-/* Copyright (C) 1991, 1993, 1995, 1997, 1998, 2003, 2006 Free Software
- Foundation, Inc.
+/* Copyright (C) 1991, 1993, 1995, 1997-1998, 2003, 2006, 2009-2014 Free
+ Software Foundation, Inc.
Contributed by Torbjorn Granlund (tege@sics.se).
#include <string.h>
+#include <stdint.h>
+
#undef memcmp
#ifdef _LIBC
# define WORDS_BIGENDIAN
# endif
-#else /* Not in the GNU C library. */
+#else /* Not in the GNU C library. */
# include <sys/types.h>
/* Type to use for aligned memory operations.
This should normally be the biggest type supported by a single load
and store. Must be an unsigned type. */
-# define op_t unsigned long int
-# define OPSIZ (sizeof(op_t))
+# define op_t unsigned long int
+# define OPSIZ (sizeof(op_t))
/* Threshold value for when to enter the unrolled loops. */
-# define OP_T_THRES 16
+# define OP_T_THRES 16
/* Type to use for unaligned operations. */
typedef unsigned char byte;
# define MERGE(w0, sh_1, w1, sh_2) (((w0) << (sh_1)) | ((w1) >> (sh_2)))
# endif
-#endif /* In the GNU C library. */
+#endif /* In the GNU C library. */
#ifdef WORDS_BIGENDIAN
# define CMP_LT_OR_GT(a, b) ((a) > (b) ? 1 : -1)
#else
-# define CMP_LT_OR_GT(a, b) memcmp_bytes ((a), (b))
+# define CMP_LT_OR_GT(a, b) memcmp_bytes (a, b)
#endif
/* BE VERY CAREFUL IF YOU CHANGE THIS CODE! */
__inline
# endif
static int
-memcmp_bytes (long unsigned int a, long unsigned int b)
+memcmp_bytes (op_t a, op_t b)
{
- long int srcp1 = (long int) &a;
- long int srcp2 = (long int) &b;
+ const byte *srcp1 = (const byte *) &a;
+ const byte *srcp2 = (const byte *) &b;
op_t a0, b0;
do
{
- a0 = ((byte *) srcp1)[0];
- b0 = ((byte *) srcp2)[0];
+ a0 = srcp1[0];
+ b0 = srcp2[0];
srcp1 += 1;
srcp2 += 1;
}
}
#endif
-/* memcmp_common_alignment -- Compare blocks at SRCP1 and SRCP2 with LEN `op_t'
+/* memcmp_common_alignment -- Compare blocks at SRCP1 and SRCP2 with LEN 'op_t'
objects (not LEN bytes!). Both SRCP1 and SRCP2 should be aligned for
- memory operations on `op_t's. */
-#ifdef __GNUC__
+ memory operations on 'op_t's. */
+#ifdef __GNUC__
__inline
#endif
static int
-memcmp_common_alignment (long int srcp1, long int srcp2, size_t len)
+memcmp_common_alignment (uintptr_t srcp1, uintptr_t srcp2, size_t len)
{
op_t a0, a1;
op_t b0, b1;
goto do2;
case 0:
if (OP_T_THRES <= 3 * OPSIZ && len == 0)
- return 0;
+ return 0;
a0 = ((op_t *) srcp1)[0];
b0 = ((op_t *) srcp2)[0];
goto do3;
srcp2 += OPSIZ;
len -= 1;
if (OP_T_THRES <= 3 * OPSIZ && len == 0)
- goto do0;
+ goto do0;
/* Fall through. */
}
a0 = ((op_t *) srcp1)[0];
b0 = ((op_t *) srcp2)[0];
if (a1 != b1)
- return CMP_LT_OR_GT (a1, b1);
+ return CMP_LT_OR_GT (a1, b1);
do3:
a1 = ((op_t *) srcp1)[1];
b1 = ((op_t *) srcp2)[1];
if (a0 != b0)
- return CMP_LT_OR_GT (a0, b0);
+ return CMP_LT_OR_GT (a0, b0);
do2:
a0 = ((op_t *) srcp1)[2];
b0 = ((op_t *) srcp2)[2];
if (a1 != b1)
- return CMP_LT_OR_GT (a1, b1);
+ return CMP_LT_OR_GT (a1, b1);
do1:
a1 = ((op_t *) srcp1)[3];
b1 = ((op_t *) srcp2)[3];
if (a0 != b0)
- return CMP_LT_OR_GT (a0, b0);
+ return CMP_LT_OR_GT (a0, b0);
srcp1 += 4 * OPSIZ;
srcp2 += 4 * OPSIZ;
}
/* memcmp_not_common_alignment -- Compare blocks at SRCP1 and SRCP2 with LEN
- `op_t' objects (not LEN bytes!). SRCP2 should be aligned for memory
- operations on `op_t', but SRCP1 *should be unaligned*. */
-#ifdef __GNUC__
+ 'op_t' objects (not LEN bytes!). SRCP2 should be aligned for memory
