Codebase Browser
llvm
Go to App

llvm/llvm/test/Transforms/InstCombine/select-binop-cmp.ll 

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

declare void @use(<2 x i1>)
declare void @use2(i1)
declare void @use.i32(i32)

define i32 @select_xor_icmp(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_xor_icmp(
; CHECK-NEXT:    [[A:%.*]] = icmp eq i32 [[X:%.*]], 0
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], i32 [[Z:%.*]], i32 [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp eq i32 %x, 0
  %B = xor i32 %x, %z
  %C = select i1 %A, i32 %B, i32 %y
  ret i32 %C
}

define i32 @select_xor_icmp2(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_xor_icmp2(
; CHECK-NEXT:    [[A_NOT:%.*]] = icmp eq i32 [[X:%.*]], 0
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A_NOT]], i32 [[Z:%.*]], i32 [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp ne i32 %x, 0
  %B = xor i32 %x, %z
  %C = select i1 %A, i32 %y, i32 %B
  ret i32 %C
}

define i32 @select_xor_icmp_meta(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_xor_icmp_meta(
; CHECK-NEXT:    [[A:%.*]] = icmp eq i32 [[X:%.*]], 0
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], i32 [[Z:%.*]], i32 [[Y:%.*]], !prof [[PROF0:![0-9]+]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp eq i32 %x, 0
  %B = xor i32 %x, %z
  %C = select i1 %A, i32 %B, i32 %y, !prof !0
  ret i32 %C
}

define i32 @select_mul_icmp(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_mul_icmp(
; CHECK-NEXT:    [[A:%.*]] = icmp eq i32 [[X:%.*]], 1
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], i32 [[Z:%.*]], i32 [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp eq i32 %x, 1
  %B = mul i32 %x, %z
  %C = select i1 %A, i32 %B, i32 %y
  ret i32 %C
}

define i32 @select_add_icmp(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_add_icmp(
; CHECK-NEXT:    [[A:%.*]] = icmp eq i32 [[X:%.*]], 0
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], i32 [[Z:%.*]], i32 [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp eq i32 %x, 0
  %B = add i32 %x, %z
  %C = select i1 %A, i32 %B, i32 %y
  ret i32 %C
}

define i32 @select_or_icmp(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_or_icmp(
; CHECK-NEXT:    [[A:%.*]] = icmp eq i32 [[X:%.*]], 0
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], i32 [[Z:%.*]], i32 [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp eq i32 %x, 0
  %B = or i32 %x, %z
  %C = select i1 %A, i32 %B, i32 %y
  ret i32 %C
}

define i32 @select_and_icmp(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_and_icmp(
; CHECK-NEXT:    [[A:%.*]] = icmp eq i32 [[X:%.*]], -1
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], i32 [[Z:%.*]], i32 [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp eq i32 %x, -1
  %B = and i32 %x, %z
  %C = select i1 %A, i32 %B, i32 %y
  ret i32 %C
}

define <2 x i8> @select_xor_icmp_vec(<2 x i8> %x, <2 x i8> %y, <2 x i8> %z) {
; CHECK-LABEL: @select_xor_icmp_vec(
; CHECK-NEXT:    [[A:%.*]] = icmp eq <2 x i8> [[X:%.*]], zeroinitializer
; CHECK-NEXT:    [[C:%.*]] = select <2 x i1> [[A]], <2 x i8> [[Z:%.*]], <2 x i8> [[Y:%.*]]
; CHECK-NEXT:    ret <2 x i8> [[C]]
;
  %A = icmp eq <2 x i8>  %x, <i8 0, i8 0>
  %B = xor <2 x i8>  %x, %z
  %C = select <2 x i1>  %A, <2 x i8>  %B, <2 x i8>  %y
  ret <2 x i8>  %C
}

define <2 x i8> @select_xor_icmp_vec_use(<2 x i8> %x, <2 x i8> %y, <2 x i8> %z) {
; CHECK-LABEL: @select_xor_icmp_vec_use(
; CHECK-NEXT:    [[A:%.*]] = icmp ne <2 x i8> [[X:%.*]], zeroinitializer
; CHECK-NEXT:    call void @use(<2 x i1> [[A]])
; CHECK-NEXT:    [[C:%.*]] = select <2 x i1> [[A]], <2 x i8> [[Y:%.*]], <2 x i8> [[Z:%.*]]
; CHECK-NEXT:    ret <2 x i8> [[C]]
;
  %A = icmp ne <2 x i8>  %x, <i8 0, i8 0>
  call void @use(<2 x i1> %A)
  %B = xor <2 x i8>  %x, %z
  %C = select <2 x i1>  %A, <2 x i8>  %y, <2 x i8>  %B
  ret <2 x i8>  %C
}

define i32 @select_xor_inv_icmp(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_xor_inv_icmp(
; CHECK-NEXT:    [[A:%.*]] = icmp eq i32 [[X:%.*]], 0
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], i32 [[Z:%.*]], i32 [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp eq i32 %x, 0
  %B = xor i32 %z, %x
  %C = select i1 %A, i32 %B, i32 %y
  ret i32 %C
}

define i32 @select_xor_inv_icmp2(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_xor_inv_icmp2(
; CHECK-NEXT:    [[A:%.*]] = icmp ne i32 [[X:%.*]], 0
; CHECK-NEXT:    call void @use2(i1 [[A]])
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], i32 [[Y:%.*]], i32 [[Z:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp ne i32 %x, 0
  call void @use2(i1 %A) ; thwart predicate canonicalization
  %B = xor i32 %x, %z
  %C = select i1 %A, i32 %y, i32 %B
  ret i32 %C
}

define float @select_fadd_fcmp(float %x, float %y, float %z) {
; CHECK-LABEL: @select_fadd_fcmp(
; CHECK-NEXT:    [[A:%.*]] = fcmp oeq float [[X:%.*]], 0.000000e+00
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[Z:%.*]], float [[Y:%.*]]
; CHECK-NEXT:    ret float [[C]]
;
  %A = fcmp oeq float %x, -0.0
  %B = fadd nsz float %x, %z
  %C = select i1 %A, float %B, float %y
  ret float %C
}

; This is logically equivalent to the previous test - fcmp ignores the sign of 0.0.

define float @select_fadd_fcmp_poszero(float %x, float %y, float %z) {
; CHECK-LABEL: @select_fadd_fcmp_poszero(
; CHECK-NEXT:    [[A:%.*]] = fcmp oeq float [[X:%.*]], 0.000000e+00
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[Z:%.*]], float [[Y:%.*]]
; CHECK-NEXT:    ret float [[C]]
;
  %A = fcmp oeq float %x, 0.0
  %B = fadd nsz float %z, %x
  %C = select i1 %A, float %B, float %y
  ret float %C
}

define float @select_fadd_fcmp_2(float %x, float %y, float %v) {
; CHECK-LABEL: @select_fadd_fcmp_2(
; CHECK-NEXT:    [[A:%.*]] = fcmp une float [[X:%.*]], 0.000000e+00
; CHECK-NEXT:    [[Z:%.*]] = fadd float [[V:%.*]], 0.000000e+00
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[Y:%.*]], float [[Z]]
; CHECK-NEXT:    ret float [[C]]
;
  %A = fcmp une float %x, -0.0
  %z = fadd float %v, 0.0 ; cannot produce -0.0
  %B = fadd float %z, %x
  %C = select i1 %A, float %y, float %B
  ret float %C
}

; This is logically equivalent to the previous test - fcmp ignores the sign of 0.0.

define float @select_fadd_fcmp_2_poszero(float %x, float %y, float %v) {
; CHECK-LABEL: @select_fadd_fcmp_2_poszero(
; CHECK-NEXT:    [[A:%.*]] = fcmp une float [[X:%.*]], 0.000000e+00
; CHECK-NEXT:    [[Z:%.*]] = fadd float [[V:%.*]], 0.000000e+00
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[Y:%.*]], float [[Z]]
; CHECK-NEXT:    ret float [[C]]
;
  %A = fcmp une float %x, 0.0
  %z = fadd float %v, 0.0 ; cannot produce -0.0
  %B = fadd float %z, %x
  %C = select i1 %A, float %y, float %B
  ret float %C
}

define float @select_fadd_fcmp_3(float %x, float %y) {
; CHECK-LABEL: @select_fadd_fcmp_3(
; CHECK-NEXT:    [[A:%.*]] = fcmp une float [[X:%.*]], 0.000000e+00
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[Y:%.*]], float 6.000000e+00
; CHECK-NEXT:    ret float [[C]]
;
  %A = fcmp une float %x, -0.0
  %B = fadd float 6.0, %x
  %C = select i1 %A, float %y, float %B
  ret float %C
}

