llvm/test/Transforms/SROA/sroa-self-referential-load.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
; RUN: opt --passes=sroa -S < %s | FileCheck %s

; Ensure no crash when a store's value operand is the load being promoted,
; creating a self-referential cycle in unreachable code.

define i32 @func(i64 %iv) {
; CHECK-LABEL: define i32 @func(
; CHECK-SAME: i64 [[IV:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    [[A:%.*]] = alloca [2 x i32], align 4
; CHECK-NEXT:    br label %[[LOOP:.*]]
; CHECK:       [[LOOP]]:
; CHECK-NEXT:    br label %[[LOOP]]
; CHECK:       [[EXIT:.*]]:
; CHECK-NEXT:    store i32 poison, ptr [[A]], align 4
; CHECK-NEXT:    br label %[[EXIT]]
; CHECK:       [[DEAD:.*]]:
; CHECK-NEXT:    br label %[[DEAD]]
; CHECK:       [[USE:.*]]:
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr [4 x i8], ptr [[A]], i64 [[IV]]
; CHECK-NEXT:    [[TMP0:%.*]] = load i32, ptr [[GEP]], align 4
; CHECK-NEXT:    br i1 false, label %[[USE]], label %[[DEAD]]
;
entry:
  %a = alloca [2 x i32], align 4
  br label %loop

loop:
  br label %loop

exit:
  store i32 %0, ptr %a, align 4
  %0 = load i32, ptr %a, align 4
  br label %exit

dead:
  br label %dead

use:
  %gep = getelementptr [4 x i8], ptr %a, i64 %iv
  %1 = load i32, ptr %gep, align 4
  br i1 false, label %use, label %dead
}