| Message ID | e2947ed2-5f8b-5bac-13bf-95addbbd9633@suse.cz |
|---|---|
| State | New |
| Headers | show |
| Series | doc: mention -mprefer-vector-width in target attrs | expand |
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
On 2/3/21 8:15 AM, Martin Liška wrote: > The patch documents -mprefer-vector-width which is a valid target > attribute/pragma. > > Ready for master? > Thanks, > Martin > > gcc/ChangeLog: > > * doc/extend.texi: Mention -mprefer-vector-width in target > attributes. > > gcc/testsuite/ChangeLog: > > * gcc.target/i386/prefer-vector-width-attr.c: New test. OK jeff
On 2/3/21 4:34 PM, Marek Polacek wrote: > 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 > Thanks Marek for the review. Installed to master. Martin
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 +compiler to use @var{OPT}-bit vector width in instructions +instead of default on the selected platform. + +Valid @var{OPT} values are: + +@table @samp +@item none +No extra limitations applied to GCC other than defined by the selected platform. + +@item 128 +Prefer 128-bit vector width for instructions. + +@item 256 +Prefer 256-bit vector width for instructions. + +@item 512 +Prefer 512-bit vector width for instructions. +@end table + @end table On the x86, the inliner does not inline a diff --git a/gcc/testsuite/gcc.target/i386/prefer-vector-width-attr.c b/gcc/testsuite/gcc.target/i386/prefer-vector-width-attr.c new file mode 100644 index 00000000000..3929f909a44 --- /dev/null +++ b/gcc/testsuite/gcc.target/i386/prefer-vector-width-attr.c @@ -0,0 +1,11 @@ +/* { dg-do compile } */ + +#pragma GCC push_options +#pragma GCC target("prefer-vector-width=512") + +int +__attribute__((target("prefer-vector-width=none"))) +main() +{ + return 0; +}