; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -mergeicmps -verify-dom-info -mtriple=x86_64-unknown-unknown -S | FileCheck %s

%S = type { i32, i32, i32, i32 }

; The entry block is part of the chain. It however can not be merged. We need to
; make sure that the control flow is still consistent (goes through each of the
; blocks).

define zeroext i1 @opeq1(
; CHECK-LABEL: @opeq1(
; CHECK-NEXT:  "land.rhs.i+land.rhs.i.2":
; CHECK-NEXT:    [[TMP0:%.*]] = getelementptr inbounds [[S:%.*]], %S* [[A:%.*]], i64 0, i32 0
; CHECK-NEXT:    [[TMP1:%.*]] = getelementptr inbounds [[S]], %S* [[B:%.*]], i64 0, i32 0
; CHECK-NEXT:    [[CSTR:%.*]] = bitcast i32* [[TMP0]] to i8*
; CHECK-NEXT:    [[CSTR3:%.*]] = bitcast i32* [[TMP1]] to i8*
; CHECK-NEXT:    [[MEMCMP:%.*]] = call i32 @memcmp(i8* [[CSTR]], i8* [[CSTR3]], i64 8)
; CHECK-NEXT:    [[TMP2:%.*]] = icmp eq i32 [[MEMCMP]], 0
; CHECK-NEXT:    br i1 [[TMP2]], label [[ENTRY2:%.*]], label [[OPEQ1_EXIT:%.*]]
; CHECK:       entry2:
; CHECK-NEXT:    [[TMP3:%.*]] = getelementptr inbounds [[S]], %S* [[A]], i64 0, i32 3
; CHECK-NEXT:    [[TMP4:%.*]] = getelementptr inbounds [[S]], %S* [[B]], i64 0, i32 2
; CHECK-NEXT:    [[TMP5:%.*]] = load i32, i32* [[TMP3]], align 4
; CHECK-NEXT:    [[TMP6:%.*]] = load i32, i32* [[TMP4]], align 4
; CHECK-NEXT:    [[TMP7:%.*]] = icmp eq i32 [[TMP5]], [[TMP6]]
; CHECK-NEXT:    br i1 [[TMP7]], label [[LAND_RHS_I_31:%.*]], label [[OPEQ1_EXIT]]
; CHECK:       land.rhs.i.31:
; CHECK-NEXT:    [[TMP8:%.*]] = getelementptr inbounds [[S]], %S* [[A]], i64 0, i32 3
; CHECK-NEXT:    [[TMP9:%.*]] = getelementptr inbounds [[S]], %S* [[B]], i64 0, i32 3
; CHECK-NEXT:    [[TMP10:%.*]] = load i32, i32* [[TMP8]], align 4
; CHECK-NEXT:    [[TMP11:%.*]] = load i32, i32* [[TMP9]], align 4
; CHECK-NEXT:    [[TMP12:%.*]] = icmp eq i32 [[TMP10]], [[TMP11]]
; CHECK-NEXT:    br label [[OPEQ1_EXIT]]
; CHECK:       opeq1.exit:
; CHECK-NEXT:    [[TMP13:%.*]] = phi i1 [ [[TMP12]], [[LAND_RHS_I_31]] ], [ false, [[ENTRY2]] ], [ false, %"land.rhs.i+land.rhs.i.2" ]
; CHECK-NEXT:    ret i1 [[TMP13]]
;
  %S* nocapture readonly dereferenceable(16) %a,
  %S* nocapture readonly dereferenceable(16) %b) local_unnamed_addr #0 {
entry:
  %first.i = getelementptr inbounds %S, %S* %a, i64 0, i32 3
  %0 = load i32, i32* %first.i, align 4
  %first1.i = getelementptr inbounds %S, %S* %b, i64 0, i32 2
  %1 = load i32, i32* %first1.i, align 4
  %cmp.i = icmp eq i32 %0, %1
  br i1 %cmp.i, label %land.rhs.i, label %opeq1.exit

land.rhs.i:
  %second.i = getelementptr inbounds %S, %S* %a, i64 0, i32 0
  %2 = load i32, i32* %second.i, align 4
  %second2.i = getelementptr inbounds %S, %S* %b, i64 0, i32 0
  %3 = load i32, i32* %second2.i, align 4
  %cmp3.i = icmp eq i32 %2, %3
  br i1 %cmp3.i, label %land.rhs.i.2, label %opeq1.exit

land.rhs.i.2:
  %third.i = getelementptr inbounds %S, %S* %a, i64 0, i32 1
  %4 = load i32, i32* %third.i, align 4
  %third2.i = getelementptr inbounds %S, %S* %b, i64 0, i32 1
  %5 = load i32, i32* %third2.i, align 4
  %cmp4.i = icmp eq i32 %4, %5
  br i1 %cmp4.i, label %land.rhs.i.3, label %opeq1.exit

land.rhs.i.3:
  %fourth.i = getelementptr inbounds %S, %S* %a, i64 0, i32 3
  %6 = load i32, i32* %fourth.i, align 4
  %fourth2.i = getelementptr inbounds %S, %S* %b, i64 0, i32 3
  %7 = load i32, i32* %fourth2.i, align 4
  %cmp5.i = icmp eq i32 %6, %7
  br label %opeq1.exit

opeq1.exit:
  %8 = phi i1 [ false, %entry ], [ false,  %land.rhs.i], [ false, %land.rhs.i.2 ], [ %cmp5.i, %land.rhs.i.3 ]
  ret i1 %8
}