; This is logically equivalent to the previous test - fcmp ignores the sign of 0.0.

define float @select_fadd_fcmp_3_poszero(float %x, float %y) {
; CHECK-LABEL: @select_fadd_fcmp_3_poszero(
; CHECK-NEXT:    [[A:%.*]] = fcmp une float [[X:%.*]], 0.000000e+00
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[Y:%.*]], float 6.000000e+00
; CHECK-NEXT:    ret float [[C]]
;
  %A = fcmp une float %x, 0.0
  %B = fadd float 6.0, %x
  %C = select i1 %A, float %y, float %B
  ret float %C
}

define float @select_fadd_fcmp_4(float %x, float %y, float %z) {
; CHECK-LABEL: @select_fadd_fcmp_4(
; CHECK-NEXT:    [[A:%.*]] = fcmp une float [[X:%.*]], 0.000000e+00
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[Y:%.*]], float [[Z:%.*]]
; CHECK-NEXT:    ret float [[C]]
;
  %A = fcmp une float %x, -0.0
  %B = fadd nsz float %z, %x
  %C = select i1 %A, float %y, float %B
  ret float %C
}

; This is logically equivalent to the previous test - fcmp ignores the sign of 0.0.

define float @select_fadd_fcmp_4_poszero(float %x, float %y, float %z) {
; CHECK-LABEL: @select_fadd_fcmp_4_poszero(
; CHECK-NEXT:    [[A:%.*]] = fcmp une float [[X:%.*]], 0.000000e+00
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[Y:%.*]], float [[Z:%.*]]
; CHECK-NEXT:    ret float [[C]]
;
  %A = fcmp une float %x, 0.0
  %B = fadd nsz float %z, %x
  %C = select i1 %A, float %y, float %B
  ret float %C
}

define float @select_fadd_fcmp_5(float %x, float %y, float %v) {
; CHECK-LABEL: @select_fadd_fcmp_5(
; CHECK-NEXT:    [[A:%.*]] = fcmp oeq float [[X:%.*]], 0.000000e+00
; CHECK-NEXT:    [[Z:%.*]] = fadd float [[V:%.*]], 0.000000e+00
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[Z]], float [[Y:%.*]]
; CHECK-NEXT:    ret float [[C]]
;
  %A = fcmp oeq float %x, -0.0
  %z = fadd float %v, 0.0 ; cannot produce -0.0
  %B = fadd float %z, %x
  %C = select i1 %A, float %B, float %y
  ret float %C
}

; This is logically equivalent to the previous test - fcmp ignores the sign of 0.0.

define float @select_fadd_fcmp_5_poszero(float %x, float %y, float %v) {
; CHECK-LABEL: @select_fadd_fcmp_5_poszero(
; CHECK-NEXT:    [[A:%.*]] = fcmp oeq float [[X:%.*]], 0.000000e+00
; CHECK-NEXT:    [[Z:%.*]] = fadd float [[V:%.*]], 0.000000e+00
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[Z]], float [[Y:%.*]]
; CHECK-NEXT:    ret float [[C]]
;
  %A = fcmp oeq float %x, 0.0
  %z = fadd float %v, 0.0 ; cannot produce -0.0
  %B = fadd float %z, %x
  %C = select i1 %A, float %B, float %y
  ret float %C
}

define float @select_fadd_fcmp_6(float %x, float %y, float %z) {
; CHECK-LABEL: @select_fadd_fcmp_6(
; CHECK-NEXT:    [[A:%.*]] = fcmp oeq float [[X:%.*]], 0.000000e+00
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float 6.000000e+00, float [[Y:%.*]]
; CHECK-NEXT:    ret float [[C]]
;
  %A = fcmp oeq float %x, -0.0
  %B = fadd float %x, 6.0
  %C = select i1 %A, float %B, float %y
  ret float %C
}

; This is logically equivalent to the previous test - fcmp ignores the sign of 0.0.

define float @select_fadd_fcmp_6_poszero(float %x, float %y, float %z) {
; CHECK-LABEL: @select_fadd_fcmp_6_poszero(
; CHECK-NEXT:    [[A:%.*]] = fcmp oeq float [[X:%.*]], 0.000000e+00
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float 6.000000e+00, float [[Y:%.*]]
; CHECK-NEXT:    ret float [[C]]
;
  %A = fcmp oeq float %x, 0.0
  %B = fadd float %x, 6.0
  %C = select i1 %A, float %B, float %y
  ret float %C
}

define float @select_fmul_fcmp(float %x, float %y, float %z) {
; CHECK-LABEL: @select_fmul_fcmp(
; CHECK-NEXT:    [[A:%.*]] = fcmp oeq float [[X:%.*]], 1.000000e+00
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[Z:%.*]], float [[Y:%.*]]
; CHECK-NEXT:    ret float [[C]]
;
  %A = fcmp oeq float %x, 1.0
  %B = fmul nsz float %x, %z
  %C = select i1 %A, float %B, float %y
  ret float %C
}

define float @select_fsub_fcmp(float %x, float %y, float %z) {
; CHECK-LABEL: @select_fsub_fcmp(
; CHECK-NEXT:    [[A:%.*]] = fcmp oeq float [[X:%.*]], 0.000000e+00
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[Z:%.*]], float [[Y:%.*]]
; CHECK-NEXT:    ret float [[C]]
;
  %A = fcmp oeq float %x, 0.0
  %B = fsub nsz float %z, %x
  %C = select i1 %A, float %B, float %y
  ret float %C
}

; This is logically equivalent to the previous test - fcmp ignores the sign of 0.0.

define float @select_fsub_fcmp_negzero(float %x, float %y, float %z) {
; CHECK-LABEL: @select_fsub_fcmp_negzero(
; CHECK-NEXT:    [[A:%.*]] = fcmp oeq float [[X:%.*]], 0.000000e+00
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[Z:%.*]], float [[Y:%.*]]
; CHECK-NEXT:    ret float [[C]]
;
  %A = fcmp oeq float %x, -0.0
  %B = fsub nsz float %z, %x
  %C = select i1 %A, float %B, float %y
  ret float %C
}

define float @select_fdiv_fcmp(float %x, float %y, float %z) {
; CHECK-LABEL: @select_fdiv_fcmp(
; CHECK-NEXT:    [[A:%.*]] = fcmp oeq float [[X:%.*]], 1.000000e+00
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[Z:%.*]], float [[Y:%.*]]
; CHECK-NEXT:    ret float [[C]]
;
  %A = fcmp oeq float %x, 1.0
  %B = fdiv nsz float %z, %x
  %C = select i1 %A, float %B, float %y
  ret float %C
}

define i32 @select_sub_icmp(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_sub_icmp(
; CHECK-NEXT:    [[A:%.*]] = icmp eq i32 [[X:%.*]], 0
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], i32 [[Z:%.*]], i32 [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp eq i32 %x, 0
  %B = sub i32 %z, %x
  %C = select i1 %A, i32 %B, i32 %y
  ret i32 %C
}

define i32 @select_sub_icmp_2(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_sub_icmp_2(
; CHECK-NEXT:    [[A:%.*]] = icmp eq i32 [[X:%.*]], 0
; CHECK-NEXT:    call void @use2(i1 [[A]])
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], i32 [[Z:%.*]], i32 [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp eq i32 %x, 0
  call void @use2(i1 %A)
  %B = sub i32 %z, %x
  %C = select i1 %A, i32 %B, i32 %y
  ret i32 %C
}

define i32 @select_sub_icmp_3(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_sub_icmp_3(
; CHECK-NEXT:    [[A:%.*]] = icmp ne i32 [[X:%.*]], 0
; CHECK-NEXT:    call void @use2(i1 [[A]])
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], i32 [[Y:%.*]], i32 [[Z:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp ne i32 %x, 0
  call void @use2(i1 %A)
  %B = sub i32 %z, %x
  %C = select i1 %A, i32 %y, i32 %B
  ret i32 %C
}

