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ee53ec02b6
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
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@259617 91177308-0d34-0410-b5e6-96231b3b80d8
37 lines
1.5 KiB
LLVM
37 lines
1.5 KiB
LLVM
; RUN: llc -fp-contract=fast -O2 < %s | FileCheck %s
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target datalayout = "e-m:e-i64:64-n32:64"
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target triple = "powerpc64le-grtev4-linux-gnu"
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; CHECK-LABEL: f
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; CHECK-NOT: xsmaddmsp [[REG:[0-9]+]], [[REG]], {{[0-9]+}}
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define float @f(float %xf) #0 {
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%1 = fmul float %xf, %xf
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%2 = fmul float %1, 0x3F43FB0140000000
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%3 = fsub float 1.000000e+00, %2
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%4 = fmul float %1, %3
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%5 = fmul float %4, 0x3F461C5440000000
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%6 = fsub float 1.000000e+00, %5
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%7 = fmul float %1, %6
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%8 = fmul float %7, 0x3F4899C100000000
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%9 = fsub float 1.000000e+00, %8
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%10 = fmul float %1, %9
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%11 = fmul float %10, 0x3F4B894020000000
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%12 = fsub float 1.000000e+00, %11
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%13 = fmul float %1, %12
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%14 = fmul float %13, 0x3F4F07C200000000
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%15 = fsub float 1.000000e+00, %14
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%16 = fmul float %1, %15
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%17 = fmul float %16, 0x3F519E0120000000
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%18 = fsub float 1.000000e+00, %17
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%19 = fmul float %1, %18
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%20 = fmul float %19, 0x3F542D6620000000
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%21 = fsub float 1.000000e+00, %20
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%22 = fmul float %1, %21
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%23 = fmul float %22, 0x3F5756CAC0000000
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%24 = fsub float 1.000000e+00, %23
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%25 = fmul float %1, %24
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ret float %25
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}
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attributes #0 = { norecurse nounwind readnone "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="pwr8" "target-features"="+altivec,+bpermd,+crypto,+direct-move,+extdiv,+power8-vector,+vsx,-qpx" "unsafe-fp-math"="false" "use-soft-float"="false" }
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