[PATCH] PowerPC - Add a faster way to read the Time Base register

[Ryan S. Arnold]

On Wed, May 30, 2012 at 9:09 AM, Tulio Magno Quites Machado Filho
<tuliom@linux.vnet.ibm.com> wrote:
> Add function __ppc_get_timebase() to directly read the Time Base register.
> This is required for applications that measure time at high frequencies
> with high precision that can't afford a syscall.
>
> 2012-05-11 Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com>
>
>        [BZ #13743]
>        * sysdeps/powerpc/sys/platform/ppc.h: New file for PowerPC features.
>        * sysdeps/powerpc/Makefile (tests): Add test-gettimebase.
>        (sysdep_headers): Include sys/platform/ppc.h.
>        * sysdeps/powerpc/test-gettimebase.c: Test for
>        __ppc_get_timebase() to catch future ISA opcode/insn changes.
>        * manual/Makefile (appendices): Include platform.texi.
>        * manual/contrib.texi (Contributors): Update @node pointers.
>        * manual/maint.texi (Maintenance): Likewise.
>        (Platform): New node.
>        * manual/platform.texi: New file.  Document the new features.


Per Roland's previous approval and Carlos O'Donnel's blessing this has
been pushed upstream for the GLIBC 2.16 release with git commit
d9dc34cd569bcfe714fe8c708e58c028106e8b2e