On Wed, 13 Sep 2017, Martin Jambor wrote:
> I was just surprised by the glibc check, what would you consider a
> recent-enough glibc? Or is the check mainly necessary to ensure we
> are indeed using glibc and not some other libc (and thus something
> like we do for TARGET_LIBC_PROVIDES_SSP would do)?
It looks like SSE4.1 {ceil,floor,rint}{,f} were added in glibc commit
ad0f5cad15f1c76faf3843b3e189dead2c05cfcc, nearbyint{,f} in
581d30e386b9567b973a65d0bc82af782ac078ed, so 2.15 or later for all those
functions (the target glibc version is known when GCC is configured,
whether from configure examining headers or from --with-glibc-version).
glibc does not have SSE4.1 {trunc,roundeven}{,f} at present (missing trunc
is <https://sourceware.org/bugzilla/show_bug.cgi?id=20142>).
--
Joseph S. Myers
jos...@codesourcery.com
