llvm/test/Transforms/Mem2Reg/single-store.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
; RUN: opt -S -passes=mem2reg < %s | FileCheck %s

define i8 @single_store_literal_poison(i1 %cond) {
; CHECK-LABEL: define i8 @single_store_literal_poison(
; CHECK-SAME: i1 [[COND:%.*]]) {
; CHECK-NEXT:    br i1 [[COND]], label %[[IF:.*]], label %[[EXIT:.*]]
; CHECK:       [[IF]]:
; CHECK-NEXT:    br label %[[EXIT]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    ret i8 undef
;
  %a = alloca i8, align 1
  br i1 %cond, label %if, label %exit

if:
  store i8 poison, ptr %a, align 1
  br label %exit

exit:
  %v = load i8, ptr %a, align 1
  ret i8 %v
}

; FIXME: This is a miscompile.
define i8 @single_store_maybe_poison(i1 %cond, i8 %x) {
; CHECK-LABEL: define i8 @single_store_maybe_poison(
; CHECK-SAME: i1 [[COND:%.*]], i8 [[X:%.*]]) {
; CHECK-NEXT:    br i1 [[COND]], label %[[IF:.*]], label %[[EXIT:.*]]
; CHECK:       [[IF]]:
; CHECK-NEXT:    br label %[[EXIT]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    [[A_0:%.*]] = phi i8 [ [[X]], %[[IF]] ], [ undef, [[TMP0:%.*]] ]
; CHECK-NEXT:    ret i8 [[A_0]]
;
  %a = alloca i8, align 1
  br i1 %cond, label %if, label %exit

if:
  store i8 %x, ptr %a, align 1
  br label %exit

exit:
  %v = load i8, ptr %a, align 1
  ret i8 %v
}

define i8 @single_store_cant_be_poison(i1 %cond, i8 noundef %x) {
; CHECK-LABEL: define i8 @single_store_cant_be_poison(
; CHECK-SAME: i1 [[COND:%.*]], i8 noundef [[X:%.*]]) {
; CHECK-NEXT:    br i1 [[COND]], label %[[IF:.*]], label %[[EXIT:.*]]
; CHECK:       [[IF]]:
; CHECK-NEXT:    br label %[[EXIT]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    ret i8 [[X]]
;
  %a = alloca i8, align 1
  br i1 %cond, label %if, label %exit

if:
  store i8 %x, ptr %a, align 1
  br label %exit

exit:
  %v = load i8, ptr %a, align 1
  ret i8 %v
}