69 lines
1.8 KiB
LLVM
69 lines
1.8 KiB
LLVM
; RUN: llc < %s -mtriple=x86_64-unknown-unknown -enable-unsafe-fp-math | FileCheck %s
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define double @exact(double %x) {
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; Exact division by a constant converted to multiplication.
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; CHECK-LABEL: exact:
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; CHECK: # BB#0:
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; CHECK-NEXT: mulsd {{.*}}(%rip), %xmm0
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; CHECK-NEXT: retq
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%div = fdiv double %x, 2.0
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ret double %div
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}
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define double @inexact(double %x) {
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; Inexact division by a constant converted to multiplication.
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; CHECK-LABEL: inexact:
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; CHECK: # BB#0:
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; CHECK-NEXT: mulsd {{.*}}(%rip), %xmm0
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; CHECK-NEXT: retq
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%div = fdiv double %x, 0x41DFFFFFFFC00000
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ret double %div
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}
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define double @funky(double %x) {
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; No conversion to multiplication if too funky.
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; CHECK-LABEL: funky:
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; CHECK: # BB#0:
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; CHECK-NEXT: xorpd %xmm1, %xmm1
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; CHECK-NEXT: divsd %xmm1, %xmm0
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; CHECK-NEXT: retq
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%div = fdiv double %x, 0.0
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ret double %div
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}
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define double @denormal1(double %x) {
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; Don't generate multiplication by a denormal.
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; CHECK-LABEL: denormal1:
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; CHECK: # BB#0:
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; CHECK-NEXT: divsd {{.*}}(%rip), %xmm0
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; CHECK-NEXT: retq
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%div = fdiv double %x, 0x7FD0000000000001
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ret double %div
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}
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define double @denormal2(double %x) {
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; Don't generate multiplication by a denormal.
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; CHECK-LABEL: denormal2:
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; CHECK: # BB#0:
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; CHECK-NEXT: divsd {{.*}}(%rip), %xmm0
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; CHECK-NEXT: retq
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%div = fdiv double %x, 0x7FEFFFFFFFFFFFFF
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ret double %div
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}
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; Deleting the negates does not require unsafe-fp-math.
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define float @double_negative(float %x, float %y) #0 {
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; CHECK-LABEL: double_negative:
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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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%neg1 = fsub float -0.0, %x
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%neg2 = fsub float -0.0, %y
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%div = fdiv float %neg1, %neg2
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ret float %div
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}
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attributes #0 = { "unsafe-fp-math"="false" }
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