test/Transforms/InstCombine/sub-gep.ll

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

target datalayout = "e-p:64:64:64-p1:16:16:16-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128"

define i64 @test_inbounds(ptr %base, i64 %idx) {
; CHECK-LABEL: @test_inbounds(
; CHECK-NEXT:    [[P2_IDX:%.*]] = shl nsw i64 [[IDX:%.*]], 2
; CHECK-NEXT:    ret i64 [[P2_IDX]]
;
  %p2 = getelementptr inbounds [0 x i32], ptr %base, i64 0, i64 %idx
  %i1 = ptrtoint ptr %base to i64
  %i2 = ptrtoint ptr %p2 to i64
  %d = sub i64 %i2, %i1
  ret i64 %d
}

define i64 @test_partial_inbounds1(ptr %base, i64 %idx) {
; CHECK-LABEL: @test_partial_inbounds1(
; CHECK-NEXT:    [[P2_IDX:%.*]] = shl i64 [[IDX:%.*]], 2
; CHECK-NEXT:    ret i64 [[P2_IDX]]
;
  %p2 = getelementptr [0 x i32], ptr %base, i64 0, i64 %idx
  %i1 = ptrtoint ptr %base to i64
  %i2 = ptrtoint ptr %p2 to i64
  %d = sub i64 %i2, %i1
  ret i64 %d
}

define i64 @test_partial_inbounds2(ptr %base, i64 %idx) {
; CHECK-LABEL: @test_partial_inbounds2(
; CHECK-NEXT:    [[P2_IDX:%.*]] = shl nsw i64 [[IDX:%.*]], 2
; CHECK-NEXT:    ret i64 [[P2_IDX]]
;
  %p2 = getelementptr inbounds [0 x i32], ptr %base, i64 0, i64 %idx
  %i1 = ptrtoint ptr %base to i64
  %i2 = ptrtoint ptr %p2 to i64
  %d = sub i64 %i2, %i1
  ret i64 %d
}

define i64 @test_inbounds_nuw(ptr %base, i64 %idx) {
; CHECK-LABEL: @test_inbounds_nuw(
; CHECK-NEXT:    [[P2_IDX:%.*]] = shl nuw nsw i64 [[IDX:%.*]], 2
; CHECK-NEXT:    ret i64 [[P2_IDX]]
;
  %p2 = getelementptr inbounds [0 x i32], ptr %base, i64 0, i64 %idx
  %i1 = ptrtoint ptr %base to i64
  %i2 = ptrtoint ptr %p2 to i64
  %d = sub nuw i64 %i2, %i1
  ret i64 %d
}

define i64 @test_nuw(ptr %base, i64 %idx) {
; CHECK-LABEL: @test_nuw(
; CHECK-NEXT:    [[P2_IDX:%.*]] = shl i64 [[IDX:%.*]], 2
; CHECK-NEXT:    ret i64 [[P2_IDX]]
;
  %p2 = getelementptr [0 x i32], ptr %base, i64 0, i64 %idx
  %i1 = ptrtoint ptr %base to i64
  %i2 = ptrtoint ptr %p2 to i64
  %d = sub nuw i64 %i2, %i1
  ret i64 %d
}

define i32 @test_inbounds_nuw_trunc(ptr %base, i64 %idx) {
; CHECK-LABEL: @test_inbounds_nuw_trunc(
; CHECK-NEXT:    [[IDX_TR:%.*]] = trunc i64 [[IDX:%.*]] to i32
; CHECK-NEXT:    [[D:%.*]] = shl i32 [[IDX_TR]], 2
; CHECK-NEXT:    ret i32 [[D]]
;
  %p2 = getelementptr inbounds [0 x i32], ptr %base, i64 0, i64 %idx
  %i1 = ptrtoint ptr %base to i64
  %i2 = ptrtoint ptr %p2 to i64
  %t1 = trunc i64 %i1 to i32
  %t2 = trunc i64 %i2 to i32
  %d = sub nuw i32 %t2, %t1
  ret i32 %d
}

