llvm/test/Transforms/InstCombine/commutative-operation-over-phis.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
; RUN: opt -passes=instcombine -S < %s | FileCheck %s

declare void @dummy()

declare i32 @llvm.smax.i32(i32 %a, i32 %b)
declare i32 @llvm.smin.i32(i32 %a, i32 %b)
declare i32 @llvm.umax.i32(i32 %a, i32 %b)
declare i32 @llvm.umin.i32(i32 %a, i32 %b)
declare float @llvm.maxnum.f32(float %a, float %b)
declare float @llvm.minnum.f32(float %a, float %b)
declare float @llvm.maximum.f32(float %a, float %b)
declare float @llvm.minimum.f32(float %a, float %b)
declare float @llvm.pow.f32(float %a, float %b)

define i8 @fold_phi_mul(i1 %c, i8 %a, i8 %b)  {
; CHECK-LABEL: define i8 @fold_phi_mul(
; CHECK-SAME: i1 [[C:%.*]], i8 [[A:%.*]], i8 [[B:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C]], label [[THEN:%.*]], label [[END:%.*]]
; CHECK:       then:
; CHECK-NEXT:    call void @dummy()
; CHECK-NEXT:    br label [[END]]
; CHECK:       end:
; CHECK-NEXT:    [[RET:%.*]] = mul i8 [[A]], [[B]]
; CHECK-NEXT:    ret i8 [[RET]]
;
entry:
  br i1 %c, label %then, label %end
then:
  call void @dummy()
  br label %end
end:
  %phi1 = phi i8 [%a, %entry], [%b, %then]
  %phi2 = phi i8 [%b, %entry], [%a, %then]
  %ret = mul i8 %phi1, %phi2
  ret i8 %ret
}

define i8 @fold_phi_mul_three(i1 %c, i1 %d, i8 %a, i8 %b)  {
; CHECK-LABEL: define i8 @fold_phi_mul_three(
; CHECK-SAME: i1 [[C:%.*]], i1 [[D:%.*]], i8 [[A:%.*]], i8 [[B:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C]], label [[THEN1:%.*]], label [[END:%.*]]
; CHECK:       then1:
; CHECK-NEXT:    call void @dummy()
; CHECK-NEXT:    br i1 [[D]], label [[THEN2:%.*]], label [[END]]
; CHECK:       then2:
; CHECK-NEXT:    call void @dummy()
; CHECK-NEXT:    br label [[END]]
; CHECK:       end:
; CHECK-NEXT:    [[RET:%.*]] = mul i8 [[A]], [[B]]
; CHECK-NEXT:    ret i8 [[RET]]
;
entry:
  br i1 %c, label %then1, label %end
then1:
  call void @dummy()
  br i1 %d, label %then2, label %end
then2:
  call void @dummy()
  br label %end
end:
  %phi1 = phi i8 [%a, %entry], [%b, %then1], [%a, %then2]
  %phi2 = phi i8 [%b, %entry], [%a, %then1], [%b, %then2]
  %ret = mul i8 %phi1, %phi2
  ret i8 %ret
}

define i8 @fold_phi_mul_three_notopt(i1 %c, i1 %d, i8 %a, i8 %b)  {
; CHECK-LABEL: define i8 @fold_phi_mul_three_notopt(
; CHECK-SAME: i1 [[C:%.*]], i1 [[D:%.*]], i8 [[A:%.*]], i8 [[B:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C]], label [[THEN1:%.*]], label [[END:%.*]]
; CHECK:       then1:
; CHECK-NEXT:    call void @dummy()
; CHECK-NEXT:    br i1 [[D]], label [[THEN2:%.*]], label [[END]]
; CHECK:       then2:
; CHECK-NEXT:    call void @dummy()
; CHECK-NEXT:    br label [[END]]
; CHECK:       end:
; CHECK-NEXT:    [[PHI1:%.*]] = phi i8 [ [[A]], [[ENTRY:%.*]] ], [ [[B]], [[THEN1]] ], [ [[A]], [[THEN2]] ]
; CHECK-NEXT:    [[PHI2:%.*]] = phi i8 [ [[B]], [[ENTRY]] ], [ [[A]], [[THEN1]] ], [ [[A]], [[THEN2]] ]
; CHECK-NEXT:    [[RET:%.*]] = mul i8 [[PHI1]], [[PHI2]]
; CHECK-NEXT:    ret i8 [[RET]]
;
entry:
  br i1 %c, label %then1, label %end
then1:
  call void @dummy()
  br i1 %d, label %then2, label %end
then2:
  call void @dummy()
  br label %end
end:
  %phi1 = phi i8 [%a, %entry], [%b, %then1], [%a, %then2]
  %phi2 = phi i8 [%b, %entry], [%a, %then1], [%a, %then2]
  %ret = mul i8 %phi1, %phi2
  ret i8 %ret
}

