I'm still trying to create a reduced test case for the bug introduced by https://github.com/llvm/llvm-project/pull/129889. It's not going to be easy. But I did find an easy way for Mozilla to work around this bug: Just add `-mllvm -aarch64-enable-copy-propagation=false` to `CPPFLAGS`. Note that this flag has no effect unless you're using `-O3` optimization, and that the crashes don't happen at lower levels of optimization (or with no optimization).
Bug 1995582 Comment 21 Edit History
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I'm still trying to create a reduced test case for the LLVM 21 bug introduced by https://github.com/llvm/llvm-project/pull/129889. It's not going to be easy. But I did find an easy way for Mozilla to work around this bug: Just add `-mllvm -aarch64-enable-copy-propagation=false` to `CPPFLAGS`. Note that this flag has no effect unless you're using `-O3` optimization, and that the crashes don't happen at lower levels of optimization (or with no optimization).