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nir: Optimize a + neg(a)

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Shader-db i965 instructions:
total instructions in shared programs: 1711180 -> 1711159 (-0.00%)
instructions in affected programs:     825 -> 804 (-2.55%)
helped:                                9
HURT:                                  0
GAINED:                                3
LOST:                                  3

Shader-db NIR instructions:
total instructions in shared programs: 606187 -> 606179 (-0.00%)
instructions in affected programs:     298 -> 290 (-2.68%)
helped:                                4
HURT:                                  0
GAINED:                                0
LOST:                                  0

Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>
Signed-off-by: Thomas Helland <thomashelland90@gmail.com>
This commit is contained in:
Thomas Helland
2015-02-28 20:32:32 +01:00
committed by Matt Turner
parent 0525f2e851
commit 8fb8fe46fa
1 changed files with 2 additions and 0 deletions
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src/glsl/nir/nir_opt_algebraic.py
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@@ -58,6 +58,8 @@ optimizations = [
(('iadd', a, 0), a),
(('fadd', ('fmul', a, b), ('fmul', a, c)), ('fmul', a, ('fadd', b, c))),
(('iadd', ('imul', a, b), ('imul', a, c)), ('imul', a, ('iadd', b, c))),
(('fadd', ('fneg', a), a), 0.0),
(('iadd', ('ineg', a), a), 0),
(('fmul', a, 0.0), 0.0),
(('imul', a, 0), 0),
(('fmul', a, 1.0), a),