llvm/test/Transforms/PhaseOrdering/X86/loop-vectorizer-noalias.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
; RUN: opt -S -O3 -mtriple=x86_64-unknown-linux-gnu < %s | FileCheck %s

define internal void @acc(ptr noalias noundef %val, ptr noalias noundef %prev) {
entry:
  %0 = load i8, ptr %prev, align 1
  %conv = zext i8 %0 to i32
  %1 = load i8, ptr %val, align 1
  %conv1 = zext i8 %1 to i32
  %add = add nsw i32 %conv1, %conv
  %conv2 = trunc i32 %add to i8
  store i8 %conv2, ptr %val, align 1
  ret void
}

; This loop should not get vectorized.
define void @accsum(ptr noundef %vals, i64 noundef %num) #0 {
; CHECK-LABEL: define void @accsum(
; CHECK-SAME: ptr nocapture noundef [[VALS:%.*]], i64 noundef [[NUM:%.*]]) local_unnamed_addr #[[ATTR0:[0-9]+]] {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[CMP1:%.*]] = icmp ugt i64 [[NUM]], 1
; CHECK-NEXT:    br i1 [[CMP1]], label [[FOR_BODY_PREHEADER:%.*]], label [[FOR_END:%.*]]
; CHECK:       for.body.preheader:
; CHECK-NEXT:    [[LOAD_INITIAL:%.*]] = load i8, ptr [[VALS]], align 1
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[STORE_FORWARDED:%.*]] = phi i8 [ [[LOAD_INITIAL]], [[FOR_BODY_PREHEADER]] ], [ [[ADD_I:%.*]], [[FOR_BODY]] ]
; CHECK-NEXT:    [[I_02:%.*]] = phi i64 [ 1, [[FOR_BODY_PREHEADER]] ], [ [[INC:%.*]], [[FOR_BODY]] ]
; CHECK-NEXT:    [[ARRAYIDX:%.*]] = getelementptr inbounds i8, ptr [[VALS]], i64 [[I_02]]
; CHECK-NEXT:    [[TMP0:%.*]] = load i8, ptr [[ARRAYIDX]], align 1, !alias.scope [[META0:![0-9]+]], !noalias [[META3:![0-9]+]]
; CHECK-NEXT:    [[ADD_I]] = add i8 [[TMP0]], [[STORE_FORWARDED]]
; CHECK-NEXT:    store i8 [[ADD_I]], ptr [[ARRAYIDX]], align 1, !alias.scope [[META0]], !noalias [[META3]]
; CHECK-NEXT:    [[INC]] = add nuw i64 [[I_02]], 1
; CHECK-NEXT:    [[EXITCOND_NOT:%.*]] = icmp eq i64 [[INC]], [[NUM]]
; CHECK-NEXT:    br i1 [[EXITCOND_NOT]], label [[FOR_END]], label [[FOR_BODY]]
; CHECK:       for.end:
; CHECK-NEXT:    ret void
;
entry:
  br label %for.cond

for.cond:                                         ; preds = %for.inc, %entry
  %i.0 = phi i64 [ 1, %entry ], [ %inc, %for.inc ]
  %cmp = icmp ult i64 %i.0, %num
  br i1 %cmp, label %for.body, label %for.cond.cleanup

for.cond.cleanup:                                 ; preds = %for.cond
  br label %for.end

for.body:                                         ; preds = %for.cond
  %arrayidx = getelementptr inbounds i8, ptr %vals, i64 %i.0
  %sub = sub i64 %i.0, 1
  %arrayidx1 = getelementptr inbounds i8, ptr %vals, i64 %sub
  call void @acc(ptr noundef %arrayidx, ptr noundef %arrayidx1)
  br label %for.inc

for.inc:                                          ; preds = %for.body
  %inc = add i64 %i.0, 1
  br label %for.cond

for.end:                                          ; preds = %for.cond.cleanup
  ret void
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

attributes #0 = { "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87"}
;.
; CHECK: [[META0]] = !{[[META1:![0-9]+]]}
; CHECK: [[META1]] = distinct !{[[META1]], [[META2:![0-9]+]], !"acc: %val"}
; CHECK: [[META2]] = distinct !{[[META2]], !"acc"}
; CHECK: [[META3]] = !{[[META4:![0-9]+]]}
; CHECK: [[META4]] = distinct !{[[META4]], [[META2]], !"acc: %prev"}
;.