derek.holloway
7502bf64a4
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79 lines
4.2 KiB
LLVM
79 lines
4.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py
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; RUN: opt -disable-output "-passes=print<scalar-evolution>" < %s 2>&1 | FileCheck %s
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; This tests an invalidation issue during BECount calculation. %ptr1.dummy has
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; the same SCEV as %ptr1.next, but we should not remove a symbolic name
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; placeholder for %ptr1.next when invalidating SCEVs after BECount calculation.
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define void @test(ptr %arg) {
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; CHECK-LABEL: 'test'
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; CHECK-NEXT: Classifying expressions for: @test
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; CHECK-NEXT: %ptr1 = phi ptr [ %ptr1.next, %loop.latch ], [ null, %entry ]
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; CHECK-NEXT: --> %ptr1 U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %loop.header: Variant, %loop2.header: Invariant }
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; CHECK-NEXT: %ptr2 = phi ptr [ %ptr2.next, %loop.latch ], [ null, %entry ]
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; CHECK-NEXT: --> %ptr2 U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %loop.header: Variant, %loop2.header: Invariant }
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; CHECK-NEXT: %ptr1.next = phi ptr [ %ptr2, %loop.header ], [ %ptr1.next.next, %loop2.latch ]
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; CHECK-NEXT: --> {%ptr2,+,8}<nuw><%loop2.header> U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %loop2.header: Computable, %loop.header: Variant }
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; CHECK-NEXT: %iv = phi i64 [ 0, %loop.header ], [ %iv.next, %loop2.latch ]
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; CHECK-NEXT: --> {0,+,1}<nuw><nsw><%loop2.header> U: [0,1) S: [0,1) Exits: <<Unknown>> LoopDispositions: { %loop2.header: Computable, %loop.header: Uniform }
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; CHECK-NEXT: %ptr1.dummy = getelementptr inbounds i64, ptr %ptr1.next, i64 0
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; CHECK-NEXT: --> {%ptr2,+,8}<nuw><%loop2.header> U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %loop2.header: Computable, %loop.header: Variant }
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; CHECK-NEXT: %val = load i64, ptr %ptr1.dummy, align 8
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; CHECK-NEXT: --> %val U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %loop2.header: Variant, %loop.header: Variant }
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; CHECK-NEXT: %ptr1.next.next = getelementptr inbounds i64, ptr %ptr1.next, i64 1
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; CHECK-NEXT: --> {(8 + %ptr2),+,8}<nw><%loop2.header> U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %loop2.header: Computable, %loop.header: Variant }
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; CHECK-NEXT: %iv.next = add i64 %iv, 1
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; CHECK-NEXT: --> {1,+,1}<nuw><nsw><%loop2.header> U: [1,2) S: [1,2) Exits: <<Unknown>> LoopDispositions: { %loop2.header: Computable, %loop.header: Uniform }
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; CHECK-NEXT: %ptr2.next = phi ptr [ %ptr1, %if ], [ %arg, %else ]
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; CHECK-NEXT: --> %ptr2.next U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %loop.header: Variant, %loop2.header: Invariant }
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; CHECK-NEXT: Determining loop execution counts for: @test
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; CHECK-NEXT: Loop %loop2.header: <multiple exits> Unpredictable backedge-taken count.
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; CHECK-NEXT: exit count for loop2.header: ***COULDNOTCOMPUTE***
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; CHECK-NEXT: exit count for loop2.latch: i1 false
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; CHECK-NEXT: Loop %loop2.header: constant max backedge-taken count is i1 false
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; CHECK-NEXT: Loop %loop2.header: symbolic max backedge-taken count is i1 false
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; CHECK-NEXT: symbolic max exit count for loop2.header: ***COULDNOTCOMPUTE***
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; CHECK-NEXT: symbolic max exit count for loop2.latch: i1 false
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; CHECK-NEXT: Loop %loop.header: Unpredictable backedge-taken count.
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; CHECK-NEXT: Loop %loop.header: Unpredictable constant max backedge-taken count.
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; CHECK-NEXT: Loop %loop.header: Unpredictable symbolic max backedge-taken count.
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;
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entry:
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br label %loop.header
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loop.header:
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%ptr1 = phi ptr [ %ptr1.next, %loop.latch ], [ null, %entry ]
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%ptr2 = phi ptr [ %ptr2.next, %loop.latch ], [ null, %entry ]
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br label %loop2.header
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loop2.header:
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%ptr1.next = phi ptr [ %ptr2, %loop.header ], [ %ptr1.next.next, %loop2.latch ]
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%iv = phi i64 [ 0, %loop.header ], [ %iv.next, %loop2.latch ]
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%ptr1.dummy = getelementptr inbounds i64, ptr %ptr1.next, i64 0
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%val = load i64, ptr %ptr1.dummy, align 8
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%cmp = icmp ne i64 %val, 0
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br i1 %cmp, label %loop2.exit, label %loop2.latch
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loop2.latch:
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%ptr1.next.next = getelementptr inbounds i64, ptr %ptr1.next, i64 1
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%iv.next = add i64 %iv, 1
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br i1 true, label %return, label %loop2.header
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loop2.exit:
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%cmp2 = icmp sgt i64 %iv, 0
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br i1 %cmp2, label %if, label %else
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if:
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br label %loop.latch
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else:
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br label %loop.latch
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loop.latch:
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%ptr2.next = phi ptr [ %ptr1, %if ], [ %arg, %else ]
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br label %loop.header
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return:
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ret void
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}
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