define i8 @fold_phi_mul_nsw_nuw(i1 %c, i8 %a, i8 %b)  {
; CHECK-LABEL: define i8 @fold_phi_mul_nsw_nuw(
; CHECK-SAME: i1 [[C:%.*]], i8 [[A:%.*]], i8 [[B:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C]], label [[THEN:%.*]], label [[END:%.*]]
; CHECK:       then:
; CHECK-NEXT:    call void @dummy()
; CHECK-NEXT:    br label [[END]]
; CHECK:       end:
; CHECK-NEXT:    [[RET:%.*]] = mul nuw nsw i8 [[A]], [[B]]
; CHECK-NEXT:    ret i8 [[RET]]
;
entry:
  br i1 %c, label %then, label %end
then:
  call void @dummy()
  br label %end
end:
  %phi1 = phi i8 [%a, %entry], [%b, %then]
  %phi2 = phi i8 [%b, %entry], [%a, %then]
  %ret = mul nsw nuw i8 %phi1, %phi2
  ret i8 %ret
}

define <2 x i8> @fold_phi_mul_fix_vec(i1 %c, <2 x i8> %a, <2 x i8> %b)  {
; CHECK-LABEL: define <2 x i8> @fold_phi_mul_fix_vec(
; CHECK-SAME: i1 [[C:%.*]], <2 x i8> [[A:%.*]], <2 x i8> [[B:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C]], label [[THEN:%.*]], label [[END:%.*]]
; CHECK:       then:
; CHECK-NEXT:    call void @dummy()
; CHECK-NEXT:    br label [[END]]
; CHECK:       end:
; CHECK-NEXT:    [[RET:%.*]] = mul <2 x i8> [[A]], [[B]]
; CHECK-NEXT:    ret <2 x i8> [[RET]]
;
entry:
  br i1 %c, label %then, label %end
then:
  call void @dummy()
  br label %end
end:
  %phi1 = phi <2 x i8> [%a, %entry], [%b, %then]
  %phi2 = phi <2 x i8> [%b, %entry], [%a, %then]
  %ret = mul <2 x i8> %phi1, %phi2
  ret <2 x i8> %ret
}

define <vscale x 2 x i8> @fold_phi_mul_scale_vec(i1 %c, <vscale x 2 x i8> %a, <vscale x 2 x i8> %b)  {
; CHECK-LABEL: define <vscale x 2 x i8> @fold_phi_mul_scale_vec(
; CHECK-SAME: i1 [[C:%.*]], <vscale x 2 x i8> [[A:%.*]], <vscale x 2 x i8> [[B:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C]], label [[THEN:%.*]], label [[END:%.*]]
; CHECK:       then:
; CHECK-NEXT:    call void @dummy()
; CHECK-NEXT:    br label [[END]]
; CHECK:       end:
; CHECK-NEXT:    [[RET:%.*]] = mul <vscale x 2 x i8> [[A]], [[B]]
; CHECK-NEXT:    ret <vscale x 2 x i8> [[RET]]
;
entry:
  br i1 %c, label %then, label %end
then:
  call void @dummy()
  br label %end
end:
  %phi1 = phi <vscale x 2 x i8> [%a, %entry], [%b, %then]
  %phi2 = phi <vscale x 2 x i8> [%b, %entry], [%a, %then]
  %ret = mul <vscale x 2 x i8> %phi1, %phi2
  ret <vscale x 2 x i8> %ret
}