define i64 @test_inbounds_nuw_swapped(ptr %base, i64 %idx) {
; CHECK-LABEL: @test_inbounds_nuw_swapped(
; CHECK-NEXT:    [[P2_IDX_NEG:%.*]] = mul i64 [[IDX:%.*]], -4
; CHECK-NEXT:    ret i64 [[P2_IDX_NEG]]
;
  %p2 = getelementptr inbounds [0 x i32], ptr %base, i64 0, i64 %idx
  %i1 = ptrtoint ptr %p2 to i64
  %i2 = ptrtoint ptr %base to i64
  %d = sub nuw i64 %i2, %i1
  ret i64 %d
}

define i64 @test_inbounds1_nuw_swapped(ptr %base, i64 %idx) {
; CHECK-LABEL: @test_inbounds1_nuw_swapped(
; CHECK-NEXT:    [[P2_IDX_NEG:%.*]] = mul i64 [[IDX:%.*]], -4
; CHECK-NEXT:    ret i64 [[P2_IDX_NEG]]
;
  %p2 = getelementptr [0 x i32], ptr %base, i64 0, i64 %idx
  %i1 = ptrtoint ptr %p2 to i64
  %i2 = ptrtoint ptr %base to i64
  %d = sub nuw i64 %i2, %i1
  ret i64 %d
}

define i64 @test_inbounds2_nuw_swapped(ptr %base, i64 %idx) {
; CHECK-LABEL: @test_inbounds2_nuw_swapped(
; CHECK-NEXT:    [[P2_IDX_NEG:%.*]] = mul i64 [[IDX:%.*]], -4
; CHECK-NEXT:    ret i64 [[P2_IDX_NEG]]
;
  %p2 = getelementptr inbounds [0 x i32], ptr %base, i64 0, i64 %idx
  %i1 = ptrtoint ptr %p2 to i64
  %i2 = ptrtoint ptr %base to i64
  %d = sub nuw i64 %i2, %i1
  ret i64 %d
}

define i64 @test_inbounds_two_gep(ptr %base, i64 %idx, i64 %idx2) {
; CHECK-LABEL: @test_inbounds_two_gep(
; CHECK-NEXT:    [[TMP1:%.*]] = sub nsw i64 [[IDX2:%.*]], [[IDX:%.*]]
; CHECK-NEXT:    [[GEPDIFF:%.*]] = shl nsw i64 [[TMP1]], 2
; CHECK-NEXT:    ret i64 [[GEPDIFF]]
;
  %p1 = getelementptr inbounds [0 x i32], ptr %base, i64 0, i64 %idx
  %p2 = getelementptr inbounds [0 x i32], ptr %base, i64 0, i64 %idx2
  %i1 = ptrtoint ptr %p1 to i64
  %i2 = ptrtoint ptr %p2 to i64
  %d = sub i64 %i2, %i1
  ret i64 %d
}

define i64 @test_inbounds_nsw_two_gep(ptr %base, i64 %idx, i64 %idx2) {
; CHECK-LABEL: @test_inbounds_nsw_two_gep(
; CHECK-NEXT:    [[TMP1:%.*]] = sub nsw i64 [[IDX2:%.*]], [[IDX:%.*]]
; CHECK-NEXT:    [[GEPDIFF:%.*]] = shl nsw i64 [[TMP1]], 2
; CHECK-NEXT:    ret i64 [[GEPDIFF]]
;
  %p1 = getelementptr inbounds [0 x i32], ptr %base, i64 0, i64 %idx
  %p2 = getelementptr inbounds [0 x i32], ptr %base, i64 0, i64 %idx2
  %i1 = ptrtoint ptr %p1 to i64
  %i2 = ptrtoint ptr %p2 to i64
  %d = sub nsw i64 %i2, %i1
  ret i64 %d
}

