llvm/test/Transforms/JumpThreading/noalias-scope-decl.ll

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

; Threading a loop exit (via cloneInstructions) must clone the block's noalias
; scope declarations so the threaded copy does not share the original's scopes.
define void @test(ptr %ptr) {
; CHECK-LABEL: @test(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    call void @llvm.experimental.noalias.scope.decl(metadata [[META0:![0-9]+]])
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[I:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[I_INC:%.*]], [[LATCH:%.*]] ]
; CHECK-NEXT:    [[C:%.*]] = icmp eq i32 [[I]], 100
; CHECK-NEXT:    br i1 [[C]], label [[EXIT:%.*]], label [[LATCH]]
; CHECK:       latch:
; CHECK-NEXT:    call void @llvm.experimental.noalias.scope.decl(metadata [[META3:![0-9]+]])
; CHECK-NEXT:    store i8 0, ptr [[PTR:%.*]], align 1, !noalias [[META0]]
; CHECK-NEXT:    store i8 1, ptr [[PTR]], align 1, !noalias [[META3]]
; CHECK-NEXT:    [[I_INC]] = add i32 [[I]], 1
; CHECK-NEXT:    br label [[LOOP]]
; CHECK:       exit:
; CHECK-NEXT:    call void @llvm.experimental.noalias.scope.decl(metadata [[META5:![0-9]+]])
; CHECK-NEXT:    store i8 0, ptr [[PTR]], align 1, !noalias [[META0]]
; CHECK-NEXT:    store i8 1, ptr [[PTR]], align 1, !noalias [[META5]]
; CHECK-NEXT:    ret void
;
entry:
  call void @llvm.experimental.noalias.scope.decl(metadata !0)
  br label %loop

loop:
  %i = phi i32 [ 0, %entry ], [ %i.inc, %latch ]
  %c = icmp eq i32 %i, 100
  br i1 %c, label %if, label %latch

if:
  br label %latch

latch:
  %p = phi i1 [ true, %if ], [ false, %loop ]
  call void @llvm.experimental.noalias.scope.decl(metadata !3)
  store i8 0, ptr %ptr, !noalias !0
  store i8 1, ptr %ptr, !noalias !3
  %i.inc = add i32 %i, 1
  br i1 %p, label %exit, label %loop

exit:
  ret void
}

; duplicateCondBranchOnPHIIntoPred duplicates a block whose conditional branch
; is on a PHI of non-constant values into a predecessor. It must likewise clone
; the block's noalias scope declarations, otherwise the duplicate shares the
; original's scope MDNodes and alias analysis can wrongly conclude two accesses
; on different paths do not alias.
define void @dup_clones_noalias_scope(ptr %p) {
; CHECK-LABEL: @dup_clones_noalias_scope(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[C:%.*]] = call i1 @opaque()
; CHECK-NEXT:    br i1 [[C]], label [[PRED:%.*]], label [[BB:%.*]]
; CHECK:       pred:
; CHECK-NEXT:    [[PV:%.*]] = call i1 @opaque()
; CHECK-NEXT:    call void @llvm.experimental.noalias.scope.decl(metadata [[META7:![0-9]+]])
; CHECK-NEXT:    store i8 0, ptr [[P:%.*]], align 1, !noalias [[META7]]
; CHECK-NEXT:    br i1 [[PV]], label [[TB:%.*]], label [[FB:%.*]]
; CHECK:       bb:
; CHECK-NEXT:    [[OV:%.*]] = call i1 @opaque()
; CHECK-NEXT:    call void @llvm.experimental.noalias.scope.decl(metadata [[META0]])
; CHECK-NEXT:    store i8 0, ptr [[P]], align 1, !noalias [[META0]]
; CHECK-NEXT:    br i1 [[OV]], label [[TB]], label [[FB]]
; CHECK:       tb:
; CHECK-NEXT:    ret void
; CHECK:       fb:
; CHECK-NEXT:    ret void
;
entry:
  %c = call i1 @opaque()
  br i1 %c, label %pred, label %other

pred:
  %pv = call i1 @opaque()
  br label %bb

other:
  %ov = call i1 @opaque()
  br label %bb

bb:
  %x = phi i1 [ %pv, %pred ], [ %ov, %other ]
  call void @llvm.experimental.noalias.scope.decl(metadata !0)
  store i8 0, ptr %p, !noalias !0
  br i1 %x, label %tb, label %fb

tb:
  ret void

fb:
  ret void
}

declare i1 @opaque()
declare void @llvm.experimental.noalias.scope.decl(metadata)

!0 = !{!1}
!1 = distinct !{!1, !2, !"scope1"}
!2 = distinct !{!2, !"domain"}
!3 = !{!4}
!4 = distinct !{!4, !2, !"scope2"}
;.
; CHECK: attributes #[[ATTR0:[0-9]+]] = { nocallback nofree nosync nounwind willreturn memory(inaccessiblemem: readwrite) }
;.
; CHECK: [[META0]] = !{[[META1:![0-9]+]]}
; CHECK: [[META1]] = distinct !{[[META1]], [[META2:![0-9]+]], !"scope1"}
; CHECK: [[META2]] = distinct !{[[META2]], !"domain"}
; CHECK: [[META3]] = !{[[META4:![0-9]+]]}
; CHECK: [[META4]] = distinct !{[[META4]], [[META2]], !"scope2"}
; CHECK: [[META5]] = !{[[META6:![0-9]+]]}
; CHECK: [[META6]] = distinct !{[[META6]], [[META2]], !"scope2:thread"}
; CHECK: [[META7]] = !{[[META8:![0-9]+]]}
; CHECK: [[META8]] = distinct !{[[META8]], [[META2]], !"scope1:thread"}
;.