ('fsub', a, b)),