define i64 @test_inbounds_nuw_two_gep(ptr %base, i64 %idx, i64 %idx2) {
; CHECK-LABEL: @test_inbounds_nuw_two_gep(
; CHECK-NEXT:    [[TMP1:%.*]] = sub nsw i64 [[IDX2:%.*]], [[IDX:%.*]]
; CHECK-NEXT:    [[GEPDIFF:%.*]] = shl nsw i64 [[TMP1]], 2
; CHECK-NEXT:    ret i64 [[GEPDIFF]]
;
  %p1 = getelementptr inbounds [0 x i32], ptr %base, i64 0, i64 %idx
  %p2 = getelementptr inbounds [0 x i32], ptr %base, i64 0, i64 %idx2
  %i1 = ptrtoint ptr %p1 to i64
  %i2 = ptrtoint ptr %p2 to i64
  %d = sub nuw i64 %i2, %i1
  ret i64 %d
}

define i64 @test_inbounds_nuw_multi_index(ptr %base, i64 %idx, i64 %idx2) {
; CHECK-LABEL: @test_inbounds_nuw_multi_index(
; CHECK-NEXT:    [[P2_IDX:%.*]] = shl nsw i64 [[IDX:%.*]], 3
; CHECK-NEXT:    [[P2_IDX1:%.*]] = shl nsw i64 [[IDX2:%.*]], 2
; CHECK-NEXT:    [[P2_OFFS:%.*]] = add nsw i64 [[P2_IDX]], [[P2_IDX1]]
; CHECK-NEXT:    ret i64 [[P2_OFFS]]
;
  %p2 = getelementptr inbounds [0 x [2 x i32]], ptr %base, i64 0, i64 %idx, i64 %idx2
  %i1 = ptrtoint ptr %base to i64
  %i2 = ptrtoint ptr %p2 to i64
  %d = sub nuw i64 %i2, %i1
  ret i64 %d
}

; rdar://7362831
define i32 @test23(ptr %P, i64 %A){
; CHECK-LABEL: @test23(
; CHECK-NEXT:    [[G:%.*]] = trunc i64 [[A:%.*]] to i32
; CHECK-NEXT:    ret i32 [[G]]
;
  %B = getelementptr inbounds i8, ptr %P, i64 %A
  %C = ptrtoint ptr %B to i64
  %D = trunc i64 %C to i32
  %E = ptrtoint ptr %P to i64
  %F = trunc i64 %E to i32
  %G = sub i32 %D, %F
  ret i32 %G
}

define i8 @test23_as1(ptr addrspace(1) %P, i16 %A) {
; CHECK-LABEL: @test23_as1(
; CHECK-NEXT:    [[G:%.*]] = trunc i16 [[A:%.*]] to i8
; CHECK-NEXT:    ret i8 [[G]]
;
  %B = getelementptr inbounds i8, ptr addrspace(1) %P, i16 %A
  %C = ptrtoint ptr addrspace(1) %B to i16
  %D = trunc i16 %C to i8
  %E = ptrtoint ptr addrspace(1) %P to i16
  %F = trunc i16 %E to i8
  %G = sub i8 %D, %F
  ret i8 %G
}

define i64 @test24(ptr %P, i64 %A){
; CHECK-LABEL: @test24(
; CHECK-NEXT:    ret i64 [[A:%.*]]
;
  %B = getelementptr inbounds i8, ptr %P, i64 %A
  %C = ptrtoint ptr %B to i64
  %E = ptrtoint ptr %P to i64
  %G = sub i64 %C, %E
  ret i64 %G
}

define i16 @test24_as1(ptr addrspace(1) %P, i16 %A) {
; CHECK-LABEL: @test24_as1(
; CHECK-NEXT:    ret i16 [[A:%.*]]
;
  %B = getelementptr inbounds i8, ptr addrspace(1) %P, i16 %A
  %C = ptrtoint ptr addrspace(1) %B to i16
  %E = ptrtoint ptr addrspace(1) %P to i16
  %G = sub i16 %C, %E
  ret i16 %G
}

