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nir: lower fexp2(fmul(flog2(a), 2)) to fmul(a, a)

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Similar for the 4 case.

Suggested by Bas.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
This commit is contained in:
Samuel Pitoiset
2018-02-05 15:08:03 +01:00
parent b18997876f
commit 63fb30c674
1 changed files with 2 additions and 0 deletions
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src/compiler/nir/nir_opt_algebraic.py
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@@ -321,6 +321,8 @@ optimizations = [
(('~fexp2', ('fmul', ('flog2', a), b)), ('fpow', a, b), '!options->lower_fpow'), # 2^(lg2(a)*b) = a^b
(('~fexp2', ('fadd', ('fmul', ('flog2', a), b), ('fmul', ('flog2', c), d))),
('~fmul', ('fpow', a, b), ('fpow', c, d)), '!options->lower_fpow'), # 2^(lg2(a) * b + lg2(c) + d) = a^b * c^d
(('~fexp2', ('fmul', ('flog2', a), 2.0)), ('fmul', a, a)),
(('~fexp2', ('fmul', ('flog2', a), 4.0)), ('fmul', ('fmul', a, a), ('fmul', a, a))),
(('~fpow', a, 1.0), a),
(('~fpow', a, 2.0), ('fmul', a, a)),
(('~fpow', a, 4.0), ('fmul', ('fmul', a, a), ('fmul', a, a))),