| ; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mcpu=x86-64 | FileCheck %s |
| |
| ; Anything more than one division using a single divisor operand |
| ; should be converted into a reciprocal and multiplication. |
| |
| define float @div1_arcp(float %x, float %y, float %z) #0 { |
| ; CHECK-LABEL: div1_arcp: |
| ; CHECK: # BB#0: |
| ; CHECK-NEXT: divss %xmm1, %xmm0 |
| ; CHECK-NEXT: retq |
| %div1 = fdiv arcp float %x, %y |
| ret float %div1 |
| } |
| |
| define float @div2_arcp(float %x, float %y, float %z) #0 { |
| ; CHECK-LABEL: div2_arcp: |
| ; CHECK: # BB#0: |
| ; CHECK-NEXT: movss {{.*#+}} xmm3 = mem[0],zero,zero,zero |
| ; CHECK-NEXT: divss %xmm2, %xmm3 |
| ; CHECK-NEXT: mulss %xmm1, %xmm0 |
| ; CHECK-NEXT: mulss %xmm3, %xmm0 |
| ; CHECK-NEXT: mulss %xmm3, %xmm0 |
| ; CHECK-NEXT: retq |
| %div1 = fdiv arcp float %x, %z |
| %mul = fmul arcp float %div1, %y |
| %div2 = fdiv arcp float %mul, %z |
| ret float %div2 |
| } |
| |
| ; If the reciprocal is already calculated, we should not |
| ; generate an extra multiplication by 1.0. |
| |
| define double @div3_arcp(double %x, double %y, double %z) #0 { |
| ; CHECK-LABEL: div3_arcp: |
| ; CHECK: # BB#0: |
| ; CHECK-NEXT: movsd{{.*#+}} xmm2 = mem[0],zero |
| ; CHECK-NEXT: divsd %xmm1, %xmm2 |
| ; CHECK-NEXT: mulsd %xmm2, %xmm0 |
| ; CHECK-NEXT: addsd %xmm2, %xmm0 |
| ; CHECK-NEXT: retq |
| %div1 = fdiv fast double 1.0, %y |
| %div2 = fdiv fast double %x, %y |
| %ret = fadd fast double %div2, %div1 |
| ret double %ret |
| } |
| |
| define void @PR24141() #0 { |
| ; CHECK-LABEL: PR24141: |
| ; CHECK: callq |
| ; CHECK-NEXT: divsd |
| ; CHECK-NEXT: jmp |
| entry: |
| br label %while.body |
| |
| while.body: |
| %x.0 = phi double [ undef, %entry ], [ %div, %while.body ] |
| %call = call { double, double } @g(double %x.0) |
| %xv0 = extractvalue { double, double } %call, 0 |
| %xv1 = extractvalue { double, double } %call, 1 |
| %div = fdiv double %xv0, %xv1 |
| br label %while.body |
| } |
| |
| declare { double, double } @g(double) |
| |
| ; FIXME: If the backend understands 'arcp', then this attribute is unnecessary. |
| attributes #0 = { "unsafe-fp-math"="true" } |