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626b423640
Calling `operator*` on a WeakVH with a null value yields a null reference, which is UB. Avoid this by implicitly converting the WeakVH to a `Value *` rather than dereferencing and then taking the address for the type conversion. Differential Revision: https://reviews.llvm.org/D73280
43 lines
1.1 KiB
LLVM
43 lines
1.1 KiB
LLVM
; RUN: opt -S < %s -loop-unroll -unroll-allow-partial=1 | FileCheck %s
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;
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; Bugpointed test that triggered UB while cleaning up dead
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; instructions after simplifying indvars
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; We just check that some unrolling happened here - the assert we've
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; added to ValueHandleBase::operator* would fire if the bug was still
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; present.
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; CHECK: atomicrmw volatile add i32*
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; CHECK: atomicrmw volatile add i32*
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; CHECK: atomicrmw volatile add i32*
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@global = external global i32, align 4
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define void @widget() {
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bb:
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br label %bb1
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bb1:
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br label %bb2
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bb2:
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%tmp = phi i32 [ 0, %bb1 ], [ %tmp34, %bb33 ]
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%tmp3 = phi i32 [ 0, %bb1 ], [ %tmp34, %bb33 ]
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%tmp26 = and i32 %tmp, 1073741823
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%tmp27 = getelementptr inbounds i32, i32* @global, i32 %tmp26
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%tmp28 = atomicrmw volatile add i32* %tmp27, i32 1 monotonic
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%tmp29 = icmp ugt i32 %tmp28, 23
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%tmp30 = shl i32 %tmp, 6
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%tmp31 = add i32 %tmp30, undef
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%tmp32 = add i32 %tmp31, %tmp28
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store i32 undef, i32* undef, align 4
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br label %bb33
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bb33:
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%tmp34 = add nuw nsw i32 %tmp3, 1
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%tmp35 = icmp ult i32 %tmp3, 15
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br i1 %tmp35, label %bb2, label %bb36
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bb36:
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br label %bb1
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}
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