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nir: Add algebraic optimizations for exponential/logarithmic functions.

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Most of these exist in the GLSL IR algebraic pass already.  However,
SSA allows us to find more instances of the patterns.

total NIR instructions in shared programs: 2015593 -> 2011430 (-0.21%)
NIR instructions in affected programs:     124189 -> 120026 (-3.35%)
helped:                                    604

total i965 instructions in shared programs: 6025505 -> 6018717 (-0.11%)
i965 instructions in affected programs:     261295 -> 254507 (-2.60%)
helped:                                     1295
HURT:                                       3

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Kenneth Graunke
2015-01-21 23:47:06 -08:00
parent 391fb32bbe
commit bbd60f6d79
1 changed files with 10 additions and 0 deletions
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src/glsl/nir/nir_opt_algebraic.py
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@@ -96,6 +96,16 @@ optimizations = [
(('ishr', a, 0), a),
(('ushr', 0, a), 0),
(('ushr', a, 0), 0),
# Exponential/logarithmic identities
(('fexp2', ('flog2', a)), a), # 2^lg2(a) = a
(('fexp', ('flog', a)), a), # e^ln(a) = a
(('flog2', ('fexp2', a)), a), # lg2(2^a) = a
(('flog', ('fexp', a)), a), # ln(e^a) = a
(('fexp2', ('fmul', ('flog2', a), b)), ('fpow', a, b)), # 2^(lg2(a)*b) = a^b
(('fexp', ('fmul', ('flog', a), b)), ('fpow', a, b)), # e^(ln(a)*b) = a^b
(('fpow', a, 1.0), a),
(('fpow', a, 2.0), ('fmul', a, a)),
(('fpow', 2.0, a), ('fexp2', a)),
# This one may not be exact
(('feq', ('fadd', a, b), 0.0), ('feq', a, ('fneg', b))),