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cshift0.c (DEF_COPY_LOOP, [...]): New.

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* intrinsics/cshift0.c (DEF_COPY_LOOP, copy_loop_int, copy_loop_long,
        copy_loop_double, copy_loop_ldouble): New.
        (__cshift0): Make shift type ssize_t.  Use % operator instead of
        div.  Use specialized versions of copy loop depending on the shape.

From-SVN: r87045
This commit is contained in:
Richard Henderson 2004-09-03 12:03:43 -07:00 committed by Richard Henderson
parent 61fec9ffac
commit 803a6ff52c
2 changed files with 92 additions and 19 deletions
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7
libgfortran/ChangeLog
View File

@ -1,3 +1,10 @@
2004-09-03 Richard Henderson <rth@redhat.com>
* intrinsics/cshift0.c (DEF_COPY_LOOP, copy_loop_int, copy_loop_long,
copy_loop_double, copy_loop_ldouble): New.
(__cshift0): Make shift type ssize_t. Use % operator instead of
div. Use specialized versions of copy loop depending on the shape.
2004-09-02 Paul Brook <paul@codesourcery.com>
* io/format.c (parse_format_list): Set repeat count for P descriptors.

104
libgfortran/intrinsics/cshift0.c
View File

@ -25,25 +25,61 @@ Boston, MA 02111-1307, USA. */
#include <string.h>
#include "libgfortran.h"
/* TODO: make this work for large shifts when
sizeof(int) < sizeof (index_type). */
/* "Templatized" helper function for the inner shift loop. */
#define DEF_COPY_LOOP(NAME, TYPE) \
static inline void \
copy_loop_##NAME (void *xdest, const void *xsrc, \
size_t roff, size_t soff, \
index_type len, index_type shift) \
{ \
TYPE *dest = xdest; \
const TYPE *src; \
index_type i; \
\
roff /= sizeof (TYPE); \
soff /= sizeof (TYPE); \
\
src = xsrc; \
src += shift * soff; \
for (i = 0; i < len - shift; ++i) \
{ \
*dest = *src; \
dest += roff; \
src += soff; \
} \
\
src = xsrc; \
for (i = 0; i < shift; ++i) \
{ \
*dest = *src; \
dest += roff; \
src += soff; \
} \
}
DEF_COPY_LOOP(int, int)
DEF_COPY_LOOP(long, long)
DEF_COPY_LOOP(double, double)
DEF_COPY_LOOP(ldouble, long double)
static void
__cshift0 (gfc_array_char * ret, const gfc_array_char * array,
int shift, int which)
ssize_t shift, int which)
{
/* r.* indicates the return array. */
index_type rstride[GFC_MAX_DIMENSIONS - 1];
index_type rstride0;
index_type roffset;
char *rptr;
char *dest;
/* s.* indicates the source array. */
index_type sstride[GFC_MAX_DIMENSIONS - 1];
index_type sstride0;
index_type soffset;
const char *sptr;
const char *src;
index_type count[GFC_MAX_DIMENSIONS - 1];
index_type extent[GFC_MAX_DIMENSIONS - 1];
@ -64,7 +100,7 @@ __cshift0 (gfc_array_char * ret, const gfc_array_char * array,
size = GFC_DESCRIPTOR_SIZE (array);
n = 0;
/* Initialized for avoiding compiler warnings. */
/* Initialized for avoiding compiler warnings. */
roffset = size;
soffset = size;
len = 0;
@ -120,24 +156,55 @@ __cshift0 (gfc_array_char * ret, const gfc_array_char * array,
rptr = ret->data;
sptr = array->data;
shift = (div (shift, len)).rem;
shift = shift % (ssize_t)len;
if (shift < 0)
shift += len;
while (rptr)
{
/* Do the shift for this dimension. */
src = &sptr[shift * soffset];
dest = rptr;
for (n = 0; n < len; n++)
{
memcpy (dest, src, size);
dest += roffset;
if (n == len - shift - 1)
src = sptr;
else
src += soffset;
}
/* If elements are contiguous, perform the operation
in two block moves. */
if (soffset == size && roffset == size)
{
size_t len1 = shift * size;
size_t len2 = (len - shift) * size;
memcpy (rptr, sptr + len1, len2);
memcpy (rptr + len2, sptr, len1);
}
else
{
/* Otherwise, we'll have to perform the copy one element at
a time. We can speed this up a tad for common cases of
fundamental types. */
if (size == sizeof(int))
copy_loop_int (rptr, sptr, roffset, soffset, len, shift);
else if (size == sizeof(long))
copy_loop_long (rptr, sptr, roffset, soffset, len, shift);
else if (size == sizeof(double))
copy_loop_double (rptr, sptr, roffset, soffset, len, shift);
else if (size == sizeof(long double))
copy_loop_ldouble (rptr, sptr, roffset, soffset, len, shift);
else
{
char *dest = rptr;
const char *src = &sptr[shift * soffset];
for (n = 0; n < len - shift; n++)
{
memcpy (dest, src, size);
dest += roffset;
src += soffset;
}
for (src = sptr, n = 0; n < shift; n++)
{
memcpy (dest, src, size);
dest += roffset;
src += soffset;
}
}
}
/* Advance to the next section. */
rptr += rstride0;
@ -185,4 +252,3 @@ __cshift0_8 (gfc_array_char * ret, const gfc_array_char * array,
{
__cshift0 (ret, array, *pshift, pdim ? *pdim : 1);
}