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[PATCHv2] PowerPC: Use __builtin_ppc_get_timebase when building with GCC >= 4.8
- From: "Tulio Magno Quites Machado Filho" <tuliom at linux dot vnet dot ibm dot com>
- To: libc-alpha at sourceware dot org
- Cc: schwab at linux-m68k dot org, ryan dot arnold at gmail dot com
- Date: Wed, 31 Oct 2012 14:49:43 -0200
- Subject: [PATCHv2] PowerPC: Use __builtin_ppc_get_timebase when building with GCC >= 4.8
- References: <m28vanpxhu.fsf@igel.home>
Thanks, Andreas!
8<-------
Adapts __ppc_get_timebase to the upcoming GCC 4.8 that provides
__builtin_ppc_get_timebase.
Building glibc with previous versions of GCC will continue to use the
internal implementation.
2012-10-31 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.
---
sysdeps/powerpc/sys/platform/ppc.h | 11 ++++++++---
1 files changed, 8 insertions(+), 3 deletions(-)
diff --git a/sysdeps/powerpc/sys/platform/ppc.h b/sysdeps/powerpc/sys/platform/ppc.h
index 3780f57..58948e8 100644
--- a/sysdeps/powerpc/sys/platform/ppc.h
+++ b/sysdeps/powerpc/sys/platform/ppc.h
@@ -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 */
--
1.7.7.6