File: 2003-04-18-DeadBlockProblem.ll

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llvm-toolchain-17 1%3A17.0.6-22
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; This testcases makes sure that mem2reg can handle unreachable blocks.
; RUN: opt < %s -passes=mem2reg -S | FileCheck %s

define i32 @test() {
; CHECK-LABEL: @test(
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       Loop:
; CHECK-NEXT:    br label [[ENDOFLOOP:%.*]]
; CHECK:       Unreachable:
; CHECK-NEXT:    br label [[ENDOFLOOP]]
; CHECK:       EndOfLoop:
; CHECK-NEXT:    br label [[LOOP]]
;
  %X = alloca i32		; <ptr> [#uses=2]
  store i32 6, ptr %X
  br label %Loop
Loop:		; preds = %EndOfLoop, %0
  store i32 5, ptr %X
  br label %EndOfLoop
Unreachable:		; No predecessors!
  br label %EndOfLoop
EndOfLoop:		; preds = %Unreachable, %Loop
  br label %Loop
}