define <2 x i8> @select_sub_icmp_vec(<2 x i8> %x, <2 x i8> %y, <2 x i8> %z) {
; CHECK-LABEL: @select_sub_icmp_vec(
; CHECK-NEXT:    [[A:%.*]] = icmp eq <2 x i8> [[X:%.*]], zeroinitializer
; CHECK-NEXT:    [[C:%.*]] = select <2 x i1> [[A]], <2 x i8> [[Z:%.*]], <2 x i8> [[Y:%.*]]
; CHECK-NEXT:    ret <2 x i8> [[C]]
;
  %A = icmp eq <2 x i8>  %x, <i8 0, i8 0>
  %B = sub <2 x i8>  %z, %x
  %C = select <2 x i1>  %A, <2 x i8>  %B, <2 x i8>  %y
  ret <2 x i8>  %C
}

define i32 @select_shl_icmp(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_shl_icmp(
; CHECK-NEXT:    [[A:%.*]] = icmp ne i32 [[X:%.*]], 0
; CHECK-NEXT:    call void @use2(i1 [[A]])
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], i32 [[Y:%.*]], i32 [[Z:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp ne i32 %x, 0
  call void @use2(i1 %A) ; thwart predicate canonicalization
  %B = shl i32 %z, %x
  %C = select i1 %A, i32 %y, i32 %B
  ret i32 %C
}

define i32 @select_lshr_icmp(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_lshr_icmp(
; CHECK-NEXT:    [[A:%.*]] = icmp eq i32 [[X:%.*]], 0
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], i32 [[Z:%.*]], i32 [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp eq i32 %x, 0
  %B = lshr i32 %z, %x
  %C = select i1 %A, i32 %B, i32 %y
  ret i32 %C
}

define i32 @select_ashr_icmp(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_ashr_icmp(
; CHECK-NEXT:    [[A:%.*]] = icmp ne i32 [[X:%.*]], 0
; CHECK-NEXT:    call void @use2(i1 [[A]])
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], i32 [[Y:%.*]], i32 [[Z:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp ne i32 %x, 0
  call void @use2(i1 %A) ; thwart predicate canonicalization
  %B = ashr i32 %z, %x
  %C = select i1 %A, i32 %y, i32 %B
  ret i32 %C
}

define i32 @select_udiv_icmp(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_udiv_icmp(
; CHECK-NEXT:    [[A:%.*]] = icmp eq i32 [[X:%.*]], 1
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], i32 [[Z:%.*]], i32 [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp eq i32 %x, 1
  %B = udiv i32 %z, %x
  %C = select i1 %A, i32 %B, i32 %y
  ret i32 %C
}

define i32 @select_sdiv_icmp(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_sdiv_icmp(
; CHECK-NEXT:    [[A:%.*]] = icmp ne i32 [[X:%.*]], 1
; CHECK-NEXT:    call void @use2(i1 [[A]])
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], i32 [[Y:%.*]], i32 [[Z:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp ne i32 %x, 1
  call void @use2(i1 %A) ; thwart predicate canonicalization
  %B = sdiv i32 %z, %x
  %C = select i1 %A, i32 %y, i32 %B
  ret i32 %C
}

; Negative tests
define i32 @select_xor_icmp_bad_1(i32 %x, i32 %y, i32 %z, i32 %k) {
; CHECK-LABEL: @select_xor_icmp_bad_1(
; CHECK-NEXT:    [[A:%.*]] = icmp eq i32 [[X:%.*]], [[K:%.*]]
; CHECK-NEXT:    [[B:%.*]] = xor i32 [[X]], [[Z:%.*]]
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], i32 [[B]], i32 [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp eq i32 %x, %k
  %B = xor i32 %x, %z
  %C = select i1 %A, i32 %B, i32 %y
  ret i32 %C
}

define i32 @select_xor_icmp_bad_2(i32 %x, i32 %y, i32 %z, i32 %k) {
; CHECK-LABEL: @select_xor_icmp_bad_2(
; CHECK-NEXT:    [[A:%.*]] = icmp eq i32 [[X:%.*]], 0
; CHECK-NEXT:    [[B:%.*]] = xor i32 [[K:%.*]], [[Z:%.*]]
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], i32 [[B]], i32 [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp eq i32 %x, 0
  %B = xor i32 %k, %z
  %C = select i1 %A, i32 %B, i32 %y
  ret i32 %C
}

define i32 @select_xor_icmp_bad_3(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_xor_icmp_bad_3(
; CHECK-NEXT:    [[A:%.*]] = icmp eq i32 [[X:%.*]], 3
; CHECK-NEXT:    [[B:%.*]] = xor i32 [[Z:%.*]], 3
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], i32 [[B]], i32 [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp eq i32 %x, 3
  %B = xor i32 %x, %z
  %C = select i1 %A, i32 %B, i32 %y
  ret i32 %C
}

define i32 @select_xor_fcmp_bad_4(i32 %x, i32 %y, i32 %z, float %k) {
; CHECK-LABEL: @select_xor_fcmp_bad_4(
; CHECK-NEXT:    [[A:%.*]] = fcmp oeq float [[K:%.*]], 0.000000e+00
; CHECK-NEXT:    [[B:%.*]] = xor i32 [[X:%.*]], [[Z:%.*]]
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], i32 [[B]], i32 [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = fcmp oeq float %k, 0.0
  %B = xor i32 %x, %z
  %C = select i1 %A, i32 %B, i32 %y
  ret i32 %C
}

define i32 @select_xor_icmp_bad_5(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_xor_icmp_bad_5(
; CHECK-NEXT:    [[A_NOT:%.*]] = icmp eq i32 [[X:%.*]], 0
; CHECK-NEXT:    [[B:%.*]] = xor i32 [[X]], [[Z:%.*]]
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A_NOT]], i32 [[Y:%.*]], i32 [[B]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp ne i32 %x, 0
  %B = xor i32 %x, %z
  %C = select i1 %A, i32 %B, i32 %y
  ret i32 %C
}

define i32 @select_xor_icmp_bad_6(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_xor_icmp_bad_6(
; CHECK-NEXT:    [[A_NOT:%.*]] = icmp eq i32 [[X:%.*]], 1
; CHECK-NEXT:    [[B:%.*]] = xor i32 [[Z:%.*]], 1
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A_NOT]], i32 [[B]], i32 [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp ne i32 %x, 1
  %B = xor i32 %x, %z
  %C = select i1 %A, i32 %y, i32 %B
  ret i32 %C
}

; Value equivalence substitution is all-or-nothing, so needs a scalar compare.

define <2 x i8> @select_xor_icmp_vec_bad(<2 x i8> %x, <2 x i8> %y, <2 x i8> %z) {
; CHECK-LABEL: @select_xor_icmp_vec_bad(
; CHECK-NEXT:    [[A:%.*]] = icmp eq <2 x i8> [[X:%.*]], <i8 5, i8 3>
; CHECK-NEXT:    [[B:%.*]] = xor <2 x i8> [[X]], [[Z:%.*]]
; CHECK-NEXT:    [[C:%.*]] = select <2 x i1> [[A]], <2 x i8> [[B]], <2 x i8> [[Y:%.*]]
; CHECK-NEXT:    ret <2 x i8> [[C]]
;
  %A = icmp eq <2 x i8>  %x, <i8 5, i8 3>
  %B = xor <2 x i8>  %x, %z
  %C = select <2 x i1>  %A, <2 x i8>  %B, <2 x i8>  %y
  ret <2 x i8>  %C
}

; Value equivalence substitution is all-or-nothing, so needs a scalar compare.

