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Direct __ppc_get_timebase to __builtin_ppc_get_timebase for GCC 4.8+.

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Adapts __ppc_get_timebase to the upcoming GCC 4.8 that provides
__builtin_ppc_get_timebase.  Building applicationns with previous
versions of GCC will continue to use the internal implementation.
This commit is contained in:
Tulio Magno Quites Machado Filho 2012-11-02 11:20:39 -05:00 committed by Ryan S. Arnold
parent dcdae19a3f
commit d7d08bdede
2 changed files with 14 additions and 3 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2012-11-02 Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com>
* sysdeps/powerpc/sys/platform/ppc.h (__ppc_get_timebase): Use
__builtin_ppc_get_timebase when building with GCC >= 4.8 instead
of the internal implementation.
2012-11-02 Joseph Myers <joseph@codesourcery.com>
* include/sys/syslog.h [_ISOMAC]: Disable all contents of file

11
sysdeps/powerpc/sys/platform/ppc.h
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@ -19,6 +19,7 @@
#ifndef _SYS_PLATFORM_PPC_H
#define _SYS_PLATFORM_PPC_H 1
#include <features.h>
#include <stdint.h>
#include <bits/ppc.h>
@ -26,13 +27,16 @@
static inline uint64_t
__ppc_get_timebase (void)
{
#ifdef __powerpc64__
#if __GNUC_PREREQ (4, 8)
return __builtin_ppc_get_timebase ();
#else
# ifdef __powerpc64__
uint64_t __tb;
/* "volatile" is necessary here, because the user expects this assembly
isn't moved after an optimization. */
__asm__ volatile ("mfspr %0, 268" : "=r" (__tb));
return __tb;
#else /* not __powerpc64__ */
# else /* not __powerpc64__ */
uint32_t __tbu, __tbl, __tmp; \
__asm__ volatile ("0:\n\t"
"mftbu %0\n\t"
@ -42,7 +46,8 @@ __ppc_get_timebase (void)
"bne- 0b"
: "=r" (__tbu), "=r" (__tbl), "=r" (__tmp));
return (((uint64_t) __tbu << 32) | __tbl);
#endif /* not __powerpc64__ */
# endif /* not __powerpc64__ */
#endif
}
#endif /* sys/platform/ppc.h */