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nir: Add identities for the log function.

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The rcp(log(x)) pattern affects instruction counts.

instructions in affected programs:     144 -> 138 (-4.17%)
helped:                                6

Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Matt Turner
2015-03-26 10:07:58 -07:00
parent 8a6ae384b2
commit 099c729b4c
1 changed files with 8 additions and 0 deletions
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src/glsl/nir/nir_opt_algebraic.py
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@@ -145,6 +145,14 @@ optimizations = [
(('frcp', ('fexp', a)), ('fexp', ('fneg', a))),
(('frsq', ('fexp2', a)), ('fexp2', ('fmul', -0.5, a))),
(('frsq', ('fexp', a)), ('fexp', ('fmul', -0.5, a))),
(('flog2', ('fsqrt', a)), ('fmul', 0.5, ('flog2', a))),
(('flog', ('fsqrt', a)), ('fmul', 0.5, ('flog', a))),
(('flog2', ('frcp', a)), ('fneg', ('flog2', a))),
(('flog', ('frcp', a)), ('fneg', ('flog', a))),
(('flog2', ('frsq', a)), ('fmul', -0.5, ('flog2', a))),
(('flog', ('frsq', a)), ('fmul', -0.5, ('flog', a))),
(('flog2', ('fpow', a, b)), ('fmul', b, ('flog2', a))),
(('flog', ('fpow', a, b)), ('fmul', b, ('flog', a))),
# Division and reciprocal
(('fdiv', 1.0, a), ('frcp', a)),
(('frcp', ('frcp', a)), a),