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Replace vfmaddxx213 instructions with their 231-type equivalents in accumulator

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loops. Writing back to the accumulator (231-type) allows the coalescer to
eliminate an extra copy.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199933 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Lang Hames
2014-01-23 20:23:36 +00:00
parent b961ae25b4
commit d8f4348cab
4 changed files with 122 additions and 3 deletions
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15
test/CodeGen/X86/fma.ll
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@@ -42,6 +42,21 @@ entry:
ret float %call
}
; Test FMA3 variant selection
; CHECK: fma3_select231:
; CHECK: vfmadd231ss
define float @fma3_select231(float %x, float %y, i32 %N) #0 {
entry:
br label %while.body
while.body: ; preds = %while.body, %while.body
%acc.01 = phi float [ 0.000000e+00, %entry ], [ %acc, %while.body ]
%acc = tail call float @llvm.fma.f32(float %x, float %y, float %acc.01) nounwind readnone
%b = fcmp ueq float %acc, 0.0
br i1 %b, label %while.body, label %while.end
while.end: ; preds = %while.body, %entry
ret float %acc
}
declare float @llvm.fma.f32(float, float, float) nounwind readnone
declare double @llvm.fma.f64(double, double, double) nounwind readnone
declare x86_fp80 @llvm.fma.f80(x86_fp80, x86_fp80, x86_fp80) nounwind readnone