; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mcpu=x86-64 | FileCheck %s ; More than one 'arcp' division using a single divisor operand ; should be converted into a reciprocal and multiplication. ; Don't do anything for just one division. define float @div1_arcp(float %x, float %y, float %z) { ; CHECK-LABEL: div1_arcp: ; CHECK: # %bb.0: ; CHECK-NEXT: divss %xmm1, %xmm0 ; CHECK-NEXT: retq %div1 = fdiv arcp float %x, %y ret float %div1 } ; All math instructions are 'arcp', so optimize. define float @div2_arcp_all(float %x, float %y, float %z) { ; CHECK-LABEL: div2_arcp_all: ; CHECK: # %bb.0: ; CHECK-NEXT: movss {{.*#+}} xmm3 = mem[0],zero,zero,zero ; CHECK-NEXT: divss %xmm2, %xmm3 ; CHECK-NEXT: mulss %xmm3, %xmm0 ; CHECK-NEXT: mulss %xmm1, %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 } ; The first division is not 'arcp', so do not optimize. define float @div2_arcp_partial1(float %x, float %y, float %z) { ; CHECK-LABEL: div2_arcp_partial1: ; CHECK: # %bb.0: ; CHECK-NEXT: divss %xmm2, %xmm0 ; CHECK-NEXT: mulss %xmm1, %xmm0 ; CHECK-NEXT: divss %xmm2, %xmm0 ; CHECK-NEXT: retq %div1 = fdiv float %x, %z %mul = fmul arcp float %div1, %y %div2 = fdiv arcp float %mul, %z ret float %div2 } ; The second division is not 'arcp', so do not optimize. define float @div2_arcp_partial2(float %x, float %y, float %z) { ; CHECK-LABEL: div2_arcp_partial2: ; CHECK: # %bb.0: ; CHECK-NEXT: divss %xmm2, %xmm0 ; CHECK-NEXT: mulss %xmm1, %xmm0 ; CHECK-NEXT: divss %xmm2, %xmm0 ; CHECK-NEXT: retq %div1 = fdiv arcp float %x, %z %mul = fmul arcp float %div1, %y %div2 = fdiv float %mul, %z ret float %div2 } ; The multiply is not 'arcp', but that does not prevent optimizing the divisions. define float @div2_arcp_partial3(float %x, float %y, float %z) { ; CHECK-LABEL: div2_arcp_partial3: ; CHECK: # %bb.0: ; CHECK-NEXT: movss {{.*#+}} xmm3 = mem[0],zero,zero,zero ; CHECK-NEXT: divss %xmm2, %xmm3 ; CHECK-NEXT: mulss %xmm3, %xmm0 ; CHECK-NEXT: mulss %xmm1, %xmm0 ; CHECK-NEXT: mulss %xmm3, %xmm0 ; CHECK-NEXT: retq %div1 = fdiv arcp float %x, %z %mul = fmul 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) { ; 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 float @div_select_constant_fold(i1 zeroext %arg) { ; CHECK-LABEL: div_select_constant_fold: ; CHECK: # %bb.0: ; CHECK-NEXT: testl %edi, %edi ; CHECK-NEXT: jne .LBB6_1 ; CHECK-NEXT: # %bb.2: ; CHECK-NEXT: movss {{.*#+}} xmm0 = mem[0],zero,zero,zero ; CHECK-NEXT: retq ; CHECK-NEXT: .LBB6_1: ; CHECK-NEXT: movss {{.*#+}} xmm0 = mem[0],zero,zero,zero ; CHECK-NEXT: retq %tmp = select i1 %arg, float 5.000000e+00, float 6.000000e+00 %B2 = fdiv float %tmp, 1.000000e+00 ret float %B2 } define float @div_select_constant_fold_zero(i1 zeroext %arg) { ; CHECK-LABEL: div_select_constant_fold_zero: ; CHECK: # %bb.0: ; CHECK-NEXT: testl %edi, %edi ; CHECK-NEXT: jne .LBB7_1 ; CHECK-NEXT: # %bb.2: ; CHECK-NEXT: movss {{.*#+}} xmm0 = mem[0],zero,zero,zero ; CHECK-NEXT: jmp .LBB7_3 ; CHECK-NEXT: .LBB7_1: ; CHECK-NEXT: movss {{.*#+}} xmm0 = mem[0],zero,zero,zero ; CHECK-NEXT: .LBB7_3: ; CHECK-NEXT: xorps %xmm1, %xmm1 ; CHECK-NEXT: divss %xmm1, %xmm0 ; CHECK-NEXT: retq %tmp = select i1 %arg, float 5.000000e+00, float 6.000000e+00 %B2 = fdiv float %tmp, 0.000000e+00 ret float %B2 } define void @PR24141() { ; 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 arcp double %xv0, %xv1 br label %while.body } declare { double, double } @g(double)