define i8 @fold_phi_mul_commute(i1 %c, i8 %a, i8 %b)  {
; CHECK-LABEL: define i8 @fold_phi_mul_commute(
; CHECK-SAME: i1 [[C:%.*]], i8 [[A:%.*]], i8 [[B:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C]], label [[THEN:%.*]], label [[END:%.*]]
; CHECK:       then:
; CHECK-NEXT:    call void @dummy()
; CHECK-NEXT:    br label [[END]]
; CHECK:       end:
; CHECK-NEXT:    [[RET:%.*]] = mul i8 [[A]], [[B]]
; CHECK-NEXT:    ret i8 [[RET]]
;
entry:
  br i1 %c, label %then, label %end
then:
  call void @dummy()
  br label %end
end:
  %phi1 = phi i8 [%a, %entry], [%b, %then]
  %phi2 = phi i8 [%a, %then], [%b, %entry]
  %ret = mul i8 %phi1, %phi2
  ret i8 %ret
}


define i8 @fold_phi_mul_notopt(i1 %c, i8 %a, i8 %b, i8 %d)  {
; CHECK-LABEL: define i8 @fold_phi_mul_notopt(
; CHECK-SAME: i1 [[C:%.*]], i8 [[A:%.*]], i8 [[B:%.*]], i8 [[D:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C]], label [[THEN:%.*]], label [[END:%.*]]
; CHECK:       then:
; CHECK-NEXT:    call void @dummy()
; CHECK-NEXT:    br label [[END]]
; CHECK:       end:
; CHECK-NEXT:    [[PHI1:%.*]] = phi i8 [ [[A]], [[ENTRY:%.*]] ], [ [[B]], [[THEN]] ]
; CHECK-NEXT:    [[PHI2:%.*]] = phi i8 [ [[B]], [[ENTRY]] ], [ [[D]], [[THEN]] ]
; CHECK-NEXT:    [[RET:%.*]] = mul i8 [[PHI1]], [[PHI2]]
; CHECK-NEXT:    ret i8 [[RET]]
;
entry:
  br i1 %c, label %then, label %end
then:
  call void @dummy()
  br label %end
end:
  %phi1 = phi i8 [%a, %entry], [%b, %then]
  %phi2 = phi i8 [%b, %entry], [%d, %then]
  %ret = mul i8 %phi1, %phi2
  ret i8 %ret
}


define i8 @fold_phi_sub(i1 %c, i8 %a, i8 %b)  {
; CHECK-LABEL: define i8 @fold_phi_sub(
; CHECK-SAME: i1 [[C:%.*]], i8 [[A:%.*]], i8 [[B:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C]], label [[THEN:%.*]], label [[END:%.*]]
; CHECK:       then:
; CHECK-NEXT:    call void @dummy()
; CHECK-NEXT:    br label [[END]]
; CHECK:       end:
; CHECK-NEXT:    [[PHI1:%.*]] = phi i8 [ [[A]], [[ENTRY:%.*]] ], [ [[B]], [[THEN]] ]
; CHECK-NEXT:    [[PHI2:%.*]] = phi i8 [ [[B]], [[ENTRY]] ], [ [[A]], [[THEN]] ]
; CHECK-NEXT:    [[RET:%.*]] = sub i8 [[PHI1]], [[PHI2]]
; CHECK-NEXT:    ret i8 [[RET]]
;
entry:
  br i1 %c, label %then, label %end
then:
  call void @dummy()
  br label %end
end:
  %phi1 = phi i8 [%a, %entry], [%b, %then]
  %phi2 = phi i8 [%b, %entry], [%a, %then]
  %ret = sub i8 %phi1, %phi2
  ret i8 %ret
}


