[PATCH] D14906: [X86][FMA] Optimize FNEG(FMA) Patterns

[Simon Pilgrim via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: spatel, delena, qcolombet.
RKSimon added a subscriber: llvm-commits.
RKSimon set the repository for this revision to rL LLVM.

X86 needs to use its own FMA opcodes, preventing the standard FNEG(FMA) pattern table recognition method used by other platforms. This patch adds support for lowering FNEG(FMA(X,Y,Z)) into a single suitably negated FMA instruction.

Fix for PR24364

Repository:
  rL LLVM

http://reviews.llvm.org/D14906

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/fma_patterns.ll

-------------- next part --------------
A non-text attachment was scrubbed...
Name: D14906.40878.patch
Type: text/x-patch
Size: 4370 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20151122/89a56379/attachment-0001.bin>