On Thu, Jul 30, 2015 at 3:19 PM, Evgeny Stupachenko <evstu...@gmail.com> wrote:
> Hi All,
>
> The patch enables new attribute 'ctarget',
> The attribute force compiler to create clones of a function with the
> attribute.
>
> For example:
> __attribute__((ctarget("avx","arch=slm","arch=core-avx2","default")))
> int
> foo ()
>
> will create 3 clones of foo() optimized for corresponding targets and
> replace all foo() calls with ifunc resolver.
> The patch include new tests for the feature.
>
> Currently default ctarget means that foo() will be optimized with
> current compiler options and target.
> The other option is to switch target to target specific minimum (like
> target x86-64). Is it better?
>
> What do you think about attribute name? 'ctarget' is short but not
> informative. Other variants are 'target_clones', 'targets'...
How does this interacts with Function Multiversioning
(https://gcc.gnu.org/onlinedocs/gcc-5.2.0/gcc/Function-Multiversioning.html)?
Thanks,
Andrew Pinski
>
> Below is ChangeLog. Attached patch passed make check on x86.
>
> Thanks,
> Evgeny
>
> 2015-07-31 Evgeny Stupachenko <evstu...@gmail.com>
>
> gcc/
> * Makefile.in (OBJS): Add multiple_target.o.
> * multiple_target.c (make_attribute): New.
> (create_dispatcher_calls): Ditto.
> (expand_target_clones): Ditto.
> (ipa_target_clone): Ditto.
> * passes.def (pass_target_clone): New ipa pass.
> * tree-pass.h (make_pass_target_clone): Ditto.
>
> gcc/c-family
> * c-common.c (handle_ctarget_attribute): New.
> * (c_common_attribute_table): Add handle_ctarget_attribute.
> * (handle_always_inline_attribute): Add check on ctarget attribute.
> * (handle_target_attribute): Ditto.
>
> gcc/testsuite
> * gcc.dg/mvc1.c: New test for multiple targets cloning.
> * gcc.dg/mvc2.c: Ditto.
> * gcc.dg/mvc3.c: Ditto.
> * gcc.dg/mvc4.c: Ditto.
> * gcc.dg/mvc5.c: Ditto.
> * gcc.dg/mvc6.c: Ditto.
> * gcc.dg/mvc7.c: Ditto.
> * g++.dg/ext/mvc1.C: Ditto.
> * g++.dg/ext/mvc2.C: Ditto.
> * g++.dg/ext/mvc3.C: Ditto.
