llvm/test/Transforms/LoopLoadElim/mixed-width-clobber.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
; RUN: opt -passes=loop-load-elim -S < %s | FileCheck %s
;
; Do not forward a load with a non-forwardable store-to-load dependence.

define void @zero_distance_clobber(ptr noalias %A, ptr noalias %Out, i64 %N) {
; CHECK-LABEL: define void @zero_distance_clobber(
; CHECK-SAME: ptr noalias [[A:%.*]], ptr noalias [[OUT:%.*]], i64 [[N:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br label %[[LOOP:.*]]
; CHECK:       [[LOOP]]:
; CHECK-NEXT:    [[I:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[I_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[P:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[I]]
; CHECK-NEXT:    store i8 7, ptr [[P]], align 1
; CHECK-NEXT:    [[X:%.*]] = load i32, ptr [[P]], align 4
; CHECK-NEXT:    [[Z:%.*]] = add i32 [[X]], 1
; CHECK-NEXT:    [[I_NEXT]] = add nuw nsw i64 [[I]], 1
; CHECK-NEXT:    [[P_NEXT:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[I_NEXT]]
; CHECK-NEXT:    store i32 [[Z]], ptr [[P_NEXT]], align 4
; CHECK-NEXT:    [[RESULT:%.*]] = getelementptr inbounds i32, ptr [[OUT]], i64 [[I]]
; CHECK-NEXT:    store i32 [[Z]], ptr [[RESULT]], align 4
; CHECK-NEXT:    [[C:%.*]] = icmp ult i64 [[I_NEXT]], [[N]]
; CHECK-NEXT:    br i1 [[C]], label %[[LOOP]], label %[[EXIT:.*]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    ret void
;
entry:
  br label %loop

loop:
  %i = phi i64 [ 0, %entry ], [ %i.next, %loop ]
  %p = getelementptr inbounds i32, ptr %A, i64 %i
  store i8 7, ptr %p, align 1
  %x = load i32, ptr %p, align 4
  %z = add i32 %x, 1
  %i.next = add nuw nsw i64 %i, 1
  %p.next = getelementptr inbounds i32, ptr %A, i64 %i.next
  store i32 %z, ptr %p.next, align 4
  %result = getelementptr inbounds i32, ptr %Out, i64 %i
  store i32 %z, ptr %result, align 4
  %c = icmp ult i64 %i.next, %N
  br i1 %c, label %loop, label %exit

exit:
  ret void
}

define void @nonzero_distance_clobber(ptr noalias %A, ptr noalias %Out,
; CHECK-LABEL: define void @nonzero_distance_clobber(
; CHECK-SAME: ptr noalias [[A:%.*]], ptr noalias [[OUT:%.*]], i64 [[N:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br label %[[LOOP:.*]]
; CHECK:       [[LOOP]]:
; CHECK-NEXT:    [[I:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[I_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[P:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[I]]
; CHECK-NEXT:    [[I_NEXT]] = add nuw nsw i64 [[I]], 1
; CHECK-NEXT:    [[P_NEXT:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[I_NEXT]]
; CHECK-NEXT:    store i32 42, ptr [[P_NEXT]], align 4
; CHECK-NEXT:    store i8 7, ptr [[P_NEXT]], align 1
; CHECK-NEXT:    [[X:%.*]] = load i32, ptr [[P]], align 4
; CHECK-NEXT:    [[Z:%.*]] = add i32 [[X]], 1
; CHECK-NEXT:    [[RESULT:%.*]] = getelementptr inbounds i32, ptr [[OUT]], i64 [[I]]
; CHECK-NEXT:    store i32 [[Z]], ptr [[RESULT]], align 4
; CHECK-NEXT:    [[C:%.*]] = icmp ult i64 [[I_NEXT]], [[N]]
; CHECK-NEXT:    br i1 [[C]], label %[[LOOP]], label %[[EXIT:.*]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    ret void
;
  i64 %N) {
entry:
  br label %loop

loop:
  %i = phi i64 [ 0, %entry ], [ %i.next, %loop ]
  %p = getelementptr inbounds i32, ptr %A, i64 %i
  %i.next = add nuw nsw i64 %i, 1
  %p.next = getelementptr inbounds i32, ptr %A, i64 %i.next
  store i32 42, ptr %p.next, align 4
  store i8 7, ptr %p.next, align 1
  %x = load i32, ptr %p, align 4
  %z = add i32 %x, 1
  %result = getelementptr inbounds i32, ptr %Out, i64 %i
  store i32 %z, ptr %result, align 4
  %c = icmp ult i64 %i.next, %N
  br i1 %c, label %loop, label %exit

exit:
  ret void
}

define void @overwritten_clobber(ptr noalias %A, ptr noalias %Out, i64 %N) {
; CHECK-LABEL: define void @overwritten_clobber(
; CHECK-SAME: ptr noalias [[A:%.*]], ptr noalias [[OUT:%.*]], i64 [[N:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br label %[[LOOP:.*]]
; CHECK:       [[LOOP]]:
; CHECK-NEXT:    [[I:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[I_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[P:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[I]]
; CHECK-NEXT:    [[I_NEXT]] = add nuw nsw i64 [[I]], 1
; CHECK-NEXT:    [[P_NEXT:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[I_NEXT]]
; CHECK-NEXT:    store i8 7, ptr [[P_NEXT]], align 1
; CHECK-NEXT:    store i32 42, ptr [[P_NEXT]], align 4
; CHECK-NEXT:    [[X:%.*]] = load i32, ptr [[P]], align 4
; CHECK-NEXT:    [[Z:%.*]] = add i32 [[X]], 1
; CHECK-NEXT:    [[RESULT:%.*]] = getelementptr inbounds i32, ptr [[OUT]], i64 [[I]]
; CHECK-NEXT:    store i32 [[Z]], ptr [[RESULT]], align 4
; CHECK-NEXT:    [[C:%.*]] = icmp ult i64 [[I_NEXT]], [[N]]
; CHECK-NEXT:    br i1 [[C]], label %[[LOOP]], label %[[EXIT:.*]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    ret void
;
entry:
  br label %loop

loop:
  %i = phi i64 [ 0, %entry ], [ %i.next, %loop ]
  %p = getelementptr inbounds i32, ptr %A, i64 %i
  %i.next = add nuw nsw i64 %i, 1
  %p.next = getelementptr inbounds i32, ptr %A, i64 %i.next
  store i8 7, ptr %p.next, align 1
  store i32 42, ptr %p.next, align 4
  %x = load i32, ptr %p, align 4
  %z = add i32 %x, 1
  %result = getelementptr inbounds i32, ptr %Out, i64 %i
  store i32 %z, ptr %result, align 4
  %c = icmp ult i64 %i.next, %N
  br i1 %c, label %loop, label %exit

exit:
  ret void
}