define <2 x i32> @vec_select_no_equivalence(<2 x i32> %x) {
; CHECK-LABEL: @vec_select_no_equivalence(
; CHECK-NEXT:    [[X10:%.*]] = shufflevector <2 x i32> [[X:%.*]], <2 x i32> poison, <2 x i32> <i32 1, i32 0>
; CHECK-NEXT:    [[COND:%.*]] = icmp eq <2 x i32> [[X]], zeroinitializer
; CHECK-NEXT:    [[S:%.*]] = select <2 x i1> [[COND]], <2 x i32> [[X10]], <2 x i32> [[X]]
; CHECK-NEXT:    ret <2 x i32> [[S]]
;
  %x10 = shufflevector <2 x i32> %x, <2 x i32> undef, <2 x i32> <i32 1, i32 0>
  %cond = icmp eq <2 x i32> %x, zeroinitializer
  %s = select <2 x i1> %cond, <2 x i32> %x10, <2 x i32> %x
  ret <2 x i32> %s
}

; Folding this would only be legal if we sanitized undef to 0.
define <2 x i8> @select_xor_icmp_vec_undef(<2 x i8> %x, <2 x i8> %y, <2 x i8> %z) {
; CHECK-LABEL: @select_xor_icmp_vec_undef(
; CHECK-NEXT:    [[A:%.*]] = icmp eq <2 x i8> [[X:%.*]], <i8 0, i8 undef>
; CHECK-NEXT:    [[B:%.*]] = xor <2 x i8> [[X]], [[Z:%.*]]
; CHECK-NEXT:    [[C:%.*]] = select <2 x i1> [[A]], <2 x i8> [[B]], <2 x i8> [[Y:%.*]]
; CHECK-NEXT:    ret <2 x i8> [[C]]
;
  %A = icmp eq <2 x i8>  %x, <i8 0, i8 undef>
  %B = xor <2 x i8>  %x, %z
  %C = select <2 x i1>  %A, <2 x i8>  %B, <2 x i8>  %y
  ret <2 x i8>  %C
}

define i32 @select_mul_icmp_bad(i32 %x, i32 %y, i32 %z, i32 %k) {
; CHECK-LABEL: @select_mul_icmp_bad(
; CHECK-NEXT:    [[A:%.*]] = icmp eq i32 [[X:%.*]], 3
; CHECK-NEXT:    [[B:%.*]] = mul i32 [[Z:%.*]], 3
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], i32 [[B]], i32 [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp eq i32 %x, 3
  %B = mul i32 %x, %z
  %C = select i1 %A, i32 %B, i32 %y
  ret i32 %C
}

define i32 @select_add_icmp_bad(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_add_icmp_bad(
; CHECK-NEXT:    [[A:%.*]] = icmp eq i32 [[X:%.*]], 1
; CHECK-NEXT:    [[B:%.*]] = add i32 [[Z:%.*]], 1
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], i32 [[B]], i32 [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp eq i32 %x, 1
  %B = add i32 %x, %z
  %C = select i1 %A, i32 %B, i32 %y
  ret i32 %C
}

define i32 @select_and_icmp_zero(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_and_icmp_zero(
; CHECK-NEXT:    [[A:%.*]] = icmp eq i32 [[X:%.*]], 0
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], i32 0, i32 [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp eq i32 %x, 0
  %B = and i32 %x, %z
  %C = select i1 %A, i32 %B, i32 %y
  ret i32 %C
}

define i32 @select_or_icmp_bad(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_or_icmp_bad(
; CHECK-NEXT:    [[A:%.*]] = icmp eq i32 [[X:%.*]], 3
; CHECK-NEXT:    [[B:%.*]] = or i32 [[Z:%.*]], 3
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], i32 [[B]], i32 [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp eq i32 %x, 3
  %B = or i32 %x, %z
  %C = select i1 %A, i32 %B, i32 %y
  ret i32 %C
}

define i32 @select_lshr_icmp_const(i32 %x) {
; CHECK-LABEL: @select_lshr_icmp_const(
; CHECK-NEXT:    [[B:%.*]] = lshr i32 [[X:%.*]], 5
; CHECK-NEXT:    ret i32 [[B]]
;
  %A = icmp ugt i32 %x, 31
  %B = lshr i32 %x, 5
  %C = select i1 %A, i32 %B, i32 0
  ret i32 %C
}

define i32 @select_lshr_icmp_const_reordered(i32 %x) {
; CHECK-LABEL: @select_lshr_icmp_const_reordered(
; CHECK-NEXT:    [[B:%.*]] = lshr i32 [[X:%.*]], 5
; CHECK-NEXT:    ret i32 [[B]]
;
  %A = icmp ult i32 %x, 32
  %B = lshr i32 %x, 5
  %C = select i1 %A, i32 0, i32 %B
  ret i32 %C
}

define i32 @select_exact_lshr_icmp_const(i32 %x) {
; CHECK-LABEL: @select_exact_lshr_icmp_const(
; CHECK-NEXT:    [[B:%.*]] = lshr i32 [[X:%.*]], 5
; CHECK-NEXT:    ret i32 [[B]]
;
  %A = icmp ugt i32 %x, 31
  %B = lshr exact i32 %x, 5
  %C = select i1 %A, i32 %B, i32 0
  ret i32 %C
}

define i32 @select_lshr_icmp_const_large_exact_range(i32 %x) {
; CHECK-LABEL: @select_lshr_icmp_const_large_exact_range(
; CHECK-NEXT:    [[A:%.*]] = icmp ugt i32 [[X:%.*]], 63
; CHECK-NEXT:    [[B:%.*]] = lshr i32 [[X]], 5
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], i32 [[B]], i32 0
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp ugt i32 %x, 63
  %B = lshr i32 %x, 5
  %C = select i1 %A, i32 %B, i32 0
  ret i32 %C
}

define i32 @select_lshr_icmp_const_different_values(i32 %x, i32 %y) {
; CHECK-LABEL: @select_lshr_icmp_const_different_values(
; CHECK-NEXT:    [[A:%.*]] = icmp ugt i32 [[X:%.*]], 31
; CHECK-NEXT:    [[B:%.*]] = lshr i32 [[Y:%.*]], 5
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], i32 [[B]], i32 0
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp ugt i32 %x, 31
  %B = lshr i32 %y, 5
  %C = select i1 %A, i32 %B, i32 0
  ret i32 %C
}

; Invalid identity constant for FP op
define float @select_fadd_fcmp_bad(float %x, float %y, float %z) {
; CHECK-LABEL: @select_fadd_fcmp_bad(
; CHECK-NEXT:    [[A:%.*]] = fcmp oeq float [[X:%.*]], -1.000000e+00
; CHECK-NEXT:    [[B:%.*]] = fadd nsz float [[X]], [[Z:%.*]]
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[B]], float [[Y:%.*]]
; CHECK-NEXT:    ret float [[C]]
;
  %A = fcmp oeq float %x, -1.0
  %B = fadd nsz float %x, %z
  %C = select i1 %A, float %B, float %y
  ret float %C
}

; Invalid comparison type
define float @select_fadd_fcmp_bad_2(float %x, float %y, float %z) {
; CHECK-LABEL: @select_fadd_fcmp_bad_2(
; CHECK-NEXT:    [[A:%.*]] = fcmp ueq float [[X:%.*]], -1.000000e+00
; CHECK-NEXT:    [[B:%.*]] = fadd float [[X]], [[Z:%.*]]
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[B]], float [[Y:%.*]]
; CHECK-NEXT:    ret float [[C]]
;
  %A = fcmp ueq float %x, -1.0
  %B = fadd float %x, %z
  %C = select i1 %A, float %B, float %y
  ret float %C
}

; Invalid comparison type
define float @select_fadd_fcmp_bad_3(float %x, float %y, float %z, float %k) {
; CHECK-LABEL: @select_fadd_fcmp_bad_3(
; CHECK-NEXT:    [[A:%.*]] = fcmp one float [[X:%.*]], [[K:%.*]]
; CHECK-NEXT:    [[B:%.*]] = fadd float [[X]], [[Z:%.*]]
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[Y:%.*]], float [[B]]
; CHECK-NEXT:    ret float [[C]]
;
  %A = fcmp one float %x, %k
  %B = fadd float %x, %z
  %C = select i1 %A, float %y, float %B
  ret float %C
}

