[PATCH] D17931: AMDGPU: Materialize sign bits with bfrev

[Matt Arsenault via llvm-commits]

arsenm created this revision.
arsenm added a reviewer: tstellarAMD.
arsenm added a subscriber: llvm-commits.
Herald added a subscriber: arsenm.

If a constant is the same as the reverse of an inline immediate,
this is 4 bytes smaller than having to embed a 32-bit literal.

http://reviews.llvm.org/D17931

Files:
  lib/Target/AMDGPU/SIShrinkInstructions.cpp
  test/CodeGen/AMDGPU/bitreverse-inline-immediates.ll
  test/CodeGen/AMDGPU/fmaxnum.ll
  test/CodeGen/AMDGPU/fminnum.ll
  test/CodeGen/AMDGPU/fneg-fabs.f64.ll
  test/CodeGen/AMDGPU/imm.ll

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