http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58817
--- Comment #3 from Marc Glisse <glisse at gcc dot gnu.org> --- (In reply to Jakub Jelinek from comment #1) > Transforming VLAs that way isn't a good idea, at least if the size isn't > really small, at least when the VLA isn't in a scope that dies at the > function's end (or if there is a chance the function might be inlined > because of that optimization). Because, unlike normal alloca, VLAs are > deallocated already when leading the scope they were declared in, and tons > of programs rely on that deallocation, otherwise you might have too big > stack requirements. Currently we are turning VLAs into regular arrays, but not alloca. From your explanations, I understand we should basically do the converse? (do it for alloca but not VLA)