define i64 @test24a(ptr %P, i64 %A){
; CHECK-LABEL: @test24a(
; CHECK-NEXT:    [[DIFF_NEG:%.*]] = sub i64 0, [[A:%.*]]
; CHECK-NEXT:    ret i64 [[DIFF_NEG]]
;
  %B = getelementptr inbounds i8, ptr %P, i64 %A
  %C = ptrtoint ptr %B to i64
  %E = ptrtoint ptr %P to i64
  %G = sub i64 %E, %C
  ret i64 %G
}

define i16 @test24a_as1(ptr addrspace(1) %P, i16 %A) {
; CHECK-LABEL: @test24a_as1(
; CHECK-NEXT:    [[DIFF_NEG:%.*]] = sub i16 0, [[A:%.*]]
; CHECK-NEXT:    ret i16 [[DIFF_NEG]]
;
  %B = getelementptr inbounds i8, ptr addrspace(1) %P, i16 %A
  %C = ptrtoint ptr addrspace(1) %B to i16
  %E = ptrtoint ptr addrspace(1) %P to i16
  %G = sub i16 %E, %C
  ret i16 %G
}

@Arr = external global [42 x i16]

define i64 @test24b(ptr %P, i64 %A){
; CHECK-LABEL: @test24b(
; CHECK-NEXT:    [[B_IDX:%.*]] = shl nsw i64 [[A:%.*]], 1
; CHECK-NEXT:    ret i64 [[B_IDX]]
;
  %B = getelementptr inbounds [42 x i16], ptr @Arr, i64 0, i64 %A
  %C = ptrtoint ptr %B to i64
  %G = sub i64 %C, ptrtoint (ptr @Arr to i64)
  ret i64 %G
}

define i64 @test25(ptr %P, i64 %A){
; CHECK-LABEL: @test25(
; CHECK-NEXT:    [[B_IDX:%.*]] = shl nsw i64 [[A:%.*]], 1
; CHECK-NEXT:    [[GEPDIFF:%.*]] = add nsw i64 [[B_IDX]], -84
; CHECK-NEXT:    ret i64 [[GEPDIFF]]
;
  %B = getelementptr inbounds [42 x i16], ptr @Arr, i64 0, i64 %A
  %C = ptrtoint ptr %B to i64
  %G = sub i64 %C, ptrtoint (ptr getelementptr ([42 x i16], ptr @Arr, i64 1, i64 0) to i64)
  ret i64 %G
}

@Arr_as1 = external addrspace(1) global [42 x i16]

define i16 @test25_as1(ptr addrspace(1) %P, i64 %A) {
; CHECK-LABEL: @test25_as1(
; CHECK-NEXT:    [[TMP1:%.*]] = trunc i64 [[A:%.*]] to i16
; CHECK-NEXT:    [[B_IDX:%.*]] = shl nsw i16 [[TMP1]], 1
; CHECK-NEXT:    [[GEPDIFF:%.*]] = add nsw i16 [[B_IDX]], -84
; CHECK-NEXT:    ret i16 [[GEPDIFF]]
;
  %B = getelementptr inbounds [42 x i16], ptr addrspace(1) @Arr_as1, i64 0, i64 %A
  %C = ptrtoint ptr addrspace(1) %B to i16
  %G = sub i16 %C, ptrtoint (ptr addrspace(1) getelementptr ([42 x i16], ptr addrspace(1) @Arr_as1, i64 1, i64 0) to i16)
  ret i16 %G
}

define i64 @test30(ptr %foo, i64 %i, i64 %j) {
; CHECK-LABEL: @test30(
; CHECK-NEXT:    [[GEP1_IDX:%.*]] = shl nsw i64 [[I:%.*]], 2
; CHECK-NEXT:    [[GEPDIFF:%.*]] = sub nsw i64 [[GEP1_IDX]], [[J:%.*]]
; CHECK-NEXT:    ret i64 [[GEPDIFF]]
;
  %gep1 = getelementptr inbounds i32, ptr %foo, i64 %i
  %gep2 = getelementptr inbounds i8, ptr %foo, i64 %j
  %cast1 = ptrtoint ptr %gep1 to i64
  %cast2 = ptrtoint ptr %gep2 to i64
  %sub = sub i64 %cast1, %cast2
  ret i64 %sub
}