define i8 @fold_phi_add(i1 %c, i8 %a, i8 %b)  {
; CHECK-LABEL: define i8 @fold_phi_add(
; CHECK-SAME: i1 [[C:%.*]], i8 [[A:%.*]], i8 [[B:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C]], label [[THEN:%.*]], label [[END:%.*]]
; CHECK:       then:
; CHECK-NEXT:    call void @dummy()
; CHECK-NEXT:    br label [[END]]
; CHECK:       end:
; CHECK-NEXT:    [[RET:%.*]] = add i8 [[A]], [[B]]
; CHECK-NEXT:    ret i8 [[RET]]
;
entry:
  br i1 %c, label %then, label %end
then:
  call void @dummy()
  br label %end
end:
  %phi1 = phi i8 [%a, %entry], [%b, %then]
  %phi2 = phi i8 [%b, %entry], [%a, %then]
  %ret = add i8 %phi1, %phi2
  ret i8 %ret
}

define i8 @fold_phi_and(i1 %c, i8 %a, i8 %b)  {
; CHECK-LABEL: define i8 @fold_phi_and(
; CHECK-SAME: i1 [[C:%.*]], i8 [[A:%.*]], i8 [[B:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C]], label [[THEN:%.*]], label [[END:%.*]]
; CHECK:       then:
; CHECK-NEXT:    call void @dummy()
; CHECK-NEXT:    br label [[END]]
; CHECK:       end:
; CHECK-NEXT:    [[RET:%.*]] = and i8 [[A]], [[B]]
; CHECK-NEXT:    ret i8 [[RET]]
;
entry:
  br i1 %c, label %then, label %end
then:
  call void @dummy()
  br label %end
end:
  %phi1 = phi i8 [%a, %entry], [%b, %then]
  %phi2 = phi i8 [%b, %entry], [%a, %then]
  %ret = and i8 %phi1, %phi2
  ret i8 %ret
}

define i8 @fold_phi_or(i1 %c, i8 %a, i8 %b)  {
; CHECK-LABEL: define i8 @fold_phi_or(
; CHECK-SAME: i1 [[C:%.*]], i8 [[A:%.*]], i8 [[B:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C]], label [[THEN:%.*]], label [[END:%.*]]
; CHECK:       then:
; CHECK-NEXT:    call void @dummy()
; CHECK-NEXT:    br label [[END]]
; CHECK:       end:
; CHECK-NEXT:    [[RET:%.*]] = or i8 [[A]], [[B]]
; CHECK-NEXT:    ret i8 [[RET]]
;
entry:
  br i1 %c, label %then, label %end
then:
  call void @dummy()
  br label %end
end:
  %phi1 = phi i8 [%a, %entry], [%b, %then]
  %phi2 = phi i8 [%b, %entry], [%a, %then]
  %ret = or i8 %phi1, %phi2
  ret i8 %ret
}


define i8 @fold_phi_xor(i1 %c, i8 %a, i8 %b)  {
; CHECK-LABEL: define i8 @fold_phi_xor(
; CHECK-SAME: i1 [[C:%.*]], i8 [[A:%.*]], i8 [[B:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C]], label [[THEN:%.*]], label [[END:%.*]]
; CHECK:       then:
; CHECK-NEXT:    call void @dummy()
; CHECK-NEXT:    br label [[END]]
; CHECK:       end:
; CHECK-NEXT:    [[RET:%.*]] = xor i8 [[A]], [[B]]
; CHECK-NEXT:    ret i8 [[RET]]
;
entry:
  br i1 %c, label %then, label %end
then:
  call void @dummy()
  br label %end
end:
  %phi1 = phi i8 [%a, %entry], [%b, %then]
  %phi2 = phi i8 [%b, %entry], [%a, %then]
  %ret = xor i8 %phi1, %phi2
  ret i8 %ret
}


