1 ; RUN: llc < %s -mtriple=x86_64-unknown-unknown -enable-unsafe-fp-math | FileCheck %s
3 define double @exact(double %x) {
4 ; Exact division by a constant converted to multiplication.
7 ; CHECK-NEXT: mulsd {{.*}}(%rip), %xmm0
9 %div = fdiv double %x, 2.0
13 define double @inexact(double %x) {
14 ; Inexact division by a constant converted to multiplication.
15 ; CHECK-LABEL: inexact:
17 ; CHECK-NEXT: mulsd {{.*}}(%rip), %xmm0
19 %div = fdiv double %x, 0x41DFFFFFFFC00000
23 define double @funky(double %x) {
24 ; No conversion to multiplication if too funky.
27 ; CHECK-NEXT: xorpd %xmm1, %xmm1
28 ; CHECK-NEXT: divsd %xmm1, %xmm0
30 %div = fdiv double %x, 0.0
34 define double @denormal1(double %x) {
35 ; Don't generate multiplication by a denormal.
36 ; CHECK-LABEL: denormal1:
38 ; CHECK-NEXT: divsd {{.*}}(%rip), %xmm0
40 %div = fdiv double %x, 0x7FD0000000000001
44 define double @denormal2(double %x) {
45 ; Don't generate multiplication by a denormal.
46 ; CHECK-LABEL: denormal2:
48 ; CHECK-NEXT: divsd {{.*}}(%rip), %xmm0
50 %div = fdiv double %x, 0x7FEFFFFFFFFFFFFF
54 ; Deleting the negates does not require unsafe-fp-math.
56 define float @double_negative(float %x, float %y) #0 {
57 ; CHECK-LABEL: double_negative:
59 ; CHECK-NEXT: divss %xmm1, %xmm0
61 %neg1 = fsub float -0.0, %x
62 %neg2 = fsub float -0.0, %y
63 %div = fdiv float %neg1, %neg2
67 attributes #0 = { "unsafe-fp-math"="false" }