; Invalid order of operands of select
define float @select_fadd_fcmp_bad_4(float %x, float %y, float %z) {
; CHECK-LABEL: @select_fadd_fcmp_bad_4(
; CHECK-NEXT:    [[A:%.*]] = fcmp une float [[X:%.*]], 0.000000e+00
; CHECK-NEXT:    [[B:%.*]] = fadd float [[X]], [[Z:%.*]]
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[B]], float [[Y:%.*]]
; CHECK-NEXT:    ret float [[C]]
;
  %A = fcmp une float %x, -0.0
  %B = fadd float %x, %z
  %C = select i1 %A, float %B, float %y
  ret float %C
}

; Invalid comparison type
define float @select_fadd_fcmp_bad_5(float %x, float %y, float %z) {
; CHECK-LABEL: @select_fadd_fcmp_bad_5(
; CHECK-NEXT:    [[A:%.*]] = fcmp one float [[X:%.*]], 0.000000e+00
; CHECK-NEXT:    [[B:%.*]] = fadd nsz float [[Z:%.*]], [[X]]
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[Y:%.*]], float [[B]]
; CHECK-NEXT:    ret float [[C]]
;
  %A = fcmp one float %x, -0.0
  %B = fadd nsz float %z, %x
  %C = select i1 %A, float %y, float %B
  ret float %C
}

; Invalid order of operands of select
define float @select_fadd_fcmp_bad_6(float %x, float %y, float %z) {
; CHECK-LABEL: @select_fadd_fcmp_bad_6(
; CHECK-NEXT:    [[A:%.*]] = fcmp oeq float [[X:%.*]], 0.000000e+00
; CHECK-NEXT:    [[B:%.*]] = fadd nsz float [[Z:%.*]], [[X]]
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[Y:%.*]], float [[B]]
; CHECK-NEXT:    ret float [[C]]
;
  %A = fcmp oeq float %x, -0.0
  %B = fadd nsz float %z, %x
  %C = select i1 %A, float %y, float %B
  ret float %C
}

; Do not transform if we have signed zeros and if Z is possibly negative zero
define float @select_fadd_fcmp_bad_7(float %x, float %y, float %z) {
; CHECK-LABEL: @select_fadd_fcmp_bad_7(
; CHECK-NEXT:    [[A:%.*]] = fcmp oeq float [[X:%.*]], 0.000000e+00
; CHECK-NEXT:    [[B:%.*]] = fadd float [[X]], [[Z:%.*]]
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[B]], float [[Y:%.*]]
; CHECK-NEXT:    ret float [[C]]
;
  %A = fcmp oeq float %x, -0.0
  %B = fadd float %x, %z
  %C = select i1 %A, float %B, float %y
  ret float %C
}

; Invalid comparison type
define float @select_fadd_fcmp_bad_8(float %x, float %y, float %v) {
; CHECK-LABEL: @select_fadd_fcmp_bad_8(
; CHECK-NEXT:    [[A:%.*]] = fcmp one float [[X:%.*]], 0.000000e+00
; CHECK-NEXT:    [[Z:%.*]] = fadd float [[V:%.*]], -1.000000e+00
; CHECK-NEXT:    [[B:%.*]] = fadd float [[Z]], [[X]]
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[Y:%.*]], float [[B]]
; CHECK-NEXT:    ret float [[C]]
;
  %A = fcmp one float %x, -0.0
  %z = fadd float %v, -1.0
  %B = fadd float %z, %x
  %C = select i1 %A, float %y, float %B
  ret float %C
}

; Invalid comparison type
define float @select_fadd_fcmp_bad_9(float %x, float %y, float %z) {
; CHECK-LABEL: @select_fadd_fcmp_bad_9(
; CHECK-NEXT:    [[A:%.*]] = fcmp one float [[X:%.*]], 0.000000e+00
; CHECK-NEXT:    [[B:%.*]] = fadd nsz float [[Z:%.*]], [[X]]
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[Y:%.*]], float [[B]]
; CHECK-NEXT:    ret float [[C]]
;
  %A = fcmp one float %x, -0.0
  %B = fadd nsz float %z, %x
  %C = select i1 %A, float %y, float %B
  ret float %C
}

; Invalid comparison type
define float @select_fadd_fcmp_bad_10(float %x, float %y, float %v) {
; CHECK-LABEL: @select_fadd_fcmp_bad_10(
; CHECK-NEXT:    [[A:%.*]] = fcmp one float [[X:%.*]], 0.000000e+00
; CHECK-NEXT:    [[Z:%.*]] = fadd float [[V:%.*]], 0.000000e+00
; CHECK-NEXT:    [[B:%.*]] = fadd float [[Z]], [[X]]
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[Y:%.*]], float [[B]]
; CHECK-NEXT:    ret float [[C]]
;
  %A = fcmp one float %x, -0.0
  %z = fadd float %v, 0.0 ; cannot produce -0.0
  %B = fadd float %z, %x
  %C = select i1 %A, float %y, float %B
  ret float %C
}

; Do not transform if Z is possibly negative zero
define float @select_fadd_fcmp_bad_11(float %x, float %y, float %v) {
; CHECK-LABEL: @select_fadd_fcmp_bad_11(
; CHECK-NEXT:    [[A:%.*]] = fcmp une float [[X:%.*]], 0.000000e+00
; CHECK-NEXT:    [[Z:%.*]] = fadd float [[V:%.*]], -1.000000e+00
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[Y:%.*]], float [[Z]]
; CHECK-NEXT:    ret float [[C]]
;
  %A = fcmp une float %x, -0.0
  %z = fadd float %v, -1.0
  %B = fadd nsz float %z, %x
  %C = select i1 %A, float %y, float %B
  ret float %C
}

; Do not transform if we have signed zeros and if Z is possibly negative zero
define float @select_fadd_fcmp_bad_12(float %x, float %y, float %z) {
; CHECK-LABEL: @select_fadd_fcmp_bad_12(
; CHECK-NEXT:    [[A:%.*]] = fcmp une float [[X:%.*]], 0.000000e+00
; CHECK-NEXT:    [[B:%.*]] = fadd float [[Z:%.*]], [[X]]
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[Y:%.*]], float [[B]]
; CHECK-NEXT:    ret float [[C]]
;
  %A = fcmp une float %x, -0.0
  %B = fadd float %z, %x
  %C = select i1 %A, float %y, float %B
  ret float %C
}

; Invalid order of operands of select
define float @select_fadd_fcmp_bad_13(float %x, float %y, float %z) {
; CHECK-LABEL: @select_fadd_fcmp_bad_13(
; CHECK-NEXT:    [[A:%.*]] = fcmp oeq float [[X:%.*]], 0.000000e+00
; CHECK-NEXT:    [[B:%.*]] = fadd nsz float [[X]], [[Z:%.*]]
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[Y:%.*]], float [[B]]
; CHECK-NEXT:    ret float [[C]]
;
  %A = fcmp oeq float %x, -0.0
  %B = fadd nsz float %x, %z
  %C = select i1 %A, float %y, float %B
  ret float %C
}

; Invalid identity constant for FP op
define float @select_fadd_fcmp_bad_14(float %x, float %y, float %z) {
; CHECK-LABEL: @select_fadd_fcmp_bad_14(
; CHECK-NEXT:    [[A:%.*]] = fcmp une float [[X:%.*]], -1.000000e+00
; CHECK-NEXT:    [[B:%.*]] = fadd nsz float [[X]], [[Z:%.*]]
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[Y:%.*]], float [[B]]
; CHECK-NEXT:    ret float [[C]]
;
  %A = fcmp une float %x, -1.0
  %B = fadd nsz float %x, %z
  %C = select i1 %A, float %y, float %B
  ret float %C
}

define float @select_fmul_fcmp_bad(float %x, float %y, float %z) {
; CHECK-LABEL: @select_fmul_fcmp_bad(
; CHECK-NEXT:    [[A:%.*]] = fcmp oeq float [[X:%.*]], 3.000000e+00
; CHECK-NEXT:    [[B:%.*]] = fmul nsz float [[X]], [[Z:%.*]]
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[B]], float [[Y:%.*]]
; CHECK-NEXT:    ret float [[C]]
;
  %A = fcmp oeq float %x, 3.0
  %B = fmul nsz float %x, %z
  %C = select i1 %A, float %B, float %y
  ret float %C
}