define i16 @test30_as1(ptr addrspace(1) %foo, i16 %i, i16 %j) {
; CHECK-LABEL: @test30_as1(
; CHECK-NEXT:    [[GEP1_IDX:%.*]] = shl nsw i16 [[I:%.*]], 2
; CHECK-NEXT:    [[GEPDIFF:%.*]] = sub nsw i16 [[GEP1_IDX]], [[J:%.*]]
; CHECK-NEXT:    ret i16 [[GEPDIFF]]
;
  %gep1 = getelementptr inbounds i32, ptr addrspace(1) %foo, i16 %i
  %gep2 = getelementptr inbounds i8, ptr addrspace(1) %foo, i16 %j
  %cast1 = ptrtoint ptr addrspace(1) %gep1 to i16
  %cast2 = ptrtoint ptr addrspace(1) %gep2 to i16
  %sub = sub i16 %cast1, %cast2
  ret i16 %sub
}

; Inbounds translates to 'nsw' on sub

define i64 @gep_diff_both_inbounds(ptr %foo, i64 %i, i64 %j) {
; CHECK-LABEL: @gep_diff_both_inbounds(
; CHECK-NEXT:    [[GEPDIFF:%.*]] = sub nsw i64 [[I:%.*]], [[J:%.*]]
; CHECK-NEXT:    ret i64 [[GEPDIFF]]
;
  %gep1 = getelementptr inbounds i8, ptr %foo, i64 %i
  %gep2 = getelementptr inbounds i8, ptr %foo, i64 %j
  %cast1 = ptrtoint ptr %gep1 to i64
  %cast2 = ptrtoint ptr %gep2 to i64
  %sub = sub i64 %cast1, %cast2
  ret i64 %sub
}

; Negative test for 'nsw' - both geps must be inbounds

define i64 @gep_diff_first_inbounds(ptr %foo, i64 %i, i64 %j) {
; CHECK-LABEL: @gep_diff_first_inbounds(
; CHECK-NEXT:    [[GEPDIFF:%.*]] = sub i64 [[I:%.*]], [[J:%.*]]
; CHECK-NEXT:    ret i64 [[GEPDIFF]]
;
  %gep1 = getelementptr inbounds i8, ptr %foo, i64 %i
  %gep2 = getelementptr i8, ptr %foo, i64 %j
  %cast1 = ptrtoint ptr %gep1 to i64
  %cast2 = ptrtoint ptr %gep2 to i64
  %sub = sub i64 %cast1, %cast2
  ret i64 %sub
}

; Negative test for 'nsw' - both geps must be inbounds

define i64 @gep_diff_second_inbounds(ptr %foo, i64 %i, i64 %j) {
; CHECK-LABEL: @gep_diff_second_inbounds(
; CHECK-NEXT:    [[GEPDIFF:%.*]] = sub i64 [[I:%.*]], [[J:%.*]]
; CHECK-NEXT:    ret i64 [[GEPDIFF]]
;
  %gep1 = getelementptr i8, ptr %foo, i64 %i
  %gep2 = getelementptr inbounds i8, ptr %foo, i64 %j
  %cast1 = ptrtoint ptr %gep1 to i64
  %cast2 = ptrtoint ptr %gep2 to i64
  %sub = sub i64 %cast1, %cast2
  ret i64 %sub
}

define i64 @gep_diff_with_bitcast(ptr %p, i64 %idx) {
; CHECK-LABEL: @gep_diff_with_bitcast(
; CHECK-NEXT:    ret i64 [[IDX:%.*]]
;
  %i1 = getelementptr inbounds [4 x i64], ptr %p, i64 %idx
  %i3 = ptrtoint ptr %i1 to i64
  %i4 = ptrtoint ptr %p to i64
  %i5 = sub nuw i64 %i3, %i4
  %i6 = lshr i64 %i5, 5
  ret i64 %i6
}

