[PATCH] D75670: [FPEnv] Intrinsic llvm.roundeven

[Serge Pavlov via Phabricator via llvm-commits]

sepavloff added a comment.

Replacement of `llvm.nearbyint` and `llvm.rint` with `llvm.roundeven` in the case of default FP environment is an optimization. If it is not done, these intrinsics will be converted into runtime library calls and the semantics expected by user will not be broken. While `pragma STDC FENV_ACCESS` is not fully supported, compiler should not do such optimization, because it would made functions `nearbyint*` and `rint*` unavailable.

This patch only introduces new intrinsic function that will be used to implement functions `roundeven*` defined in new C standard.


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D75670/new/

https://reviews.llvm.org/D75670