define float @fold_phi_fadd(i1 %c, float %a, float %b)  {
; CHECK-LABEL: define float @fold_phi_fadd(
; CHECK-SAME: i1 [[C:%.*]], float [[A:%.*]], float [[B:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C]], label [[THEN:%.*]], label [[END:%.*]]
; CHECK:       then:
; CHECK-NEXT:    call void @dummy()
; CHECK-NEXT:    br label [[END]]
; CHECK:       end:
; CHECK-NEXT:    [[RET:%.*]] = fadd float [[A]], [[B]]
; CHECK-NEXT:    ret float [[RET]]
;
entry:
  br i1 %c, label %then, label %end
then:
  call void @dummy()
  br label %end
end:
  %phi1 = phi float [%a, %entry], [%b, %then]
  %phi2 = phi float [%b, %entry], [%a, %then]
  %ret = fadd float %phi1, %phi2
  ret float %ret
}

define float @fold_phi_fadd_nnan(i1 %c, float %a, float %b)  {
; CHECK-LABEL: define float @fold_phi_fadd_nnan(
; CHECK-SAME: i1 [[C:%.*]], float [[A:%.*]], float [[B:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C]], label [[THEN:%.*]], label [[END:%.*]]
; CHECK:       then:
; CHECK-NEXT:    call void @dummy()
; CHECK-NEXT:    br label [[END]]
; CHECK:       end:
; CHECK-NEXT:    [[RET:%.*]] = fadd nnan float [[A]], [[B]]
; CHECK-NEXT:    ret float [[RET]]
;
entry:
  br i1 %c, label %then, label %end
then:
  call void @dummy()
  br label %end
end:
  %phi1 = phi float [%a, %entry], [%b, %then]
  %phi2 = phi float [%b, %entry], [%a, %then]
  %ret = fadd nnan float %phi1, %phi2
  ret float %ret
}


define float @fold_phi_fmul(i1 %c, float %a, float %b)  {
; CHECK-LABEL: define float @fold_phi_fmul(
; CHECK-SAME: i1 [[C:%.*]], float [[A:%.*]], float [[B:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C]], label [[THEN:%.*]], label [[END:%.*]]
; CHECK:       then:
; CHECK-NEXT:    call void @dummy()
; CHECK-NEXT:    br label [[END]]
; CHECK:       end:
; CHECK-NEXT:    [[RET:%.*]] = fmul float [[A]], [[B]]
; CHECK-NEXT:    ret float [[RET]]
;
entry:
  br i1 %c, label %then, label %end
then:
  call void @dummy()
  br label %end
end:
  %phi1 = phi float [%a, %entry], [%b, %then]
  %phi2 = phi float [%b, %entry], [%a, %then]
  %ret = fmul float %phi1, %phi2
  ret float %ret
}


define i32 @fold_phi_smax(i1 %c, i32 %a, i32 %b)  {
; CHECK-LABEL: define i32 @fold_phi_smax(
; CHECK-SAME: i1 [[C:%.*]], i32 [[A:%.*]], i32 [[B:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C]], label [[THEN:%.*]], label [[END:%.*]]
; CHECK:       then:
; CHECK-NEXT:    call void @dummy()
; CHECK-NEXT:    br label [[END]]
; CHECK:       end:
; CHECK-NEXT:    [[RET:%.*]] = call i32 @llvm.smax.i32(i32 [[A]], i32 [[B]])
; CHECK-NEXT:    ret i32 [[RET]]
;
entry:
  br i1 %c, label %then, label %end
then:
  call void @dummy()
  br label %end
end:
  %phi1 = phi i32 [%a, %entry], [%b, %then]
  %phi2 = phi i32 [%b, %entry], [%a, %then]
  %ret = call i32 @llvm.smax.i32(i32  %phi1, i32 %phi2)
  ret i32 %ret
}


