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