define float @select_fmul_fcmp_bad_2(float %x, float %y, float %z) {
; CHECK-LABEL: @select_fmul_fcmp_bad_2(
; CHECK-NEXT:    [[A:%.*]] = fcmp oeq float [[X:%.*]], 1.000000e+00
; CHECK-NEXT:    [[B:%.*]] = fmul float [[X]], [[Z:%.*]]
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[B]], float [[Y:%.*]]
; CHECK-NEXT:    ret float [[C]]
;
  %A = fcmp oeq float %x, 1.0
  %B = fmul float %x, %z
  %C = select i1 %A, float %B, float %y
  ret float %C
}

define float @select_fmul_icmp_bad(float %x, float %y, float %z, i32 %k) {
; CHECK-LABEL: @select_fmul_icmp_bad(
; CHECK-NEXT:    [[A:%.*]] = icmp eq i32 [[K:%.*]], 0
; CHECK-NEXT:    [[B:%.*]] = fmul float [[X:%.*]], [[Z:%.*]]
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[B]], float [[Y:%.*]]
; CHECK-NEXT:    ret float [[C]]
;
  %A = icmp eq i32 %k, 0
  %B = fmul float %x, %z
  %C = select i1 %A, float %B, float %y
  ret float %C
}

define float @select_fmul_icmp_bad_2(float %x, float %y, float %z, i32 %k) {
; CHECK-LABEL: @select_fmul_icmp_bad_2(
; CHECK-NEXT:    [[A:%.*]] = icmp eq i32 [[K:%.*]], 0
; CHECK-NEXT:    [[B:%.*]] = fmul nsz float [[X:%.*]], [[Z:%.*]]
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[B]], float [[Y:%.*]]
; CHECK-NEXT:    ret float [[C]]
;
  %A = icmp eq i32 %k, 0
  %B = fmul nsz float %x, %z
  %C = select i1 %A, float %B, float %y
  ret float %C
}

define float @select_fdiv_fcmp_bad(float %x, float %y, float %z) {
; CHECK-LABEL: @select_fdiv_fcmp_bad(
; CHECK-NEXT:    [[A:%.*]] = fcmp oeq float [[X:%.*]], 1.000000e+00
; CHECK-NEXT:    [[B:%.*]] = fdiv float [[X]], [[Z:%.*]]
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[B]], float [[Y:%.*]]
; CHECK-NEXT:    ret float [[C]]
;
  %A = fcmp oeq float %x, 1.0
  %B = fdiv float %x, %z
  %C = select i1 %A, float %B, float %y
  ret float %C
}

define float @select_fdiv_fcmp_bad_2(float %x, float %y, float %z) {
; CHECK-LABEL: @select_fdiv_fcmp_bad_2(
; CHECK-NEXT:    [[A:%.*]] = fcmp oeq float [[X:%.*]], 3.000000e+00
; CHECK-NEXT:    [[B:%.*]] = fdiv nsz float [[X]], [[Z:%.*]]
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[B]], float [[Y:%.*]]
; CHECK-NEXT:    ret float [[C]]
;
  %A = fcmp oeq float %x, 3.0
  %B = fdiv nsz float %x, %z
  %C = select i1 %A, float %B, float %y
  ret float %C
}

; The transform is not valid when x = -0.0 and z = -0.0
; (optimized code would return -0.0, but this returns +0.0).

define float @select_fsub_fcmp_bad(float %x, float %y, float %z) {
; CHECK-LABEL: @select_fsub_fcmp_bad(
; CHECK-NEXT:    [[A:%.*]] = fcmp oeq float [[X:%.*]], 0.000000e+00
; CHECK-NEXT:    [[B:%.*]] = fsub float [[Z:%.*]], [[X]]
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[B]], float [[Y:%.*]]
; CHECK-NEXT:    ret float [[C]]
;
  %A = fcmp oeq float %x, 0.0
  %B = fsub float %z, %x
  %C = select i1 %A, float %B, float %y
  ret float %C
}

define float @select_fsub_fcmp_bad_2(float %x, float %y, float %z) {
; CHECK-LABEL: @select_fsub_fcmp_bad_2(
; CHECK-NEXT:    [[A:%.*]] = fcmp oeq float [[X:%.*]], 1.000000e+00
; CHECK-NEXT:    [[B:%.*]] = fsub nsz float [[Z:%.*]], [[X]]
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], float [[B]], float [[Y:%.*]]
; CHECK-NEXT:    ret float [[C]]
;
  %A = fcmp oeq float %x, 1.0
  %B = fsub nsz float %z, %x
  %C = select i1 %A, float %B, float %y
  ret float %C
}

define i32 @select_sub_icmp_bad(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_sub_icmp_bad(
; CHECK-NEXT:    [[A:%.*]] = icmp eq i32 [[X:%.*]], 0
; CHECK-NEXT:    [[B:%.*]] = sub i32 0, [[Z:%.*]]
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], i32 [[B]], i32 [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp eq i32 %x, 0
  %B = sub i32 %x, %z
  %C = select i1 %A, i32 %B, i32 %y
  ret i32 %C
}

define i32 @select_sub_icmp_bad_2(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_sub_icmp_bad_2(
; CHECK-NEXT:    [[A:%.*]] = icmp eq i32 [[X:%.*]], 1
; CHECK-NEXT:    [[B:%.*]] = add i32 [[Z:%.*]], -1
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], i32 [[B]], i32 [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp eq i32 %x, 1
  %B = sub i32 %z, %x
  %C = select i1 %A, i32 %B, i32 %y
  ret i32 %C
}

define i32 @select_sub_icmp_bad_3(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_sub_icmp_bad_3(
; CHECK-NEXT:    [[A:%.*]] = icmp ne i32 [[X:%.*]], 0
; CHECK-NEXT:    call void @use2(i1 [[A]])
; CHECK-NEXT:    [[B:%.*]] = sub i32 [[Z:%.*]], [[X]]
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], i32 [[B]], i32 [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp ne i32 %x, 0
  call void @use2(i1 %A)
  %B = sub i32 %z, %x
  %C = select i1 %A, i32 %B, i32 %y
  ret i32 %C
}

define i32 @select_sub_icmp_4(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_sub_icmp_4(
; CHECK-NEXT:    [[A:%.*]] = icmp ne i32 [[X:%.*]], 0
; CHECK-NEXT:    call void @use2(i1 [[A]])
; CHECK-NEXT:    [[B:%.*]] = sub i32 [[Z:%.*]], [[X]]
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], i32 [[B]], i32 [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp ne i32 %x, 0
  call void @use2(i1 %A)
  %B = sub i32 %z, %x
  %C = select i1 %A, i32 %B, i32 %y
  ret i32 %C
}

define i32 @select_sub_icmp_bad_4(i32 %x, i32 %y, i32 %z, i32 %k) {
; CHECK-LABEL: @select_sub_icmp_bad_4(
; CHECK-NEXT:    [[A:%.*]] = icmp eq i32 [[X:%.*]], 0
; CHECK-NEXT:    [[B:%.*]] = sub i32 [[Z:%.*]], [[K:%.*]]
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], i32 [[B]], i32 [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp eq i32 %x, 0
  %B = sub i32 %z, %k
  %C = select i1 %A, i32 %B, i32 %y
  ret i32 %C
}

define i32 @select_sub_icmp_bad_5(i32 %x, i32 %y, i32 %z, i32 %k) {
; CHECK-LABEL: @select_sub_icmp_bad_5(
; CHECK-NEXT:    [[A:%.*]] = icmp eq i32 [[X:%.*]], [[K:%.*]]
; CHECK-NEXT:    [[B:%.*]] = sub i32 [[Z:%.*]], [[X]]
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], i32 [[B]], i32 [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp eq i32 %x, %k
  %B = sub i32 %z, %x
  %C = select i1 %A, i32 %B, i32 %y
  ret i32 %C
}

define i32 @select_shl_icmp_bad(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_shl_icmp_bad(
; CHECK-NEXT:    [[A:%.*]] = icmp eq i32 [[X:%.*]], 1
; CHECK-NEXT:    [[B:%.*]] = shl i32 [[Z:%.*]], 1
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], i32 [[B]], i32 [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp eq i32 %x, 1
  %B = shl i32 %z, %x
  %C = select i1 %A, i32 %B, i32 %y
  ret i32 %C
}

