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2008-02-11 Patrick Mansfield <patmans@us.ibm.com>

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* libc/machine/spu/strlen.c: Remove the len variable and unneeded
        calculation of its value.
This commit is contained in:
Jeff Johnston
2008-02-11 22:14:46 +00:00
parent dbc81478fa
commit 9b924fc304
2 changed files with 17 additions and 10 deletions
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5
newlib/ChangeLog
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@@ -1,3 +1,8 @@
2008-02-11 Patrick Mansfield <patmans@us.ibm.com>
* libc/machine/spu/strlen.c: Remove the len variable and unneeded
calculation of its value.
2008-01-25 Hans-Peter Nilsson <hp@bitrange.com> 2008-01-25 Hans-Peter Nilsson <hp@bitrange.com>
* libc/sys/mmixware/isatty.c (_isatty): Renamed from isatty. * libc/sys/mmixware/isatty.c (_isatty): Renamed from isatty.

22
newlib/libc/machine/spu/strlen.c
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@@ -33,34 +33,36 @@
#include <spu_intrinsics.h> #include <spu_intrinsics.h>
#include <stddef.h> #include <stddef.h>
/* Calculates the length of the string s, not including the terminating /*
* Calculates the length of the string s, not including the terminating
* \0 character. * \0 character.
*/ */
size_t strlen(const char *s) size_t strlen(const char *s)
{ {
size_t len;
unsigned int cnt, cmp, skip, mask; unsigned int cnt, cmp, skip, mask;
vec_uchar16 *ptr, data; vec_uchar16 *ptr, data;
/* Compensate for initial mis-aligned string. /*
* Compensate for initial mis-aligned string.
*/ */
ptr = (vec_uchar16 *)s; ptr = (vec_uchar16 *)s; /* implicit 16 byte alignment when dereferenced */
skip = (unsigned int)(ptr) & 15; skip = (unsigned int)(ptr) & 15;
mask = 0xFFFF >> skip; mask = 0xFFFF >> skip;
data = *ptr++; data = *ptr;
cmp = spu_extract(spu_gather(spu_cmpeq(data, 0)), 0); cmp = spu_extract(spu_gather(spu_cmpeq(data, 0)), 0);
cmp &= mask; cmp &= mask;
cnt = spu_extract(spu_cntlz(spu_promote(cmp, 0)), 0); cnt = spu_extract(spu_cntlz(spu_promote(cmp, 0)), 0);
len = cnt - (skip + 16);
while (cnt == 32) { while (cnt == 32) {
data = *ptr++; data = *++ptr;
len -= 16;
cnt = spu_extract(spu_cntlz(spu_gather(spu_cmpeq(data, 0))), 0); cnt = spu_extract(spu_cntlz(spu_gather(spu_cmpeq(data, 0))), 0);
len += cnt;
} }
return (len); /*
* The length is ptr aligned down to a 16 byte boundary, plus the offset
* to the zero byte, minus the starting address s.
*/
return ((((int) ptr & ~0xf) + (cnt - 16)) - (int) s);
} }