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opt -memcpyopt crashing with Assertion `isa<X>(Val) && "cast<Ty>() argument of incompatible type!"' failed. #47419

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mikaelholmen opened this issue Nov 4, 2020 · 2 comments
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opt -memcpyopt crashing with Assertion `isa<X>(Val) && "cast<Ty>() argument of incompatible type!"' failed. #47419

mikaelholmen opened this issue Nov 4, 2020 · 2 comments
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@mikaelholmen
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Bugzilla Link 48075
Resolution FIXED
Resolved on Nov 23, 2020 06:18
Version trunk
OS Linux
Attachments bbi-48944.ll reproducer
CC @rotateright
Fixed by commit(s) c5a4d80

Extended Description

Reproduce with:
opt -S -o - bbi-48944.ll -memcpyopt

Result:
opt: ../include/llvm/Support/Casting.h:269: typename cast_retty<X, Y *>::ret_type llvm::cast(Y *) [X = llvm::PointerType, Y = llvm::Type]: Assertion `isa(Val) && "cast() argument of incompatible type!"' failed.

This seems to be rather old, I've reproduced it with saved builds from July 2019.
@rotateright
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I'm not sure if there's some enhancement potential in here, but this should prevent the crashing at least by dyn_casting instead of plain casting:
https://reviews.llvm.org/rGc5a4d80fd47c

@mikaelholmen
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Thanks!

@llvmbot llvmbot transferred this issue from llvm/llvm-bugzilla-archive Dec 10, 2021
This issue was closed.
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@rotateright @mikaelholmen