[PATCH] D95649: [GlobalISel] Implement regbankselect for G_ASSERT_ZEXT

[Jessica Paquette via Phabricator via llvm-commits]

paquette created this revision.
paquette added reviewers: aemerson, arsenm.
Herald added subscribers: hiraditya, kristof.beyls, rovka.
paquette requested review of this revision.
Herald added a subscriber: wdng.
Herald added a project: LLVM.

This adds generic regbankselect support for G_ASSERT_ZEXT.

It inherits whatever register bank the source was given, always, on all targets.

Register bank selection traverses the blocks in a function in reverse post-order, and then traverses the instructions in each block top-down. So, I think that at the point where we run into these, the source register bank should be decided.

This also adds some AArch64-specific code which makes sure we can handle G_ASSERT_ZEXT when deciding on register banks for G_STORE, G_PHI, ... etc.


https://reviews.llvm.org/D95649

Files:
  llvm/lib/CodeGen/GlobalISel/RegBankSelect.cpp
  llvm/lib/Target/AArch64/GISel/AArch64RegisterBankInfo.cpp
  llvm/test/CodeGen/AArch64/GlobalISel/regbank-assert-zext.mir

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