[PATCH] D158173: AMDGPU: Select f64 fmul by negative power of 2 to ldexp

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added reviewers: AMDGPU, foad.
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Select fmul x, -K -> ldexp(-x, log2(fabsK))
Select fmul fabs(x), -K -> ldexp(-|x|, log2(fabsK))


https://reviews.llvm.org/D158173

Files:
  llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp
  llvm/lib/Target/AMDGPU/SIInstructions.td
  llvm/test/CodeGen/AMDGPU/GlobalISel/inst-select-fmul.mir
  llvm/test/CodeGen/AMDGPU/fmul-to-ldexp.ll

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