[Bug target/87139] 6.4 x86_64 incorrect code generation with -O3 around _addcarry_u64

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87139

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|                            |x86_64-*-*, i?86-*-*
          Component|c                           |target

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Can you attach the testcases?  cut&pasting has whitespace issues.

It may be an aliasing issue so try -fno-strict-aliasing.