test/Transforms/CodeGenPrepare/X86/split-indirectbr-duplicate-pred.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
; RUN: opt -passes='require<profile-summary>,function(codegenprepare)' -S -mtriple=x86_64 < %s | FileCheck %s

; Test that SplitIndirectBrCriticalEdges does not crash when a predecessor
; block has a conditional branch with both targets pointing to the same
; destination (producing duplicate entries in the predecessor list).


define i32 @duplicate_pred_condbr(ptr %addr, i1 %cond) {
; CHECK-LABEL: define i32 @duplicate_pred_condbr(
; CHECK-SAME: ptr [[ADDR:%.*]], i1 [[COND:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    indirectbr ptr [[ADDR]], [label %[[TARGET:.*]], label %[[COND_BB:.*]]]
; CHECK:       [[COND_BB]]:
; CHECK-NEXT:    br [[DOTSPLIT:label %.*]]
; CHECK:       [[TARGET]]:
; CHECK-NEXT:    br [[DOTSPLIT]]
; CHECK:       [[_SPLIT:.*:]]
; CHECK-NEXT:    [[MERGE:%.*]] = phi i32 [ 0, %[[TARGET]] ], [ 1, %[[COND_BB]] ]
; CHECK-NEXT:    ret i32 [[MERGE]]
;
entry:
  indirectbr ptr %addr, [label %target, label %cond.bb]

cond.bb:
  br i1 %cond, label %target, label %target

target:
  %result = phi i32 [ 0, %entry ], [ 1, %cond.bb ], [ 1, %cond.bb ]
  ret i32 %result
}