define i32 @select_lshr_icmp_bad(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_lshr_icmp_bad(
; CHECK-NEXT:    [[A:%.*]] = icmp eq i32 [[X:%.*]], 1
; CHECK-NEXT:    [[B:%.*]] = lshr i32 [[Z:%.*]], 1
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], i32 [[B]], i32 [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp eq i32 %x, 1
  %B = lshr i32 %z, %x
  %C = select i1 %A, i32 %B, i32 %y
  ret i32 %C
}

define i32 @select_ashr_icmp_bad(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_ashr_icmp_bad(
; CHECK-NEXT:    [[A:%.*]] = icmp eq i32 [[X:%.*]], 1
; CHECK-NEXT:    [[B:%.*]] = ashr i32 [[Z:%.*]], 1
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], i32 [[B]], i32 [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp eq i32 %x, 1
  %B = ashr i32 %z, %x
  %C = select i1 %A, i32 %B, i32 %y
  ret i32 %C
}

define i32 @select_udiv_icmp_bad(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_udiv_icmp_bad(
; CHECK-NEXT:    [[A:%.*]] = icmp eq i32 [[X:%.*]], 3
; CHECK-NEXT:    [[B:%.*]] = udiv i32 [[Z:%.*]], [[X]]
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], i32 [[B]], i32 [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp eq i32 %x, 3
  %B = udiv i32 %z, %x
  %C = select i1 %A, i32 %B, i32 %y
  ret i32 %C
}

define i32 @select_sdiv_icmp_bad(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_sdiv_icmp_bad(
; CHECK-NEXT:    [[A:%.*]] = icmp eq i32 [[X:%.*]], 3
; CHECK-NEXT:    [[B:%.*]] = sdiv i32 [[Z:%.*]], [[X]]
; CHECK-NEXT:    [[C:%.*]] = select i1 [[A]], i32 [[B]], i32 [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[C]]
;
  %A = icmp eq i32 %x, 3
  %B = sdiv i32 %z, %x
  %C = select i1 %A, i32 %B, i32 %y
  ret i32 %C
}

; Can replace %x with 0, because sub is only used in the select.
define i32 @select_replace_one_use(i32 %x, i32 %y) {
; CHECK-LABEL: @select_replace_one_use(
; CHECK-NEXT:    [[C:%.*]] = icmp eq i32 [[X:%.*]], 0
; CHECK-NEXT:    [[SUB:%.*]] = sub i32 0, [[Y:%.*]]
; CHECK-NEXT:    [[S:%.*]] = select i1 [[C]], i32 [[SUB]], i32 [[Y]]
; CHECK-NEXT:    ret i32 [[S]]
;
  %c = icmp eq i32 %x, 0
  %sub = sub i32 %x, %y
  %s = select i1 %c, i32 %sub, i32 %y
  ret i32 %s
}

; Can not replace %x with 0, because %sub has other uses as well.
define i32 @select_replace_multi_use(i32 %x, i32 %y) {
; CHECK-LABEL: @select_replace_multi_use(
; CHECK-NEXT:    [[C:%.*]] = icmp eq i32 [[X:%.*]], 0
; CHECK-NEXT:    [[SUB:%.*]] = sub i32 [[X]], [[Y:%.*]]
; CHECK-NEXT:    call void @use_i32(i32 [[SUB]])
; CHECK-NEXT:    [[S:%.*]] = select i1 [[C]], i32 [[SUB]], i32 [[Y]]
; CHECK-NEXT:    ret i32 [[S]]
;
  %c = icmp eq i32 %x, 0
  %sub = sub i32 %x, %y
  call void @use_i32(i32 %sub)
  %s = select i1 %c, i32 %sub, i32 %y
  ret i32 %s
}

; Case where the replacement allows the instruction to fold away.
define i32 @select_replace_fold(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_replace_fold(
; CHECK-NEXT:    [[C:%.*]] = icmp eq i32 [[X:%.*]], 0
; CHECK-NEXT:    [[S:%.*]] = select i1 [[C]], i32 [[Z:%.*]], i32 [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[S]]
;
  %c = icmp eq i32 %x, 0
  %fshr = call i32 @llvm.fshr.i32(i32 %y, i32 %z, i32 %x)
  %s = select i1 %c, i32 %fshr, i32 %y
  ret i32 %s
}


; Case where the use of %x is in a nested instruction.
define i32 @select_replace_nested(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_replace_nested(
; CHECK-NEXT:    [[C:%.*]] = icmp eq i32 [[X:%.*]], 0
; CHECK-NEXT:    [[ADD:%.*]] = select i1 [[C]], i32 [[Z:%.*]], i32 0
; CHECK-NEXT:    [[S:%.*]] = add i32 [[Y:%.*]], [[ADD]]
; CHECK-NEXT:    ret i32 [[S]]
;
  %c = icmp eq i32 %x, 0
  %sub = sub i32 %y, %x
  %add = add i32 %sub, %z
  %s = select i1 %c, i32 %add, i32 %y
  ret i32 %s
}

define i32 @select_replace_nested_extra_use(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_replace_nested_extra_use(
; CHECK-NEXT:    [[C:%.*]] = icmp eq i32 [[X:%.*]], 0
; CHECK-NEXT:    [[SUB:%.*]] = sub i32 [[Y:%.*]], [[X]]
; CHECK-NEXT:    call void @use.i32(i32 [[SUB]])
; CHECK-NEXT:    [[ADD:%.*]] = add i32 [[SUB]], [[Z:%.*]]
; CHECK-NEXT:    [[S:%.*]] = select i1 [[C]], i32 [[ADD]], i32 [[Y]]
; CHECK-NEXT:    ret i32 [[S]]
;
  %c = icmp eq i32 %x, 0
  %sub = sub i32 %y, %x
  call void @use.i32(i32 %sub)
  %add = add i32 %sub, %z
  %s = select i1 %c, i32 %add, i32 %y
  ret i32 %s
}

define i32 @select_replace_nested_no_simplify(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_replace_nested_no_simplify(
; CHECK-NEXT:    [[C:%.*]] = icmp eq i32 [[X:%.*]], 1
; CHECK-NEXT:    [[SUB:%.*]] = add i32 [[Y:%.*]], -1
; CHECK-NEXT:    [[ADD:%.*]] = add i32 [[SUB]], [[Z:%.*]]
; CHECK-NEXT:    [[S:%.*]] = select i1 [[C]], i32 [[ADD]], i32 [[Y]]
; CHECK-NEXT:    ret i32 [[S]]
;
  %c = icmp eq i32 %x, 1
  %sub = sub i32 %y, %x
  %add = add i32 %sub, %z
  %s = select i1 %c, i32 %add, i32 %y
  ret i32 %s
}

; FIXME: We only perform replacements two levels up right now.
define i32 @select_replace_deeply_nested(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_replace_deeply_nested(
; CHECK-NEXT:    [[C:%.*]] = icmp eq i32 [[X:%.*]], 0
; CHECK-NEXT:    [[SUB:%.*]] = sub i32 [[Y:%.*]], [[X]]
; CHECK-NEXT:    [[ADD:%.*]] = add i32 [[SUB]], [[Z:%.*]]
; CHECK-NEXT:    [[SHL:%.*]] = shl i32 [[ADD]], 1
; CHECK-NEXT:    [[S:%.*]] = select i1 [[C]], i32 [[SHL]], i32 [[Y]]
; CHECK-NEXT:    ret i32 [[S]]
;
  %c = icmp eq i32 %x, 0
  %sub = sub i32 %y, %x
  %add = add i32 %sub, %z
  %shl = shl i32 %add, 1
  %s = select i1 %c, i32 %shl, i32 %y
  ret i32 %s
}

; Do not replace with constant expressions. The profitability in this case is
; unclear, and such replacements have historically lead to infinite combine
; loops.
define i32 @select_replace_constexpr(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_replace_constexpr(
; CHECK-NEXT:    [[C:%.*]] = icmp eq i32 [[X:%.*]], ptrtoint (ptr @g to i32)
; CHECK-NEXT:    [[ADD:%.*]] = add i32 [[X]], [[Y:%.*]]
; CHECK-NEXT:    [[S:%.*]] = select i1 [[C]], i32 [[ADD]], i32 [[Z:%.*]]
; CHECK-NEXT:    ret i32 [[S]]
;
  %c = icmp eq i32 %x, ptrtoint (ptr @g to i32)
  %add = add i32 %x, %y
  %s = select i1 %c, i32 %add, i32 %z
  ret i32 %s
}

