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S390: Ifunc resolver macro for vector instructions.

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This patch introduces a s390 specific ifunc resolver macro for 32/64bit,
which chooses <func>_vx with vector instructions if HWCAP_S390_VX flag
in hwcaps is set or <func>_c if not.

ChangeLog:

	* sysdeps/s390/multiarch/ifunc-resolve.h (s390_vx_libc_ifunc,
	s390_vx_libc_ifunc2): New macro function.
This commit is contained in:
Stefan Liebler
2015-08-26 10:26:19 +02:00
committed by Andreas Krebbel
parent 4f0a1cea34
commit fd484e057d
2 changed files with 24 additions and 0 deletions
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19
sysdeps/s390/multiarch/ifunc-resolve.h
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@@ -73,3 +73,22 @@
else \
return &__##FUNC##_default; \
}
#define s390_vx_libc_ifunc(FUNC) \
s390_vx_libc_ifunc2(FUNC, FUNC)
#define s390_vx_libc_ifunc2(RESOLVERFUNC, FUNC) \
/* Make the declarations of the optimized functions hidden in order
to prevent GOT slots being generated for them. */ \
extern __typeof (FUNC) RESOLVERFUNC##_vx attribute_hidden; \
extern __typeof (FUNC) RESOLVERFUNC##_c attribute_hidden; \
extern void *__resolve_##RESOLVERFUNC (unsigned long int) __asm__ (#FUNC); \
\
void *__resolve_##RESOLVERFUNC (unsigned long int dl_hwcap) \
{ \
if (dl_hwcap & HWCAP_S390_VX) \
return &RESOLVERFUNC##_vx; \
else \
return &RESOLVERFUNC##_c; \
} \
__asm__ (".type " #FUNC ", %gnu_indirect_function");