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32 lines
993 B
LLVM
32 lines
993 B
LLVM
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; RUN: llc < %s -mtriple=x86_64-unknown-unknown | FileCheck %s
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; Anything more than one division using a single divisor operand
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; should be converted into a reciprocal and multiplication.
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define float @div1_arcp(float %x, float %y, float %z) #0 {
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; CHECK-LABEL: div1_arcp:
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; CHECK: # BB#0:
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; CHECK-NEXT: divss %xmm1, %xmm0
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; CHECK-NEXT: retq
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%div1 = fdiv arcp float %x, %y
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ret float %div1
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}
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define float @div2_arcp(float %x, float %y, float %z) #0 {
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; CHECK-LABEL: div2_arcp:
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; CHECK: # BB#0:
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; CHECK-NEXT: movss {{.*#+}} xmm3 = mem[0],zero,zero,zero
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; CHECK-NEXT: divss %xmm2, %xmm3
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; CHECK-NEXT: mulss %xmm3, %xmm0
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; CHECK-NEXT: mulss %xmm1, %xmm0
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; CHECK-NEXT: mulss %xmm3, %xmm0
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; CHECK-NEXT: retq
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%div1 = fdiv arcp float %x, %z
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%mul = fmul arcp float %div1, %y
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%div2 = fdiv arcp float %mul, %z
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ret float %div2
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}
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; FIXME: If the backend understands 'arcp', then this attribute is unnecessary.
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attributes #0 = { "unsafe-fp-math"="true" }
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