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'...
Below is ChangeLog. Attached patch passed make check on x86.
Thanks,
Evgeny
2015-07-31 Evgeny Stupachenko <evstupac@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.