[PATCH] D90606: [llvm][AArch64] Check the sign bit of a sign extended value before sign extension.

[Francesco Petrogalli via Phabricator via llvm-commits]

fpetrogalli updated this revision to Diff 302522.
fpetrogalli added a comment.

Thank you for the review @resistor. I have implememted the
optimization also looking through a `sign_extend` node. Tests to cover
this have been added, but only for extending `i32` into `i64` because
illegal values like `i8` are always sign extended inreg.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D90606/new/

https://reviews.llvm.org/D90606

Files:
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/test/CodeGen/AArch64/check-sign-bit-before-extension.ll

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