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PowerPC: memmove default implementation cleanup

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This patch removes the powerpc specific logic in memmove and instead
include default implementation with MEMCPY_OK_FOR_FWD_MEMMOVE defined.
This lead in a increase performance, since the constraints to use
memcpy in powerpc code are too restrictive and memcpy can be used for
any forward memmove.
This commit is contained in:
Adhemerval Zanella 2014-06-24 06:42:31 -05:00
parent 3f17b03b09
commit d6f68bbef4
2 changed files with 5 additions and 97 deletions
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3
ChangeLog
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@ -1,5 +1,8 @@
2014-07-07 Adhemerval Zanella <azanella@linux.vnet.ibm.com>
* sysdeps/powerpc/memmove.c (memmove): Cleanup impplementation to use
glibc default one.
* sysdeps/powerpc/bits/link.h [_CALL_ELF]: Guard check for
__ELF_NATIVE_CLASS equal to 64.

99
sysdeps/powerpc/memmove.c
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@ -18,100 +18,5 @@
License along with the GNU C Library; see the file COPYING.LIB. If
not, see <http://www.gnu.org/licenses/>. */
#include <string.h>
#include <memcopy.h>
/* All this is so that bcopy.c can #include
this file after defining some things. */
#ifndef a1
#define a1 dest /* First arg is DEST. */
#define a1const
#define a2 src /* Second arg is SRC. */
#define a2const const
#undef memmove
#endif
#if !defined(RETURN) || !defined(rettype)
#define RETURN(s) return (s) /* Return DEST. */
#define rettype void *
#endif
#ifndef MEMMOVE
#define MEMMOVE memmove
#endif
rettype
MEMMOVE (a1, a2, len)
a1const void *a1;
a2const void *a2;
size_t len;
{
unsigned long int dstp = (long int) dest;
unsigned long int srcp = (long int) src;
/* If there is no overlap between ranges, call the builtin memcpy. */
if (dstp >= srcp + len || srcp > dstp + len)
__builtin_memcpy (dest, src, len);
/* This test makes the forward copying code be used whenever possible.
Reduces the working set. */
else if (dstp - srcp >= len) /* *Unsigned* compare! */
{
/* Copy from the beginning to the end. */
/* If there not too few bytes to copy, use word copy. */
if (len >= OP_T_THRES)
{
/* Copy just a few bytes to make DSTP aligned. */
len -= (-dstp) % OPSIZ;
BYTE_COPY_FWD (dstp, srcp, (-dstp) % OPSIZ);
/* Copy whole pages from SRCP to DSTP by virtual address
manipulation, as much as possible. */
PAGE_COPY_FWD_MAYBE (dstp, srcp, len, len);
/* Copy from SRCP to DSTP taking advantage of the known
alignment of DSTP. Number of bytes remaining is put
in the third argument, i.e. in LEN. This number may
vary from machine to machine. */
WORD_COPY_FWD (dstp, srcp, len, len);
/* Fall out and copy the tail. */
}
/* There are just a few bytes to copy. Use byte memory operations. */
BYTE_COPY_FWD (dstp, srcp, len);
}
else
{
/* Copy from the end to the beginning. */
srcp += len;
dstp += len;
/* If there not too few bytes to copy, use word copy. */
if (len >= OP_T_THRES)
{
/* Copy just a few bytes to make DSTP aligned. */
len -= dstp % OPSIZ;
BYTE_COPY_BWD (dstp, srcp, dstp % OPSIZ);
/* Copy from SRCP to DSTP taking advantage of the known
alignment of DSTP. Number of bytes remaining is put
in the third argument, i.e. in LEN. This number may
vary from machine to machine. */
WORD_COPY_BWD (dstp, srcp, len, len);
/* Fall out and copy the tail. */
}
/* There are just a few bytes to copy. Use byte memory operations. */
BYTE_COPY_BWD (dstp, srcp, len);
}
RETURN (dest);
}
#ifndef memmove
libc_hidden_builtin_def (memmove)
#endif
#define MEMCPY_OK_FOR_FWD_MEMMOVE 1
#include <string/memmove.c>