+ operations on 'op_t', but SRCP1 *should be unaligned*. */
+#ifdef __GNUC__
__inline
#endif
static int
-memcmp_not_common_alignment (long int srcp1, long int srcp2, size_t len)
+memcmp_not_common_alignment (uintptr_t srcp1, uintptr_t srcp2, size_t len)
{
op_t a0, a1, a2, a3;
op_t b0, b1, b2, b3;
shl = 8 * (srcp1 % OPSIZ);
shr = 8 * OPSIZ - shl;
- /* Make SRCP1 aligned by rounding it down to the beginning of the `op_t'
+ /* Make SRCP1 aligned by rounding it down to the beginning of the 'op_t'
it points in the middle of. */
srcp1 &= -OPSIZ;
goto do2;
case 0:
if (OP_T_THRES <= 3 * OPSIZ && len == 0)
- return 0;
+ return 0;
a3 = ((op_t *) srcp1)[0];
a0 = ((op_t *) srcp1)[1];
b0 = ((op_t *) srcp2)[0];
srcp2 += 1 * OPSIZ;
len -= 1;
if (OP_T_THRES <= 3 * OPSIZ && len == 0)
- goto do0;
+ goto do0;
/* Fall through. */
}
{
a0 = ((op_t *) srcp1)[0];
b0 = ((op_t *) srcp2)[0];
- x = MERGE(a2, shl, a3, shr);
+ x = MERGE (a2, shl, a3, shr);
if (x != b3)
- return CMP_LT_OR_GT (x, b3);
+ return CMP_LT_OR_GT (x, b3);
do3:
a1 = ((op_t *) srcp1)[1];
b1 = ((op_t *) srcp2)[1];
- x = MERGE(a3, shl, a0, shr);
+ x = MERGE (a3, shl, a0, shr);
if (x != b0)
- return CMP_LT_OR_GT (x, b0);
+ return CMP_LT_OR_GT (x, b0);
do2:
a2 = ((op_t *) srcp1)[2];
b2 = ((op_t *) srcp2)[2];
- x = MERGE(a0, shl, a1, shr);
+ x = MERGE (a0, shl, a1, shr);
if (x != b1)
- return CMP_LT_OR_GT (x, b1);
+ return CMP_LT_OR_GT (x, b1);
do1:
a3 = ((op_t *) srcp1)[3];
b3 = ((op_t *) srcp2)[3];
- x = MERGE(a1, shl, a2, shr);
+ x = MERGE (a1, shl, a2, shr);
if (x != b2)
- return CMP_LT_OR_GT (x, b2);
+ return CMP_LT_OR_GT (x, b2);
srcp1 += 4 * OPSIZ;
srcp2 += 4 * OPSIZ;
/* This is the right position for do0. Please don't move
it into the loop. */
do0:
- x = MERGE(a2, shl, a3, shr);
+ x = MERGE (a2, shl, a3, shr);
if (x != b3)
return CMP_LT_OR_GT (x, b3);
return 0;
{
op_t a0;
op_t b0;
- long int srcp1 = (long int) s1;
- long int srcp2 = (long int) s2;
+ uintptr_t srcp1 = (uintptr_t) s1;
+ uintptr_t srcp2 = (uintptr_t) s2;
op_t res;
if (len >= OP_T_THRES)
{
/* There are at least some bytes to compare. No need to test
- for LEN == 0 in this alignment loop. */
+ for LEN == 0 in this alignment loop. */
while (srcp2 % OPSIZ != 0)
- {
- a0 = ((byte *) srcp1)[0];
- b0 = ((byte *) srcp2)[0];
- srcp1 += 1;
- srcp2 += 1;
- res = a0 - b0;
- if (res != 0)
- return res;
- len -= 1;
- }
-
- /* SRCP2 is now aligned for memory operations on `op_t'.
- SRCP1 alignment determines if we can do a simple,
- aligned compare or need to shuffle bits. */
+ {
+ a0 = ((byte *) srcp1)[0];
+ b0 = ((byte *) srcp2)[0];
+ srcp1 += 1;
+ srcp2 += 1;
+ res = a0 - b0;
+ if (res != 0)
+ return res;
+ len -= 1;
+ }
+
+ /* SRCP2 is now aligned for memory operations on 'op_t'.
+ SRCP1 alignment determines if we can do a simple,
+ aligned compare or need to shuffle bits. */
if (srcp1 % OPSIZ == 0)
- res = memcmp_common_alignment (srcp1, srcp2, len / OPSIZ);
+ res = memcmp_common_alignment (srcp1, srcp2, len / OPSIZ);
else
- res = memcmp_not_common_alignment (srcp1, srcp2, len / OPSIZ);
+ res = memcmp_not_common_alignment (srcp1, srcp2, len / OPSIZ);
if (res != 0)
- return res;
+ return res;
/* Number of bytes remaining in the interval [0..OPSIZ-1]. */
srcp1 += len & -OPSIZ;
srcp2 += 1;
res = a0 - b0;
if (res != 0)
- return res;
+ return res;
len -= 1;
}
projects / gnulib.git / blobdiff