test/Transforms/LICM/hoist-metadata.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals --version 2
; RUN: opt -S -passes=licm < %s| FileCheck %s

declare void @foo(...) memory(none)

; We can preserve all metadata on instructions that are guaranteed to execute.
define void @test_unconditional(i1 %c, ptr dereferenceable(8) align 8 %p) {
; CHECK-LABEL: define void @test_unconditional
; CHECK-SAME: (i1 [[C:%.*]], ptr align 8 dereferenceable(8) [[P:%.*]]) {
; CHECK-NEXT:    [[V1:%.*]] = load i32, ptr [[P]], align 4, !range [[RNG0:![0-9]+]]
; CHECK-NEXT:    [[V2:%.*]] = load ptr, ptr [[P]], align 8, !nonnull [[META1:![0-9]+]], !noundef [[META1]]
; CHECK-NEXT:    [[V3:%.*]] = load ptr, ptr [[P]], align 8, !dereferenceable [[META2:![0-9]+]], !align [[META2]]
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    call void @foo(i32 [[V1]], ptr [[V2]], ptr [[V3]])
; CHECK-NEXT:    br i1 [[C]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
  br label %loop

loop:
  %v1 = load i32, ptr %p, !range !{i32 0, i32 10}
  %v2 = load ptr, ptr %p, !nonnull !{}, !noundef !{}
  %v3 = load ptr, ptr %p, !align !{i64 4}, !dereferenceable !{i64 4}
  call void @foo(i32 %v1, ptr %v2, ptr %v3)
  br i1 %c, label %loop, label %exit

exit:
  ret void
}

; We cannot preserve UB-implying metadata on instructions that are speculated.
; However, we can preserve poison-implying metadata.
define void @test_conditional(i1 %c, i1 %c2, ptr dereferenceable(8) align 8 %p) {
; CHECK-LABEL: define void @test_conditional
; CHECK-SAME: (i1 [[C:%.*]], i1 [[C2:%.*]], ptr align 8 dereferenceable(8) [[P:%.*]]) {
; CHECK-NEXT:    [[V1:%.*]] = load i32, ptr [[P]], align 4, !range [[RNG0]]
; CHECK-NEXT:    [[V2:%.*]] = load ptr, ptr [[P]], align 8, !nonnull [[META1]]
; CHECK-NEXT:    [[V3:%.*]] = load ptr, ptr [[P]], align 8, !align [[META2]]
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    br i1 [[C]], label [[IF:%.*]], label [[LATCH:%.*]]
; CHECK:       if:
; CHECK-NEXT:    call void @foo(i32 [[V1]], ptr [[V2]], ptr [[V3]])
; CHECK-NEXT:    br label [[LATCH]]
; CHECK:       latch:
; CHECK-NEXT:    br i1 [[C2]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
  br label %loop

loop:
  br i1 %c, label %if, label %latch

if:
  %v1 = load i32, ptr %p, !range !{i32 0, i32 10}
  %v2 = load ptr, ptr %p, !nonnull !{}, !noundef !{}
  %v3 = load ptr, ptr %p, !align !{i64 4}, !dereferenceable !{i64 4}
  call void @foo(i32 %v1, ptr %v2, ptr %v3)
  br label %latch

latch:
  br i1 %c2, label %loop, label %exit

exit:
  ret void
}

declare i16 @e(i32)

; FIXME: alias metadata violations are UB, so should not be set on the hoisted
; load, as it may not execute.
define void @noalias_metadata_load_may_not_execute() {
; CHECK-LABEL: define void @noalias_metadata_load_may_not_execute() {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[A:%.*]] = alloca i32, align 16
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr inbounds i32, ptr [[A]]
; CHECK-NEXT:    [[GEP_PROMOTED:%.*]] = load i32, ptr [[GEP]], align 4
; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
; CHECK:       loop.header:
; CHECK-NEXT:    [[ADD1:%.*]] = phi i32 [ [[GEP_PROMOTED]], [[ENTRY:%.*]] ], [ [[ADD:%.*]], [[LOOP_LATCH:%.*]] ]
; CHECK-NEXT:    [[IV:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[IV_NEXT:%.*]], [[LOOP_LATCH]] ]
; CHECK-NEXT:    [[CALL:%.*]] = call signext i16 @e(i32 [[IV]])
; CHECK-NEXT:    [[C:%.*]] = icmp eq i16 [[CALL]], 0
; CHECK-NEXT:    br i1 [[C]], label [[LOOP_LATCH]], label [[EXIT:%.*]]
; CHECK:       loop.latch:
; CHECK-NEXT:    [[ADD]] = add i32 [[ADD1]], 1
; CHECK-NEXT:    [[IV_NEXT]] = add i32 [[IV]], 1
; CHECK-NEXT:    [[CMP:%.*]] = icmp ult i32 [[IV]], 100
; CHECK-NEXT:    br i1 [[CMP]], label [[LOOP_HEADER]], label [[EXIT]]
; CHECK:       exit:
; CHECK-NEXT:    [[ADD2:%.*]] = phi i32 [ [[ADD]], [[LOOP_LATCH]] ], [ [[ADD1]], [[LOOP_HEADER]] ]
; CHECK-NEXT:    store i32 [[ADD2]], ptr [[GEP]], align 4
; CHECK-NEXT:    ret void
;
entry:
  %a = alloca i32, align 16
  br label %loop.header

loop.header:
  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop.latch ]
  %call = call signext i16 @e(i32 %iv)
  %c = icmp eq i16 %call, 0
  br i1 %c, label %loop.latch, label %exit

loop.latch:
  %gep = getelementptr inbounds i32, ptr %a
  %l = load i32, ptr %gep, !tbaa !0, !noalias !4
  %add = add i32 %l, 1
  store i32 %add, ptr %gep, align 4, !tbaa !0, !noalias !4
  %iv.next = add i32 %iv, 1
  %cmp = icmp ult i32 %iv, 100
  br i1 %cmp, label %loop.header, label %exit

exit:
  ret void
}


!0 = !{!1, !1, i64 0}
!1 = !{!"short", !2, i64 0}
!2 = !{!"omnipotent char", !3, i64 0}
!3 = !{!"Simple C/C++ TBAA"}
!4 = !{!5}
!5 = distinct !{!5, !6}
!6 = distinct !{!6}
;.
; CHECK: attributes #[[ATTR0:[0-9]+]] = { memory(none) }
;.
; CHECK: [[RNG0]] = !{i32 0, i32 10}
; CHECK: [[META1]] = !{}
; CHECK: [[META2]] = !{i64 4}
;.