7736c1936a
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
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