[all-commits] [llvm/llvm-project] 63ecd2: Disable FTZ/DAZ when compiling shared libraries by...

[Joshua Cranmer via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 63ecd2a72523fa591aacf54d310478aabcd30d08
      https://github.com/llvm/llvm-project/commit/63ecd2a72523fa591aacf54d310478aabcd30d08
  Author: Joshua Cranmer <joshua.cranmer at intel.com>
  Date:   2024-04-25 (Thu, 25 Apr 2024)

  Changed paths:
    M clang/docs/ReleaseNotes.rst
    M clang/docs/UsersManual.rst
    M clang/include/clang/Driver/Options.td
    M clang/lib/Driver/ToolChain.cpp
    M clang/lib/Driver/ToolChains/Linux.cpp
    M clang/lib/Driver/ToolChains/Linux.h
    M clang/test/Driver/default-denormal-fp-math.c
    M clang/test/Driver/linux-ld.c

  Log Message:
  -----------
  Disable FTZ/DAZ when compiling shared libraries by default. (#80475)

This fixes https://github.com/llvm/llvm-project/issues/57589, and aligns
Clang with the behavior of current versions of gcc. There is a new
option, -mdaz-ftz, to control the linking of the file that sets FTZ/DAZ
on startup, and this flag is on by default if -ffast-math is present and
-shared isn't.

This also partially reverts fa7cd549d60 in that it disables the attempt
to set the IR denormal-fp-math attribute based on whether or not
-ffast-math is applied as it is insufficiently reliable.



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