define i32 @fold_phi_smin(i1 %c, i32 %a, i32 %b)  {
; CHECK-LABEL: define i32 @fold_phi_smin(
; CHECK-SAME: i1 [[C:%.*]], i32 [[A:%.*]], i32 [[B:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C]], label [[THEN:%.*]], label [[END:%.*]]
; CHECK:       then:
; CHECK-NEXT:    call void @dummy()
; CHECK-NEXT:    br label [[END]]
; CHECK:       end:
; CHECK-NEXT:    [[RET:%.*]] = call i32 @llvm.smin.i32(i32 [[A]], i32 [[B]])
; CHECK-NEXT:    ret i32 [[RET]]
;
entry:
  br i1 %c, label %then, label %end
then:
  call void @dummy()
  br label %end
end:
  %phi1 = phi i32 [%a, %entry], [%b, %then]
  %phi2 = phi i32 [%b, %entry], [%a, %then]
  %ret = call i32 @llvm.smin.i32(i32  %phi1, i32 %phi2)
  ret i32 %ret
}


define i32 @fold_phi_umax(i1 %c, i32 %a, i32 %b)  {
; CHECK-LABEL: define i32 @fold_phi_umax(
; CHECK-SAME: i1 [[C:%.*]], i32 [[A:%.*]], i32 [[B:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C]], label [[THEN:%.*]], label [[END:%.*]]
; CHECK:       then:
; CHECK-NEXT:    call void @dummy()
; CHECK-NEXT:    br label [[END]]
; CHECK:       end:
; CHECK-NEXT:    [[RET:%.*]] = call i32 @llvm.umax.i32(i32 [[A]], i32 [[B]])
; CHECK-NEXT:    ret i32 [[RET]]
;
entry:
  br i1 %c, label %then, label %end
then:
  call void @dummy()
  br label %end
end:
  %phi1 = phi i32 [%a, %entry], [%b, %then]
  %phi2 = phi i32 [%b, %entry], [%a, %then]
  %ret = call i32 @llvm.umax.i32(i32  %phi1, i32 %phi2)
  ret i32 %ret
}

define i32 @fold_phi_umin(i1 %c, i32 %a, i32 %b)  {
; CHECK-LABEL: define i32 @fold_phi_umin(
; CHECK-SAME: i1 [[C:%.*]], i32 [[A:%.*]], i32 [[B:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C]], label [[THEN:%.*]], label [[END:%.*]]
; CHECK:       then:
; CHECK-NEXT:    call void @dummy()
; CHECK-NEXT:    br label [[END]]
; CHECK:       end:
; CHECK-NEXT:    [[RET:%.*]] = call i32 @llvm.umin.i32(i32 [[A]], i32 [[B]])
; CHECK-NEXT:    ret i32 [[RET]]
;
entry:
  br i1 %c, label %then, label %end
then:
  call void @dummy()
  br label %end
end:
  %phi1 = phi i32 [%a, %entry], [%b, %then]
  %phi2 = phi i32 [%b, %entry], [%a, %then]
  %ret = call i32 @llvm.umin.i32(i32  %phi1, i32 %phi2)
  ret i32 %ret
}


define float @fold_phi_maxnum(i1 %c, float %a, float %b)  {
; CHECK-LABEL: define float @fold_phi_maxnum(
; CHECK-SAME: i1 [[C:%.*]], float [[A:%.*]], float [[B:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C]], label [[THEN:%.*]], label [[END:%.*]]
; CHECK:       then:
; CHECK-NEXT:    call void @dummy()
; CHECK-NEXT:    br label [[END]]
; CHECK:       end:
; CHECK-NEXT:    [[RET:%.*]] = call float @llvm.maxnum.f32(float [[A]], float [[B]])
; CHECK-NEXT:    ret float [[RET]]
;
entry:
  br i1 %c, label %then, label %end
then:
  call void @dummy()
  br label %end
end:
  %phi1 = phi float [%a, %entry], [%b, %then]
  %phi2 = phi float [%b, %entry], [%a, %then]
  %ret = call float @llvm.maxnum.f32(float  %phi1, float %phi2)
  ret float %ret
}

