[PATCH] D46315: [RegUsageInfoCollector] Fix handling of callee saved registers with CSR optimization.

[Quentin Colombet via Phabricator via llvm-commits]

qcolombet added a comment.

E.g., on x86 saving xmm0 is not enough to say that ymm0 is preservered even if ymm0 doesn’t have any other sub reg.


https://reviews.llvm.org/D46315