103 lines
3.7 KiB
LLVM
103 lines
3.7 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py UTC_ARGS: --version 4
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; RUN: opt -passes='print<access-info>' -disable-output 2>&1 < %s | FileCheck %s
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; PR79137: If the noalias.scope.decl is located inside the loop, we cannot
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; assume that the accesses don't alias across iterations.
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define void @test_scope_in_loop(ptr %arg, i64 %num) {
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; CHECK-LABEL: 'test_scope_in_loop'
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; CHECK-NEXT: loop:
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; CHECK-NEXT: Report: unsafe dependent memory operations in loop. Use #pragma clang loop distribute(enable) to allow loop distribution to attempt to isolate the offending operations into a separate loop
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; CHECK-NEXT: Backward loop carried data dependence.
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; CHECK-NEXT: Dependences:
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; CHECK-NEXT: Backward:
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; CHECK-NEXT: %load.prev = load i8, ptr %prev.ptr, align 1, !alias.scope !0, !noalias !3 ->
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; CHECK-NEXT: store i8 %add, ptr %cur.ptr, align 1, !alias.scope !3
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; CHECK-EMPTY:
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; CHECK-NEXT: Forward:
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; CHECK-NEXT: %load.cur = load i8, ptr %cur.ptr, align 1, !alias.scope !3 ->
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; CHECK-NEXT: store i8 %add, ptr %cur.ptr, align 1, !alias.scope !3
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; CHECK-EMPTY:
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; CHECK-NEXT: Run-time memory checks:
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; CHECK-NEXT: Grouped accesses:
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; CHECK-EMPTY:
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; CHECK-NEXT: Non vectorizable stores to invariant address were not found in loop.
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; CHECK-NEXT: SCEV assumptions:
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; CHECK-EMPTY:
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; CHECK-NEXT: Expressions re-written:
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;
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entry:
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%icmp = icmp ult i64 %num, 2
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br i1 %icmp, label %exit, label %preheader
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preheader:
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%arg.1 = getelementptr inbounds i8, ptr %arg, i64 1
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%end = add i64 %num, -2
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br label %loop
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loop:
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%prev.ptr = phi ptr [ %cur.ptr, %loop ], [ %arg, %preheader ]
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%iv = phi i64 [ %iv.next, %loop ], [ 0, %preheader ]
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%cur.ptr = getelementptr inbounds i8, ptr %arg.1, i64 %iv
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call void @llvm.experimental.noalias.scope.decl(metadata !0)
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call void @llvm.experimental.noalias.scope.decl(metadata !3)
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%load.prev = load i8, ptr %prev.ptr, align 1, !alias.scope !0, !noalias !3
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%load.cur = load i8, ptr %cur.ptr, align 1, !alias.scope !3
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%add = add i8 %load.cur, %load.prev
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store i8 %add, ptr %cur.ptr, align 1, !alias.scope !3
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%iv.next = add nuw i64 %iv, 1
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%cmp = icmp eq i64 %iv, %end
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br i1 %cmp, label %exit, label %loop
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exit:
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ret void
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}
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define void @test_scope_out_of_loop(ptr %arg, i64 %num) {
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; CHECK-LABEL: 'test_scope_out_of_loop'
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; CHECK-NEXT: loop:
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; CHECK-NEXT: Memory dependences are safe
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; CHECK-NEXT: Dependences:
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; CHECK-NEXT: Run-time memory checks:
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; CHECK-NEXT: Grouped accesses:
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; CHECK-EMPTY:
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; CHECK-NEXT: Non vectorizable stores to invariant address were not found in loop.
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; CHECK-NEXT: SCEV assumptions:
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; CHECK-EMPTY:
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; CHECK-NEXT: Expressions re-written:
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;
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entry:
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%icmp = icmp ult i64 %num, 2
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br i1 %icmp, label %exit, label %preheader
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preheader:
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call void @llvm.experimental.noalias.scope.decl(metadata !0)
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call void @llvm.experimental.noalias.scope.decl(metadata !3)
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%arg.1 = getelementptr inbounds i8, ptr %arg, i64 1
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%end = add i64 %num, -2
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br label %loop
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loop:
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%prev.ptr = phi ptr [ %cur.ptr, %loop ], [ %arg, %preheader ]
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%iv = phi i64 [ %iv.next, %loop ], [ 0, %preheader ]
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%cur.ptr = getelementptr inbounds i8, ptr %arg.1, i64 %iv
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%load.prev = load i8, ptr %prev.ptr, align 1, !alias.scope !0, !noalias !3
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%load.cur = load i8, ptr %cur.ptr, align 1, !alias.scope !3
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%add = add i8 %load.cur, %load.prev
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store i8 %add, ptr %cur.ptr, align 1, !alias.scope !3
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%iv.next = add nuw i64 %iv, 1
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%cmp = icmp eq i64 %iv, %end
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br i1 %cmp, label %exit, label %loop
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exit:
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ret void
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}
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declare void @llvm.experimental.noalias.scope.decl(metadata)
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!0 = !{!1}
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!1 = distinct !{!1, !2}
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!2 = distinct !{!2}
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!3 = !{!4}
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!4 = distinct !{!4, !5}
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!5 = distinct !{!5}
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