llvm/test/Analysis/MemorySSA/call-loop-carried-dependency.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-inst-comments --version 6
; RUN: opt -passes='print<memoryssa-walker>' -disable-output < %s 2>&1 | FileCheck %s

; Make sure that the memcpy is clobbered by the memoryphi, not by liveOnEntry.
define void @test(i1 %c, ptr %path, ptr %name) {
; CHECK-LABEL: define void @test(
; CHECK-SAME: i1 [[C:%.*]], ptr [[PATH:%.*]], ptr [[NAME:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    [[TMP:%.*]] = alloca [260 x i8], align 16
; CHECK-NEXT:    br label %[[WHILE_BODY:.*]]
; CHECK:       [[WHILE_BODY]]:
; CHECK-NEXT:  ; 3 = MemoryPhi({entry,liveOnEntry},{while.body,1})
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], %[[WHILE_BODY]] ], [ 259, %[[ENTRY]] ]
; CHECK-NEXT:    [[IV_NEXT]] = add nsw i64 [[IV]], -1
; CHECK-NEXT:    [[TMP_IV:%.*]] = getelementptr inbounds [260 x i8], ptr [[TMP]], i64 0, i64 [[IV]]
; CHECK-NEXT:  ; 1 = MemoryDef(3)->3 - clobbered by 3 = MemoryPhi({entry,liveOnEntry},{while.body,1})
; CHECK-NEXT:    store i8 42, ptr [[TMP_IV]], align 1
; CHECK-NEXT:    br i1 [[C]], label %[[WHILE_BODY]], label %[[EXIT:.*]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    [[TMP_IV_1:%.*]] = getelementptr inbounds i8, ptr [[TMP_IV]], i64 1
; CHECK-NEXT:    [[SUB7:%.*]] = sub nsw i64 259, [[IV]]
; CHECK-NEXT:  ; 2 = MemoryDef(1)->3 - clobbered by 3 = MemoryPhi({entry,liveOnEntry},{while.body,1})
; CHECK-NEXT:    call void @llvm.memcpy.p0.p0.i64(ptr align 1 [[NAME]], ptr nonnull align 1 [[TMP_IV_1]], i64 [[SUB7]], i1 false)
; CHECK-NEXT:    ret void
;
entry:
  %tmp = alloca [260 x i8], align 16
  br label %while.body

while.body:
  %iv = phi i64 [ %iv.next, %while.body ], [ 259, %entry ]
  %iv.next = add nsw i64 %iv, -1
  %tmp.iv = getelementptr inbounds [260 x i8], ptr %tmp, i64 0, i64 %iv
  store i8 42, ptr %tmp.iv, align 1
  br i1 %c, label %while.body, label %exit

exit:
  %tmp.iv.1 = getelementptr inbounds i8, ptr %tmp.iv, i64 1
  %sub7 = sub nsw i64 259, %iv
  call void @llvm.memcpy(ptr align 1 %name, ptr nonnull align 1 %tmp.iv.1, i64 %sub7, i1 false)
  ret void
}