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nir: Add addition/multiplication identities of exp/log.

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instructions in affected programs:     2858 -> 2808 (-1.75%)
helped:                                12

Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Matt Turner
2015-03-26 11:08:01 -07:00
parent 099c729b4c
commit a2b6e908cf
1 changed files with 6 additions and 0 deletions
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src/glsl/nir/nir_opt_algebraic.py
+6
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@@ -153,6 +153,12 @@ optimizations = [
(('flog', ('frsq', a)), ('fmul', -0.5, ('flog', a))),
(('flog2', ('fpow', a, b)), ('fmul', b, ('flog2', a))),
(('flog', ('fpow', a, b)), ('fmul', b, ('flog', a))),
(('fadd', ('flog2', a), ('flog2', b)), ('flog2', ('fmul', a, b))),
(('fadd', ('flog', a), ('flog', b)), ('flog', ('fmul', a, b))),
(('fadd', ('flog2', a), ('fneg', ('flog2', b))), ('flog2', ('fdiv', a, b))),
(('fadd', ('flog', a), ('fneg', ('flog', b))), ('flog', ('fdiv', a, b))),
(('fmul', ('fexp2', a), ('fexp2', b)), ('fexp2', ('fadd', a, b))),
(('fmul', ('fexp', a), ('fexp', b)), ('fexp', ('fadd', a, b))),
# Division and reciprocal
(('fdiv', 1.0, a), ('frcp', a)),
(('frcp', ('frcp', a)), a),