83aa93e995
Keys matching the tombstone/empty special values cannot be inserted in a DenseMap. Under some circumstances, LV tries to add members to an interleave group that match the special values. Skip adding such members. This is unlikely to have any impact in practice, because interleave groups with such indices are very likely to not be vectorized, due to gaps. This issue has been surfaced by fuzzing, see https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=11638
101 lines
2.9 KiB
LLVM
101 lines
2.9 KiB
LLVM
; RUN: opt < %s -loop-vectorize -mtriple x86_64 -S | FileCheck %s
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%struct.ST4 = type { i32, i32, i32, i32 }
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; The gaps between the memory access in this function are too large for
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; interleaving.
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; Test from https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=7560
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define void @test1(%struct.ST4* noalias %B) {
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; CHECK-LABEL: @test1
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label %for.body
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; CHECK-LABEL: for.body:
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; CHECK: store i32
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; CHECK: store i32
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; CHECK: store i32
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; CHECK: store i32
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; CHECK-NOT: store
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;
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entry:
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br label %for.body
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for.body: ; preds = %for.body, %entry
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%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
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%p1 = getelementptr inbounds %struct.ST4, %struct.ST4* %B, i64 %indvars.iv, i32 0
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store i32 65536, i32* %p1, align 4
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%p2 = getelementptr i32, i32* %p1, i32 -2147483648
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store i32 65536, i32* %p2, align 4
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%p3 = getelementptr inbounds %struct.ST4, %struct.ST4* %B, i64 %indvars.iv, i32 2
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store i32 10, i32* %p3, align 4
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%p4 = getelementptr inbounds %struct.ST4, %struct.ST4* %B, i64 %indvars.iv, i32 3
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store i32 12, i32* %p4, align 4
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%exitcond = icmp eq i64 %indvars.iv.next, 1024
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br i1 %exitcond, label %for.cond.cleanup, label %for.body
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for.cond.cleanup: ; preds = %for.body
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ret void
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}
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; Make sure interleave groups with a key being the special 'empty' value for
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; the map do not cause a crash.
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define void @test_gap_empty_key() {
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; CHECK-LABEL: @test_gap_empty_key()
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label %for.body
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; CHECK-LABEL: for.body:
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; CHECK: store i32
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; CHECK: store i32
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; CHECK-NOT: store
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;
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entry:
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br label %for.body
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for.body:
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%iv = phi i64 [ 1, %entry ], [ %iv.next, %for.body ]
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%iv.next = add nsw i64 %iv, 1
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%arrayidx = getelementptr inbounds [3 x i32], [3 x i32]* undef, i64 0, i64 %iv.next
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%G2 = getelementptr i32, i32* %arrayidx, i64 %iv.next
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%G9 = getelementptr i32, i32* %G2, i32 -2147483647
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store i32 0, i32* %G2
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store i32 1, i32* %G9
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%cmp = icmp ule i64 %iv, 1000
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br i1 false, label %for.body, label %exit
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exit:
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ret void
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}
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; Make sure interleave groups with a key being the special 'tombstone' value for
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; the map do not cause a crash.
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define void @test_tombstone_key() {
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; CHECK-LABEL: @test_tombstone_key()
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label %for.body
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; CHECK-LABEL: for.body:
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; CHECK: store i32
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; CHECK: store i32
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; CHECK-NOT: store
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;
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entry:
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br label %for.body
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for.body:
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%iv = phi i64 [ 1, %entry ], [ %iv.next, %for.body ]
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%iv.next = add nsw i64 %iv, 1
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%arrayidx = getelementptr inbounds [3 x i32], [3 x i32]* undef, i64 0, i64 %iv.next
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%G2 = getelementptr i32, i32* %arrayidx, i64 %iv.next
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%G9 = getelementptr i32, i32* %G2, i32 -2147483648
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store i32 0, i32* %G2
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store i32 1, i32* %G9
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%cmp = icmp ule i64 %iv, 1000
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br i1 false, label %for.body, label %exit
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exit:
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ret void
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}
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