define i1 @_gep_phi1(ptr noundef %str1) {
; CHECK-LABEL: @_gep_phi1(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[CMP_I:%.*]] = icmp eq ptr [[STR1:%.*]], null
; CHECK-NEXT:    br i1 [[CMP_I]], label [[_Z3FOOPKC_EXIT:%.*]], label [[LOR_LHS_FALSE_I:%.*]]
; CHECK:       lor.lhs.false.i:
; CHECK-NEXT:    [[TMP0:%.*]] = load i8, ptr [[STR1]], align 1
; CHECK-NEXT:    [[CMP1_I:%.*]] = icmp eq i8 [[TMP0]], 0
; CHECK-NEXT:    br i1 [[CMP1_I]], label [[_Z3FOOPKC_EXIT]], label [[WHILE_COND_I:%.*]]
; CHECK:       while.cond.i:
; CHECK-NEXT:    [[A_PN_I:%.*]] = phi ptr [ [[TEST_0_I:%.*]], [[WHILE_COND_I]] ], [ [[STR1]], [[LOR_LHS_FALSE_I]] ]
; CHECK-NEXT:    [[TEST_0_I]] = getelementptr inbounds i8, ptr [[A_PN_I]], i64 1
; CHECK-NEXT:    [[TMP1:%.*]] = load i8, ptr [[TEST_0_I]], align 1
; CHECK-NEXT:    [[CMP3_NOT_I:%.*]] = icmp eq i8 [[TMP1]], 0
; CHECK-NEXT:    br i1 [[CMP3_NOT_I]], label [[WHILE_END_I:%.*]], label [[WHILE_COND_I]]
; CHECK:       while.end.i:
; CHECK-NEXT:    [[TMP2:%.*]] = icmp ne ptr [[TEST_0_I]], [[STR1]]
; CHECK-NEXT:    br label [[_Z3FOOPKC_EXIT]]
; CHECK:       _Z3fooPKc.exit:
; CHECK-NEXT:    [[RETVAL_0_I:%.*]] = phi i1 [ [[TMP2]], [[WHILE_END_I]] ], [ false, [[LOR_LHS_FALSE_I]] ], [ false, [[ENTRY:%.*]] ]
; CHECK-NEXT:    ret i1 [[RETVAL_0_I]]
;
entry:
  %cmp.i = icmp eq ptr %str1, null
  br i1 %cmp.i, label %_Z3fooPKc.exit, label %lor.lhs.false.i

lor.lhs.false.i:
  %0 = load i8, ptr %str1, align 1
  %cmp1.i = icmp eq i8 %0, 0
  br i1 %cmp1.i, label %_Z3fooPKc.exit, label %while.cond.i

while.cond.i:
  %a.pn.i = phi ptr [ %test.0.i, %while.cond.i ], [ %str1, %lor.lhs.false.i ]
  %test.0.i = getelementptr inbounds i8, ptr %a.pn.i, i64 1
  %1 = load i8, ptr %test.0.i, align 1
  %cmp3.not.i = icmp eq i8 %1, 0
  br i1 %cmp3.not.i, label %while.end.i, label %while.cond.i

while.end.i:
  %sub.ptr.lhs.cast.i = ptrtoint ptr %test.0.i to i64
  %sub.ptr.rhs.cast.i = ptrtoint ptr %str1 to i64
  %sub.ptr.sub.i = sub i64 %sub.ptr.lhs.cast.i, %sub.ptr.rhs.cast.i
  br label %_Z3fooPKc.exit

_Z3fooPKc.exit:
  %retval.0.i = phi i64 [ %sub.ptr.sub.i, %while.end.i ], [ 0, %lor.lhs.false.i ], [ 0, %entry ]
  %tobool = icmp ne i64 %retval.0.i, 0
  ret i1 %tobool
}