define float @fold_phi_pow(i1 %c, float %a, float %b)  {
; CHECK-LABEL: define float @fold_phi_pow(
; CHECK-SAME: i1 [[C:%.*]], float [[A:%.*]], float [[B:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C]], label [[THEN:%.*]], label [[END:%.*]]
; CHECK:       then:
; CHECK-NEXT:    call void @dummy()
; CHECK-NEXT:    br label [[END]]
; CHECK:       end:
; CHECK-NEXT:    [[PHI1:%.*]] = phi float [ [[A]], [[ENTRY:%.*]] ], [ [[B]], [[THEN]] ]
; CHECK-NEXT:    [[PHI2:%.*]] = phi float [ [[B]], [[ENTRY]] ], [ [[A]], [[THEN]] ]
; CHECK-NEXT:    [[RET:%.*]] = call float @llvm.pow.f32(float [[PHI1]], float [[PHI2]])
; CHECK-NEXT:    ret float [[RET]]
;
entry:
  br i1 %c, label %then, label %end
then:
  call void @dummy()
  br label %end
end:
  %phi1 = phi float [%a, %entry], [%b, %then]
  %phi2 = phi float [%b, %entry], [%a, %then]
  %ret = call float @llvm.pow.f32(float  %phi1, float %phi2)
  ret float %ret
}

define float @fold_phi_minnum(i1 %c, float %a, float %b)  {
; CHECK-LABEL: define float @fold_phi_minnum(
; CHECK-SAME: i1 [[C:%.*]], float [[A:%.*]], float [[B:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C]], label [[THEN:%.*]], label [[END:%.*]]
; CHECK:       then:
; CHECK-NEXT:    call void @dummy()
; CHECK-NEXT:    br label [[END]]
; CHECK:       end:
; CHECK-NEXT:    [[RET:%.*]] = call float @llvm.minnum.f32(float [[A]], float [[B]])
; CHECK-NEXT:    ret float [[RET]]
;
entry:
  br i1 %c, label %then, label %end
then:
  call void @dummy()
  br label %end
end:
  %phi1 = phi float [%a, %entry], [%b, %then]
  %phi2 = phi float [%b, %entry], [%a, %then]
  %ret = call float @llvm.minnum.f32(float  %phi1, float %phi2)
  ret float %ret
}

define float @fold_phi_maximum(i1 %c, float %a, float %b)  {
; CHECK-LABEL: define float @fold_phi_maximum(
; CHECK-SAME: i1 [[C:%.*]], float [[A:%.*]], float [[B:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C]], label [[THEN:%.*]], label [[END:%.*]]
; CHECK:       then:
; CHECK-NEXT:    call void @dummy()
; CHECK-NEXT:    br label [[END]]
; CHECK:       end:
; CHECK-NEXT:    [[RET:%.*]] = call float @llvm.maximum.f32(float [[A]], float [[B]])
; CHECK-NEXT:    ret float [[RET]]
;
entry:
  br i1 %c, label %then, label %end
then:
  call void @dummy()
  br label %end
end:
  %phi1 = phi float [%a, %entry], [%b, %then]
  %phi2 = phi float [%b, %entry], [%a, %then]
  %ret = call float @llvm.maximum.f32(float  %phi1, float %phi2)
  ret float %ret
}

define float @fold_phi_minimum(i1 %c, float %a, float %b)  {
; CHECK-LABEL: define float @fold_phi_minimum(
; CHECK-SAME: i1 [[C:%.*]], float [[A:%.*]], float [[B:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C]], label [[THEN:%.*]], label [[END:%.*]]
; CHECK:       then:
; CHECK-NEXT:    call void @dummy()
; CHECK-NEXT:    br label [[END]]
; CHECK:       end:
; CHECK-NEXT:    [[RET:%.*]] = call float @llvm.minimum.f32(float [[A]], float [[B]])
; CHECK-NEXT:    ret float [[RET]]
;
entry:
  br i1 %c, label %then, label %end
then:
  call void @dummy()
  br label %end
end:
  %phi1 = phi float [%a, %entry], [%b, %then]
  %phi2 = phi float [%b, %entry], [%a, %then]
  %ret = call float @llvm.minimum.f32(float  %phi1, float %phi2)
  ret float %ret
}