fhahn added inline comments.
================
Comment at: clang/lib/CodeGen/CGCall.cpp:2535
ArgAttrs[FirstIRArg + i] =
llvm::AttributeSet::get(getLLVMContext(), Attrs);
}
----------------
nlopes wrote:
> ab wrote:
> > Hmm, if I'm reading this right, this overwrites the `nonnull
> > dereferenceable align` attributes separately computed for `this` around
> > l2335, right? (or `inalloca` and `sret` before that)
> >
> > It sounds like an ancient bug, that's only exposed because `noundef` ends
> > up triggering this logic much more often?
> >
> > Many of our downstream tests hit this. The hacked up patch seems to do the
> > job; ideally we'd feed the previously-computed attrs when constructing the
> > AttrBuilder (which would also fix the padding argument), but we'd need to
> > match up the IR args first. Maybe that's fine as a special-case for arg 0
> > though
> nice catch! It's an ancient bug where arg 0 is overwritten.
Is anybody looking into a fix or should we revert the patch until this can be
properly addressed?
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D105169/new/
https://reviews.llvm.org/D105169
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