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6 Commits

Author SHA1 Message Date
Adhemerval Zanella
4e17c78e4a Add common ifunc-init.h header 
This patch moves the generic definition from x86_64 init-arch
to a common header ifunc-init.h.  No functional changes is expected.

Checked on a x86_64-linux-gnu build.

	* sysdeps/generic/ifunc-init.h: New file.
	* sysdeps/x86/init-arch.h: Use generic ifunc-init.h.
 2017-10-17 12:01:22 -02:00
H.J. Lu
9cd30491dd x86: Add macros to implement ifunce selection in C 
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:

   __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 ());

	* sysdeps/x86/init-arch.h (PASTER1): New.
	(EVALUATOR1): Likewise.
	(PASTER2): Likewise.
	(EVALUATOR2): Likewise.
	(REDIRECT_NAME): Likewise.
	(OPTIMIZE): Likewise.
	(IFUNC_SELECTOR): Likewise.
 2017-06-05 08:28:13 -07:00
Joseph Myers
bfff8b1bec Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
Joseph Myers
f7a9f785e5 Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
H.J. Lu
75dd0a8f3d Detect and select i586/i686 implementation at run-time 
We detect i586 and i686 features at run-time by checking CX8 and CMOV
CPUID features bits.  We can use these information to select the best
implementation in ix86 multiarch.  HAS_I586/HAS_I686 is true if i586/i686
instructions are available on the processor.

Due to the reordering and the other nifty extensions in i686, it is not
really good to use heavily i586 optimized code on an i686.  It's better
to use i486 code if it isn't an i586.  USE_I586/USE_I686 is true if
i586/i686 implementation should be used for the processor.  USE_I586
is true only if i686 instructions aren't available.  If i686 instructions
are available, we always choose i686 or i486 implementation, in that order,
and we never choose i586 implementation for i686-class processors.

	* sysdeps/i386/init-arch.h: New file.
	* sysdeps/i386/i586/init-arch.h: Likewise.
	* sysdeps/i386/i686/init-arch.h: Likewise.
	* sysdeps/x86/cpu-features.c (init_cpu_features): Set bit_I586
	bit if CX8 is available.  Set bit_I686 bit if CMOV is available.
	* sysdeps/x86/cpu-features.h (bit_I586): New.
	(bit_I686): Likewise.
	(bit_CX8): Likewise.
	(bit_CMOV): Likewise.
	(index_CX8): Likewise.
	(index_CMOV): Likewise.
	(index_I586): Likewise.
	(index_I686): Likewise.
	(reg_CX8): Likewise.
	(reg_CMOV): Likewise.
	(HAS_I586): Defined as HAS_ARCH_FEATURE (I586) if i586 isn't
	available at compile-time.
	(HAS_I686): Defined as HAS_ARCH_FEATURE (I686) if i686 isn't
	available at compile-time.
	* sysdeps/x86/init-arch.h (USE_I586): New macro.
	(USE_I686): Likewise.
 2015-08-27 09:06:44 -07:00
H.J. Lu
1ae6c72dc1 Move x86_64 init-arch.h to sysdeps/x86/init-arch.h 
Move sysdeps/x86_64/multiarch/init-arch.h to sysdeps/x86/init-arch.h
which can be used for both i386 and x86_64.

	* sysdeps/i386/i686/multiarch/init-arch.h: Removed.
	* sysdeps/unix/sysv/linux/x86/init-arch.h: Likewise.
	* sysdeps/x86_64/cacheinfo.c: Include <init-arch.h> instead
	of "multiarch/init-arch.h".
	* sysdeps/x86_64/multiarch/init-arch.h: Renamed to ...
	* sysdeps/x86/init-arch.h: This.
 2015-08-20 04:29:23 -07:00