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4634635ce4
Previously, we would hit UB (or the ISD::DELETED_NODE assert) if we happened to replace a node during UpdateChains, because it would be left in the list we were iterating over. This nulls out the pointer when that happens so that we can avoid the issue. Fixes llvm.org/PR31710 llvm-svn: 293522
40 lines
1.4 KiB
LLVM
40 lines
1.4 KiB
LLVM
; RUN: llc < %s -mtriple=s390x-redhat-linux | FileCheck %s
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;
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; Triggers a path in SelectionDAG's UpdateChains where a node is
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; deleted but we try to read it later (pr31710), invoking UB in
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; release mode or hitting an assert if they're enabled.
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; CHECK: btldata:
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define void @btldata(i64* %u0, i32** %p0, i32** %p1, i32** %p3, i32** %p5, i32** %p7) {
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entry:
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%x0 = load i32*, i32** %p0, align 8, !tbaa !0
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store i64 0, i64* %u0, align 8, !tbaa !4
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%x1 = load i32*, i32** %p1, align 8, !tbaa !0
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%x2 = load i32, i32* %x1, align 4, !tbaa !6
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%x2ext = sext i32 %x2 to i64
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store i32 %x2, i32* %x1, align 4, !tbaa !6
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%x3 = load i32*, i32** %p3, align 8, !tbaa !0
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%ptr = getelementptr inbounds i32, i32* %x3, i64 %x2ext
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%x4 = load i32, i32* %ptr, align 4, !tbaa !6
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%x4inc = add nsw i32 %x4, 1
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store i32 %x4inc, i32* %ptr, align 4, !tbaa !6
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store i64 undef, i64* %u0, align 8, !tbaa !4
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%x5 = load i32*, i32** %p5, align 8, !tbaa !0
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%x6 = load i32, i32* %x5, align 4, !tbaa !6
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store i32 %x6, i32* %x5, align 4, !tbaa !6
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%x7 = load i32*, i32** %p7, align 8, !tbaa !0
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%x8 = load i32, i32* %x7, align 4, !tbaa !6
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%x8inc = add nsw i32 %x8, 1
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store i32 %x8inc, i32* %x7, align 4, !tbaa !6
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ret void
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}
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!0 = !{!1, !1, i64 0}
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!1 = !{!"any pointer", !2, i64 0}
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!2 = !{!"omnipotent char", !3, i64 0}
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!3 = !{!"Simple C/C++ TBAA"}
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!4 = !{!5, !5, i64 0}
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!5 = !{!"long", !2, i64 0}
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!6 = !{!7, !7, i64 0}
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!7 = !{!"int", !2, i64 0}
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