[all-commits] [llvm/llvm-project] 27e5f5: [Driver] Make ffp-model=fast honor non-finite-valu...

[Andy Kaylor via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 27e5f505e5eee3da27c1515d6ed95d66fbe543ea
      https://github.com/llvm/llvm-project/commit/27e5f505e5eee3da27c1515d6ed95d66fbe543ea
  Author: Andy Kaylor <andrew.kaylor at intel.com>
  Date:   2024-08-20 (Tue, 20 Aug 2024)

  Changed paths:
    M clang/docs/ReleaseNotes.rst
    M clang/docs/UsersManual.rst
    M clang/lib/Driver/ToolChain.cpp
    M clang/lib/Driver/ToolChains/Clang.cpp
    M clang/test/CodeGen/ffp-model.c
    M clang/test/Driver/fp-model.c

  Log Message:
  -----------
  [Driver] Make ffp-model=fast honor non-finite-values, introduce ffp-model=aggressive (#100453)

This change modifies -ffp-model=fast to select options that more closely
match -funsafe-math-optimizations, and introduces a new model,
-ffp-model=aggressive which matches the existing behavior (except for a
minor change in the fp-contract behavior).

The primary motivation for this change is to make -ffp-model=fast more
user friendly, particularly in light of LLVM's aggressive optimizations
when -fno-honor-nans and -fno-honor-infinites are used.

This was previously proposed here:

https://discourse.llvm.org/t/making-ffp-model-fast-more-user-friendly/78402



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