[PATCH] D26855: New unsafe-fp-math implementation for X86 target

[Andrew V. Tischenko via Phabricator via llvm-commits]

avt77 updated this revision to Diff 86042.
avt77 added a comment.

I updated recip-fastmath2.ll test accordingly to Simon recommendations. Now it includes special checks for different CPUs: SandyBridge, Haswell and btver2. These new checks demonstrate that alternative sequence of instructions is being selected when it's really cheaper than the single fdiv instruction. (Obviously we should change cost numbers for SandyBridge because they are too small.)


https://reviews.llvm.org/D26855

Files:
  include/llvm/CodeGen/MachineCombinerPattern.h
  lib/CodeGen/MachineCombiner.cpp
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  lib/Target/X86/X86InstrInfo.cpp
  lib/Target/X86/X86InstrInfo.h
  test/CodeGen/X86/recip-fastmath.ll
  test/CodeGen/X86/recip-fastmath2.ll

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