| .text |
| .p2align 2,0x90 |
| .globl mpdigdiv |
| mpdigdiv: |
| /* Prelude */ |
| pushl %ebp /* save on stack */ |
| pushl %ebx |
| |
| leal 12(%esp), %ebp /* %ebp = FP for now */ |
| movl 0(%ebp), %ebx /* dividend */ |
| movl 0(%ebx), %eax |
| movl 4(%ebx), %edx |
| movl 4(%ebp), %ebx /* divisor */ |
| movl 8(%ebp), %ebp /* quotient */ |
| |
| xorl %ecx, %ecx |
| cmpl %ebx, %edx /* dividend >= 2^32 * divisor */ |
| jae divovfl |
| cmpl %ecx, %ebx /* divisor == 1 */ |
| je divovfl |
| divl %ebx /* AX = DX:AX/BX */ |
| movl %eax, (%ebp) |
| done: |
| /* Postlude */ |
| popl %ebx |
| popl %ebp |
| ret |
| |
| /* return all 1's */ |
| divovfl: |
| notl %ecx |
| movl %ecx, (%ebp) |
| jmp done |