define i1 @_gep_phi2(ptr noundef %str1, i64 %val2) {
; CHECK-LABEL: @_gep_phi2(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[CMP_I:%.*]] = icmp eq ptr [[STR1:%.*]], null
; CHECK-NEXT:    br i1 [[CMP_I]], label [[_Z3FOOPKC_EXIT:%.*]], label [[LOR_LHS_FALSE_I:%.*]]
; CHECK:       lor.lhs.false.i:
; CHECK-NEXT:    [[TMP0:%.*]] = load i8, ptr [[STR1]], align 1
; CHECK-NEXT:    [[CMP1_I:%.*]] = icmp eq i8 [[TMP0]], 0
; CHECK-NEXT:    br i1 [[CMP1_I]], label [[_Z3FOOPKC_EXIT]], label [[WHILE_COND_I:%.*]]
; CHECK:       while.cond.i:
; CHECK-NEXT:    [[A_PN_I:%.*]] = phi ptr [ [[TEST_0_I:%.*]], [[WHILE_COND_I]] ], [ [[STR1]], [[LOR_LHS_FALSE_I]] ]
; CHECK-NEXT:    [[TEST_0_I]] = getelementptr inbounds i8, ptr [[A_PN_I]], i64 1
; CHECK-NEXT:    [[TMP1:%.*]] = load i8, ptr [[TEST_0_I]], align 1
; CHECK-NEXT:    [[CMP3_NOT_I:%.*]] = icmp eq i8 [[TMP1]], 0
; CHECK-NEXT:    br i1 [[CMP3_NOT_I]], label [[WHILE_END_I:%.*]], label [[WHILE_COND_I]]
; CHECK:       while.end.i:
; CHECK-NEXT:    [[SUB_PTR_LHS_CAST_I:%.*]] = ptrtoint ptr [[TEST_0_I]] to i64
; CHECK-NEXT:    [[SUB_PTR_RHS_CAST_I:%.*]] = ptrtoint ptr [[STR1]] to i64
; CHECK-NEXT:    [[SUB_PTR_SUB_I:%.*]] = sub i64 [[SUB_PTR_LHS_CAST_I]], [[SUB_PTR_RHS_CAST_I]]
; CHECK-NEXT:    br label [[_Z3FOOPKC_EXIT]]
; CHECK:       _Z3fooPKc.exit:
; CHECK-NEXT:    [[RETVAL_0_I:%.*]] = phi i64 [ [[SUB_PTR_SUB_I]], [[WHILE_END_I]] ], [ 0, [[LOR_LHS_FALSE_I]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[TMP2:%.*]] = or i64 [[RETVAL_0_I]], [[VAL2:%.*]]
; CHECK-NEXT:    [[TOBOOL:%.*]] = icmp eq i64 [[TMP2]], 0
; CHECK-NEXT:    ret i1 [[TOBOOL]]
;
entry:
  %cmp.i = icmp eq ptr %str1, null
  br i1 %cmp.i, label %_Z3fooPKc.exit, label %lor.lhs.false.i

lor.lhs.false.i:
  %0 = load i8, ptr %str1, align 1
  %cmp1.i = icmp eq i8 %0, 0
  br i1 %cmp1.i, label %_Z3fooPKc.exit, label %while.cond.i

while.cond.i:
  %a.pn.i = phi ptr [ %test.0.i, %while.cond.i ], [ %str1, %lor.lhs.false.i ]
  %test.0.i = getelementptr inbounds i8, ptr %a.pn.i, i64 1
  %1 = load i8, ptr %test.0.i, align 1
  %cmp3.not.i = icmp eq i8 %1, 0
  br i1 %cmp3.not.i, label %while.end.i, label %while.cond.i

while.end.i:
  %sub.ptr.lhs.cast.i = ptrtoint ptr %test.0.i to i64
  %sub.ptr.rhs.cast.i = ptrtoint ptr %str1 to i64
  %sub.ptr.sub.i = sub i64 %sub.ptr.lhs.cast.i, %sub.ptr.rhs.cast.i
  br label %_Z3fooPKc.exit

_Z3fooPKc.exit:
  %retval.0.i = phi i64 [ %sub.ptr.sub.i, %while.end.i ], [ 0, %lor.lhs.false.i ], [ 0, %entry ]
  %2 = or i64 %retval.0.i, %val2
  %tobool = icmp eq i64 %2, 0
  ret i1 %tobool
}