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nir: Add lowering of POW instructions if the lower flag is set.

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This could be done in a separate pass like we do in GLSL IR, but it seems
to me like having the definitions of the transformations in the two
directions next to each other makes a lot of sense.

v2: Reorder the comment about the transformation.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Eric Anholt 2015-01-28 10:32:57 -08:00
parent 8e9dbfff17
commit ccf14bca4b
1 changed files with 1 additions and 0 deletions
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src/glsl/nir/nir_opt_algebraic.py
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@ -118,6 +118,7 @@ optimizations = [
(('fexp', ('flog', a)), a), # e^ln(a) = a
(('flog2', ('fexp2', a)), a), # lg2(2^a) = a
(('flog', ('fexp', a)), a), # ln(e^a) = a
(('fpow', a, b), ('fexp2', ('fmul', ('flog2', a), b)), 'options->lower_fpow'), # a^b = 2^(lg2(a)*b)
(('fexp2', ('fmul', ('flog2', a), b)), ('fpow', a, b), '!options->lower_fpow'), # 2^(lg2(a)*b) = a^b
(('fexp', ('fmul', ('flog', a), b)), ('fpow', a, b), '!options->lower_fpow'), # e^(ln(a)*b) = a^b
(('fpow', a, 1.0), a),