On Sun, 01 May 2011 22:31:42 +0200, Kevin Kofler wrote: > Yes, all the packages which have WORKING support for SSE etc. in Fedora do > that. See e.g. > https://projects.kde.org/projects/kde/kdelibs/repository/revisions/master/entry/solid/solid/backends/shared/cpufeatures.cpp > https://projects.kde.org/projects/kde/kdelibs/repository/revisions/master/entry/solid/solid/backends/udev/cpuinfo.cpp > https://projects.kde.org/projects/kde/kdelibs/repository/revisions/master/entry/solid/solid/backends/udev/udevprocessor.cpp > for the implementation Solid (in kdelibs) uses. There is the STT_GNU_IFUNC feature implemented for it - the indirect is handled by linker without an additional indirect overhead if applied for a shared library function. For apps it works in a similar way as normal indirect. In use by glibc: include/libc-symbols.h: /* Marker used for indirection function symbols. */ #define libc_ifunc(name, expr) \ extern void *name##_ifunc (void) __asm__ (#name); \ void *name##_ifunc (void) \ { \ INIT_ARCH (); \ __typeof (name) *res = expr; \ return res; \ } \ __asm__ (".type " #name ", %gnu_indirect_function"); sysdeps/x86_64/multiarch/memmove.c: libc_ifunc (memmove, HAS_SSSE3 ? (HAS_FAST_COPY_BACKWARD ? __memmove_ssse3_back : __memmove_ssse3) : __memmove_sse2); etc. Or a simpler testcase: http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.base/gnu-ifunc-lib.c?rev=1.1&cvsroot=src Regards, Jan -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel
