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5c895f97e3
This problem is bigger than just fsub, but this is the minimum fix to solve fneg for PR20556 ( http://llvm.org/bugs/show_bug.cgi?id=20556 ), and we solve zero subtraction with the same change. llvm-svn: 217286
24 lines
680 B
LLVM
24 lines
680 B
LLVM
; RUN: llc < %s -enable-unsafe-fp-math -mtriple=x86_64-unknown-unknown -mcpu=corei7 | FileCheck %s
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; Make sure that vectors get the same benefits as scalars when using unsafe-fp-math.
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; Subtracting zero is free.
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define <4 x float> @vec_fsub_zero(<4 x float> %x) {
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; CHECK-LABEL: vec_fsub_zero:
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; CHECK-NOT: subps
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; CHECK-NOT: xorps
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; CHECK: retq
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%sub = fsub <4 x float> %x, zeroinitializer
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ret <4 x float> %sub
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}
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; Negating doesn't require subtraction.
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define <4 x float> @vec_fneg(<4 x float> %x) {
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; CHECK-LABEL: vec_fneg:
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; CHECK: xorps {{.*}}LCP{{.*}}, %xmm0
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; CHECK-NOT: subps
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; CHECK-NEXT: retq
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%sub = fsub <4 x float> zeroinitializer, %x
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ret <4 x float> %sub
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}
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