Split large memory accesses in stack alloc #741
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opam strikes back. You used a feature (symmetry of disequality) that is not available before Coq 8.18 (cf. coq/coq#17025), and opam tests 8.16. The stupid fix is to call a lemma instead of symmetry, but maybe it is time to increase the lowest supported version to 8.18? |
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I will use the lemma, thanks! |
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When stack allocation replaces
x = eby[rsp + off] = e, the offset may be too large. I introduced a check at everyCopnthat splits this memory access into several instructions in ARM. I also added a warning. Note that whenxis an array set, this can be fixed manually withreg ptrs, but if it's a variable there's no way of doing so (but this scenario is probably far-fetched).