[PATCH] D122963: [X86] Extend the integer parameter if the function isn't local linked

Tue Apr 19 19:19:19 PDT 2022

LiuChen3 added a comment.

According to our internal tests, the performance of most of the tests is not affected. The most affected test performance dropped by %0.76. Average performance dropped 0.25%. This matches our expectations

It would be great if it could be fixed on the front end but now no one does. The compromise is to do workaround in the backend. I will fix it after the front end solves this issue.

There is a discussion about sign/zero extend parameter years ago: https://groups.google.com/g/x86-64-abi/c/E8O33onbnGQ. Obviously psABI does not guarantee parameter has been sign/zero extended.

Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D122963/new/

https://reviews.llvm.org/D122963