On Wed, Feb 03, 2021 at 04:15:24PM +0100, Martin Liška wrote: > The patch documents -mprefer-vector-width which is a valid target > attribute/pragma.
> diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi > index 8daa1c67974..a14875cec37 100644 > --- a/gcc/doc/extend.texi > +++ b/gcc/doc/extend.texi > @@ -7020,6 +7020,28 @@ On x86 targets, the @code{fentry_section} attribute > sets the name > of the section to record function entry instrumentation calls in when > enabled with @option{-pg -mrecord-mcount} > +@item prefer-vector-width=@var{OPT} > +@cindex @code{prefer-vector-width} function attribute, x86 > +On x86 targets, the @code{prefer-vector-width} attribute inform the "informs" > +compiler to use @var{OPT}-bit vector width in instructions > +instead of default on the selected platform. "the default" Marek