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

[Jonas Paulsson via Phabricator via llvm-commits]

jonpa updated this revision to Diff 148406.
jonpa added a comment.

Patch updated per previous discussion.

- New static method computeCalleeSavedRegs() that does the work of adding subregs and fully saved superregs, that we can reuse in e.g. MachineVerifier.

- When encountering a def of a reg, only call SetRegAsDefined after checking that *AI was not saved.

- There is no CoveredBySubRegs flag on the register, but only on the register class as far as I can see. Since getMinimalPhysRegClass() iterates over all register classes, I thought this method might as well do the same.


https://reviews.llvm.org/D46315

Files:
  lib/CodeGen/RegUsageInfoCollector.cpp
  test/CodeGen/SystemZ/ipra-04.ll

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