diff options
| author | Kenneth Graunke <[email protected]> | 2015-03-25 15:22:12 -0700 |
|---|---|---|
| committer | Kenneth Graunke <[email protected]> | 2015-03-27 21:16:34 -0700 |
| commit | bf2c3bc316cbfcc19d1bb65ab7410784ed7a3dac (patch) | |
| tree | 771ed6fe47e30b6b21d76eedabf3a47ab10ab24e | |
| parent | faf6106c6f6fa2ba90ec175baaa8b54bec9f5125 (diff) | |
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 <[email protected]>
Reviewed-by: Connor Abbott <[email protected]>
Reviewed-by: Eric Anholt <[email protected]>
| -rw-r--r-- | src/glsl/nir/nir_opt_algebraic.py | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/glsl/nir/nir_opt_algebraic.py b/src/glsl/nir/nir_opt_algebraic.py index 20ec4d3a39a..66b456d1164 100644 --- a/src/glsl/nir/nir_opt_algebraic.py +++ b/src/glsl/nir/nir_opt_algebraic.py @@ -161,6 +161,8 @@ optimizations = [ # Subtracts (('fsub', a, ('fsub', 0.0, b)), ('fadd', 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'), (('ineg', a), ('isub', 0, a), 'options->lower_negate'), (('fadd', a, ('fsub', 0.0, b)), ('fsub', a, b)), |