; Don't replace with a potentially undef constant, as undef could evaluate
; to different values for both uses.
define <2 x i32> @select_replace_undef(<2 x i32> %x, <2 x i32> %y) {
; CHECK-LABEL: @select_replace_undef(
; CHECK-NEXT:    [[C:%.*]] = icmp eq <2 x i32> [[X:%.*]], <i32 0, i32 undef>
; CHECK-NEXT:    [[SUB:%.*]] = sub <2 x i32> [[X]], [[Y:%.*]]
; CHECK-NEXT:    [[S:%.*]] = select <2 x i1> [[C]], <2 x i32> [[SUB]], <2 x i32> [[Y]]
; CHECK-NEXT:    ret <2 x i32> [[S]]
;
  %c = icmp eq <2 x i32> %x, <i32 0, i32 undef>
  %sub = sub <2 x i32> %x, %y
  %s = select <2 x i1> %c, <2 x i32> %sub, <2 x i32> %y
  ret <2 x i32> %s
}

; We can replace the call arguments, as the call is speculatable.
define i32 @select_replace_call_speculatable(i32 %x, i32 %y) {
; CHECK-LABEL: @select_replace_call_speculatable(
; CHECK-NEXT:    [[C:%.*]] = icmp eq i32 [[X:%.*]], 0
; CHECK-NEXT:    [[CALL:%.*]] = call i32 @call_speculatable(i32 0, i32 0)
; CHECK-NEXT:    [[S:%.*]] = select i1 [[C]], i32 [[CALL]], i32 [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[S]]
;
  %c = icmp eq i32 %x, 0
  %call = call i32 @call_speculatable(i32 %x, i32 %x)
  %s = select i1 %c, i32 %call, i32 %y
  ret i32 %s
}

define i32 @select_replace_call_speculatable_intrinsic(i32 %x, i32 %y) {
; CHECK-LABEL: @select_replace_call_speculatable_intrinsic(
; CHECK-NEXT:    [[C:%.*]] = icmp eq i32 [[X:%.*]], 0
; CHECK-NEXT:    [[CALL:%.*]] = call i32 @llvm.smax.i32(i32 [[Y:%.*]], i32 0)
; CHECK-NEXT:    [[S:%.*]] = select i1 [[C]], i32 [[CALL]], i32 [[Y]]
; CHECK-NEXT:    ret i32 [[S]]
;
  %c = icmp eq i32 %x, 0
  %call = call i32 @llvm.smax.i32(i32 %x, i32 %y)
  %s = select i1 %c, i32 %call, i32 %y
  ret i32 %s
}

; We can't replace the call arguments, as the call is not speculatable. We
; may end up changing side-effects or causing undefined behavior.
define i32 @select_replace_call_non_speculatable(i32 %x, i32 %y) {
; CHECK-LABEL: @select_replace_call_non_speculatable(
; CHECK-NEXT:    [[C:%.*]] = icmp eq i32 [[X:%.*]], 0
; CHECK-NEXT:    [[CALL:%.*]] = call i32 @call_non_speculatable(i32 [[X]], i32 [[X]])
; CHECK-NEXT:    [[S:%.*]] = select i1 [[C]], i32 [[CALL]], i32 [[Y:%.*]]
; CHECK-NEXT:    ret i32 [[S]]
;
  %c = icmp eq i32 %x, 0
  %call = call i32 @call_non_speculatable(i32 %x, i32 %x)
  %s = select i1 %c, i32 %call, i32 %y
  ret i32 %s
}

; We can replace %x by 2 here, because division by two cannot cause UB.
; FIXME: As we check speculation prior to replacement, we don't catch this.
define i32 @select_replace_sdiv_speculatable(i32 %x, i32 %y) {
; CHECK-LABEL: @select_replace_sdiv_speculatable(
; CHECK-NEXT:    [[C:%.*]] = icmp eq i32 [[X:%.*]], 2
; CHECK-NEXT:    [[DIV:%.*]] = sdiv i32 [[Y:%.*]], [[X]]
; CHECK-NEXT:    [[S:%.*]] = select i1 [[C]], i32 [[DIV]], i32 [[Y]]
; CHECK-NEXT:    ret i32 [[S]]
;
  %c = icmp eq i32 %x, 2
  %div = sdiv i32 %y, %x
  %s = select i1 %c, i32 %div, i32 %y
  ret i32 %s
}

; We cannot replace %x by -1, because division by -1 can cause UB.
define i32 @select_replace_sdiv_non_speculatable(i32 %x, i32 %y) {
; CHECK-LABEL: @select_replace_sdiv_non_speculatable(
; CHECK-NEXT:    [[C:%.*]] = icmp eq i32 [[X:%.*]], -1
; CHECK-NEXT:    [[DIV:%.*]] = sdiv i32 [[Y:%.*]], [[X]]
; CHECK-NEXT:    [[S:%.*]] = select i1 [[C]], i32 [[DIV]], i32 [[Y]]
; CHECK-NEXT:    ret i32 [[S]]
;
  %c = icmp eq i32 %x, -1
  %div = sdiv i32 %y, %x
  %s = select i1 %c, i32 %div, i32 %y
  ret i32 %s
}

; We can replace %x by 2 here, because division by two cannot cause UB.
; FIXME: As we check speculation prior to replacement, we don't catch this.
define i32 @select_replace_udiv_speculatable(i32 %x, i32 %y) {
; CHECK-LABEL: @select_replace_udiv_speculatable(
; CHECK-NEXT:    [[C:%.*]] = icmp eq i32 [[X:%.*]], 2
; CHECK-NEXT:    [[DIV:%.*]] = udiv i32 [[Y:%.*]], [[X]]
; CHECK-NEXT:    [[S:%.*]] = select i1 [[C]], i32 [[DIV]], i32 [[Y]]
; CHECK-NEXT:    ret i32 [[S]]
;
  %c = icmp eq i32 %x, 2
  %div = udiv i32 %y, %x
  %s = select i1 %c, i32 %div, i32 %y
  ret i32 %s
}

; We can't replace %x by 0 here, because that would cause UB. However,
; replacing the udiv result by poison is fine.
define i32 @select_replace_udiv_non_speculatable(i32 %x, i32 %y) {
; CHECK-LABEL: @select_replace_udiv_non_speculatable(
; CHECK-NEXT:    ret i32 [[Y:%.*]]
;
  %c = icmp eq i32 %x, 0
  %div = udiv i32 %y, %x
  %s = select i1 %c, i32 %div, i32 %y
  ret i32 %s
}

; We can't replace %i in the phi node here, because it refers to %i from
; the previous loop iteration, not the current one.
define void @select_replace_phi(i32 %x) {
; CHECK-LABEL: @select_replace_phi(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[I:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[I_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[I_PREV:%.*]] = phi i32 [ -1, [[ENTRY]] ], [ [[I]], [[LOOP]] ]
; CHECK-NEXT:    [[I_NEXT]] = add i32 [[I]], 1
; CHECK-NEXT:    [[C:%.*]] = icmp eq i32 [[I]], 0
; CHECK-NEXT:    [[S:%.*]] = select i1 [[C]], i32 [[I_PREV]], i32 2
; CHECK-NEXT:    call void @use_i32(i32 [[S]])
; CHECK-NEXT:    br label [[LOOP]]
;
entry:
  br label %loop

loop:
  %i = phi i32 [ 0, %entry ], [ %i.next, %loop ]
  %i.prev = phi i32 [ -1, %entry], [ %i, %loop ]
  %i.next = add i32 %i, 1
  %c = icmp eq i32 %i, 0
  %s = select i1 %c, i32 %i.prev, i32 2
  call void @use_i32(i32 %s)
  br label %loop
}

@g = global i32 0
declare i32 @llvm.fshr.i32(i32, i32, i32)
declare i32 @call_speculatable(i32, i32) speculatable
declare i32 @call_non_speculatable(i32, i32)
declare void @use_i32(i32)

!0 = !{!"branch_weights", i32 2, i32 10}