[PATCH] D33653: [Polly] Iterate over explicit instruction list in CodeGen for block statements. NFC

[Michael Kruse via Phabricator via llvm-commits]

Meinersbur added a comment.

In https://reviews.llvm.org/D33653#769688, @nandini12396 wrote:

> For the same input file, whose IR contains intrinsics, I tried generating IR again, but it did not contain intrinsics. Is there some flag required for generating intrinsics?


The ignored intrinsics are never generated. That's not the problem we see here.

The issue is that the llvm.lifetime.start gets deleted between ScopInfo and BlockGenerator. Still accessing it causes a use-after-free <https://www.owasp.org/index.php/Using_freed_memory> error.  Use Valgrind Memcheck <https://en.wikipedia.org/wiki/Valgrind> or AddressSanitizer <https://en.wikipedia.org/wiki/AddressSanitizer> to find those.


https://reviews.llvm.org/D33653