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clang-p2996/llvm/test/Transforms/InstCombine
Daniil Seredkin 7736c1936a [InstCombine] Missed optimization for pow(x, y) * pow(x, z) with fast-math
If FP reassociation (fast-math) is allowed, then LLVM is free to do the
following transformation pow(x, y) * pow(x, z) -> pow(x, y + z).
This patch adds this transformation and tests for it.
See more https://bugs.llvm.org/show_bug.cgi?id=47205

It handles two cases

1. When operands of fmul are different instructions

%4 = call reassoc float @llvm.pow.f32(float %0, float %1)
%5 = call reassoc float @llvm.pow.f32(float %0, float %2)
%6 = fmul reassoc float %5, %4
-->
%3 = fadd reassoc float %1, %2
%4 = call reassoc float @llvm.pow.f32(float %0, float %3)

2. When operands of fmul are the same instruction

%4 = call reassoc float @llvm.pow.f32(float %0, float %1)
%5 = fmul reassoc float %4, %4
-->
%3 = fadd reassoc float %1, %1
%4 = call reassoc float @llvm.pow.f32(float %0, float %3)

Differential Revision: https://reviews.llvm.org/D102574
2021-06-07 08:08:05 -04:00
..
2021-05-17 14:53:49 -04:00
2021-04-02 13:16:36 -04:00
2020-10-17 12:20:18 -04:00

This directory contains test cases for the instcombine transformation.  The
dated tests are actual bug tests, whereas the named tests are used to test
for features that the this pass should be capable of performing.