[PATCH] D16663: Codegen: [PPC] Fix PPCVSXFMAMutate to handle duplicates.

[Kyle Butt via llvm-commits]

iteratee created this revision.
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The purpose of PPCVSXFMAMutate is to elide copies by changing FMA forms
on PPC.

    %vreg6<def> = COPY %vreg96
    %vreg6<def,tied1> = XSMADDASP %vreg6<tied0>, %vreg5<kill>, %vreg7
    ;v6 = v6 + v5 * v7

is replaced by

    %vreg5<def,tied1> = XSMADDMSP %vreg5<tied0>, %vreg7, %vreg96
    ;v5 = v5 * v7 + v96

This was broken in the case where the target register was also used as a
multiplicand. Fix this case by checking for it and replacing both uses
with the copied register.

    %vreg6<def> = COPY %vreg96
    %vreg6<def,tied1> = XSMADDASP %vreg6<tied0>, %vreg5<kill>, %vreg6
    ;v6 = v6 + v5 * v6

is replaced by

    %vreg5<def,tied1> = XSMADDMSP %vreg5<tied0>, %vreg96, %vreg96
    ;v5 = v5 * v96 + v96


Repository:
  rL LLVM

http://reviews.llvm.org/D16663

Files:
  lib/Target/PowerPC/PPCVSXFMAMutate.cpp
  test/CodeGen/PowerPC/fma-mutate-duplicate-vreg.ll

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