diff options
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/generic/ifunc-init.h | 54 | ||||
| -rw-r--r-- | sysdeps/x86/init-arch.h | 41 |
2 files changed, 55 insertions, 40 deletions
diff --git a/sysdeps/generic/ifunc-init.h b/sysdeps/generic/ifunc-init.h new file mode 100644 index 0000000000..59d5ac6c1c --- /dev/null +++ b/sysdeps/generic/ifunc-init.h @@ -0,0 +1,54 @@ +/* IFUNC generic definitions. + This file is part of the GNU C Library. + Copyright (C) 2017 Free Software Foundation, Inc. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +/* These macros are used to implement ifunc selection in C. To implement + an ifunc function, foo, which returns the address of __foo_impl1 or + __foo_impl2: + + #define foo __redirect_foo + #include <foo.h> + #undef foo + #define SYMBOL_NAME foo + #include <ifunc-init.h> + + extern __typeof (REDIRECT_NAME) OPTIMIZE (impl1) attribute_hidden; + extern __typeof (REDIRECT_NAME) OPTIMIZE (impl2) attribute_hidden; + + static inline void * + foo_selector (void) + { + if (condition) + return OPTIMIZE (impl2); + + return OPTIMIZE (impl1); + } + + libc_ifunc_redirected (__redirect_foo, foo, IFUNC_SELECTOR ()); +*/ + +#define PASTER1(x,y) x##_##y +#define EVALUATOR1(x,y) PASTER1 (x,y) +#define PASTER2(x,y) __##x##_##y +#define EVALUATOR2(x,y) PASTER2 (x,y) + +/* Basically set '__redirect_<symbol>' to use as type definition, + '__<symbol>_<variant>' as the optimized implementation and + '<symbol>_ifunc_selector' as the IFUNC selector. */ +#define REDIRECT_NAME EVALUATOR1 (__redirect, SYMBOL_NAME) +#define OPTIMIZE(name) EVALUATOR2 (SYMBOL_NAME, name) +#define IFUNC_SELECTOR EVALUATOR1 (SYMBOL_NAME, ifunc_selector) diff --git a/sysdeps/x86/init-arch.h b/sysdeps/x86/init-arch.h index 15d3f0975d..06a21cc249 100644 --- a/sysdeps/x86/init-arch.h +++ b/sysdeps/x86/init-arch.h @@ -20,46 +20,7 @@ #else # include <ldsodefs.h> #endif - -/* These macros are used to implement ifunc selection in C. To implement - an ifunc function, foo, which returns the address of __foo_sse2 or - __foo_avx2: - - #define foo __redirect_foo - #define __foo __redirect___foo - #include <foo.h> - #undef foo - #undef __foo - #define SYMBOL_NAME foo - #include <init-arch.h> - - extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2) attribute_hidden; - extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2) attribute_hidden; - - static inline void * - foo_selector (void) - { - if (use AVX2) - return OPTIMIZE (avx2); - - return OPTIMIZE (sse2); - } - - libc_ifunc_redirected (__redirect_foo, foo, foo_selector ()); - -*/ - -#define PASTER1(x,y) x##_##y -#define EVALUATOR1(x,y) PASTER1 (x,y) -#define PASTER2(x,y) __##x##_##y -#define EVALUATOR2(x,y) PASTER2 (x,y) - -/* Basically set '__redirect_<symbol>' to use as type definition, - '__<symbol>_<variant>' as the optimized implementation and - '<symbol>_ifunc_selector' as the IFUNC selector. */ -#define REDIRECT_NAME EVALUATOR1 (__redirect, SYMBOL_NAME) -#define OPTIMIZE(name) EVALUATOR2 (SYMBOL_NAME, name) -#define IFUNC_SELECTOR EVALUATOR1 (SYMBOL_NAME, ifunc_selector) +#include <ifunc-init.h> #ifndef __x86_64__ /* Due to the reordering and the other nifty extensions in i686, it is |