[PATCH] D89239: [RISCV][PrologEpilogInserter] "Float" emergency spill slots to avoid making them immediately unreachable from the stack pointer

[Roger Ferrer Ibanez via Phabricator via llvm-commits]

rogfer01 added a comment.

Looking into the origin of this problem, `git bisect` points at cb82de29601 <https://reviews.llvm.org/rGcb82de29601745d6c4beaf51ee1dbd1bf7acc186> but I don't think it is the culprit. Looks like we may have been a bit unlucky during register allocation with the new sequence of instructions.

After cb82de29601 <https://reviews.llvm.org/rGcb82de29601745d6c4beaf51ee1dbd1bf7acc186>, `-stop-before=prologepilog` shows we need a couple more of spill slots for RegAlloc. It is accessing to one of them what triggers the issue with the register scavenger and the emergency spill slot.


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  https://reviews.llvm.org/D89239/new/

https://reviews.llvm.org/D89239