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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/m68k/lib/memcpy.c | |
download | linux-fsl-qoriq-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'arch/m68k/lib/memcpy.c')
-rw-r--r-- | arch/m68k/lib/memcpy.c | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/arch/m68k/lib/memcpy.c b/arch/m68k/lib/memcpy.c new file mode 100644 index 0000000..73e1818 --- /dev/null +++ b/arch/m68k/lib/memcpy.c @@ -0,0 +1,75 @@ +#include <linux/types.h> + +void * memcpy(void * to, const void * from, size_t n) +{ + void *xto = to; + size_t temp, temp1; + + if (!n) + return xto; + if ((long) to & 1) + { + char *cto = to; + const char *cfrom = from; + *cto++ = *cfrom++; + to = cto; + from = cfrom; + n--; + } + if (n > 2 && (long) to & 2) + { + short *sto = to; + const short *sfrom = from; + *sto++ = *sfrom++; + to = sto; + from = sfrom; + n -= 2; + } + temp = n >> 2; + if (temp) + { + long *lto = to; + const long *lfrom = from; + + __asm__ __volatile__("movel %2,%3\n\t" + "andw #7,%3\n\t" + "lsrl #3,%2\n\t" + "negw %3\n\t" + "jmp %%pc@(1f,%3:w:2)\n\t" + "4:\t" + "movel %0@+,%1@+\n\t" + "movel %0@+,%1@+\n\t" + "movel %0@+,%1@+\n\t" + "movel %0@+,%1@+\n\t" + "movel %0@+,%1@+\n\t" + "movel %0@+,%1@+\n\t" + "movel %0@+,%1@+\n\t" + "movel %0@+,%1@+\n\t" + "1:\t" + "dbra %2,4b\n\t" + "clrw %2\n\t" + "subql #1,%2\n\t" + "jpl 4b\n\t" + : "=a" (lfrom), "=a" (lto), "=d" (temp), + "=&d" (temp1) + : "0" (lfrom), "1" (lto), "2" (temp) + ); + to = lto; + from = lfrom; + } + if (n & 2) + { + short *sto = to; + const short *sfrom = from; + *sto++ = *sfrom++; + to = sto; + from = sfrom; + } + if (n & 1) + { + char *cto = to; + const char *cfrom = from; + *cto = *cfrom; + } + return xto; +} |