Category : C Source Code
Archive   : EMXLIB8C.ZIP
Filename : BCOPY.S
.globl _bcopy
/ void bcopy (const void *s1, void *s2, size_t n)
/ {
/ size_t i;
/
/ if ((size_t)s1 < (size_t)s2)
/ for (i = n; i > 0; --i)
/ ((char *)s2)[i-1] = ((char *)s1)[i-1];
/ else
/ for (i = 0; i < n; ++i)
/ ((char *)s2)[i] = ((char *)s1)[i];
/ }
/ assumes ds=es!
.text
.align 2, 0x90
_bcopy:
pushl %esi
pushl %edi
movl 3*4(%esp), %esi / s1
movl 4*4(%esp), %edi / s2
movl 5*4(%esp), %ecx / n
jecxz 9f
cmpl %edi, %esi
jb 1f
rep
movsb
jmp 9f
1: addl %ecx, %esi
addl %ecx, %edi
decl %esi
decl %edi
std
rep
movsb
cld
9: popl %edi
popl %esi
ret
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