2 # mpvecdigmul(mpdigit *b, int n, mpdigit m, mpdigit *p)
14 # hi = DX - constrained by hardware
15 # lo = AX - constrained by hardware
16 # b+n = SI - can't be BP
17 # p+n = DI - can't be BP
29 pushl %ebp # save on stack
34 leal 20(%esp), %ebp # %ebp = FP for now
35 movl 0(%ebp), %esi # b
36 movl 4(%ebp), %ecx # n
37 movl 8(%ebp), %ebx # m
38 movl 12(%ebp), %edi # p
42 addl %ecx, %esi # SI = b + n
43 addl %ecx, %edi # DI = p + n
46 movl (%esi, %ebp, 4), %eax # lo = b[i]
47 mull %ebx # hi, lo = b[i] * m
48 addl %ecx,%eax # lo += oldhi
50 incl %edx # hi += carry
52 addl %eax, (%edi, %ebp, 4) # p[i] += lo
54 incl %edx # hi += carry
56 movl %edx, %ecx # oldhi = hi
60 addl %ecx, (%edi, %ebp, 4) # p[n] + oldhi
61 adcl %eax, %eax # return carry out of p[n]