[PATCH] D13003: [DAGCombiner] Improve FMA support for interpolation patterns

[Simon Pilgrim via llvm-commits]

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

This patch adds support for combining patterns such as (FMUL(FADD(1.0, x), y)) and (FMUL(FSUB(x, 1.0), y)) to their FMA equivalents.

This is useful in particular for linear interpolation cases such as (FADD(FMUL(x, t), FMUL(y, FSUB(1.0, t))))

Repository:
  rL LLVM

http://reviews.llvm.org/D13003

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/AMDGPU/llvm.amdgpu.lrp.ll
  test/CodeGen/X86/fma_patterns.ll

-------------- next part --------------
A non-text attachment was scrubbed...
Name: D13003.35206.patch
Type: text/x-patch
Size: 15977 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20150920/f397c675/attachment.bin>