derek.holloway
7502bf64a4
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26 lines
998 B
LLVM
26 lines
998 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
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; RUN: llc -mtriple=x86_64-unknown-linux-gnu < %s | FileCheck %s
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;
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; This test case is reduced from RangeConstraintManager.cpp in a ASan build.
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; It crashes reduceLoadWidth in DAGCombiner.cpp. Preservation of range
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; metadata must ensure that ConstantRange truncation is strictly smaller.
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define i8 @narrow_load_metadata(ptr %valptr) {
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; CHECK-LABEL: narrow_load_metadata:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: movzbl (%rdi), %eax
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; CHECK-NEXT: movb %al, 4(%rdi)
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; CHECK-NEXT: movl $0, (%rdi)
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; CHECK-NEXT: retq
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entry:
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%val = load i8, ptr %valptr, align 4, !range !0, !noundef !1
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%retval.sroa.1.0.insert.ext.i = zext i8 %val to i64
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%retval.sroa.1.0.insert.shift.i = shl i64 %retval.sroa.1.0.insert.ext.i, 32
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%coerce.val.ii = trunc i64 %retval.sroa.1.0.insert.shift.i to i40
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store i40 %coerce.val.ii, ptr %valptr, align 4
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ret i8 %val
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}
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!0 = !{i8 0, i8 2}
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!1 = !{}
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