source:
trunk/minix/lib/i86/em/em_mli4.s@
16
| Last change on this file since 16 was 9, checked in by , 14 years ago | |
|---|---|
| File size: 313 bytes | |
| Rev | Line | |
|---|---|---|
| [9] | 1 | .define .mli4 |
| 2 | .text | |
| 3 | ||
| 4 | yl=2 | |
| 5 | yh=4 | |
| 6 | ! x * y | |
| 7 | ! xl in ax | |
| 8 | ! xh in dx | |
| 9 | ||
| 10 | .mli4: | |
| 11 | mov bx,sp | |
| 12 | push dx | |
| 13 | mov cx,ax | |
| 14 | mul yh(bx) ! xl*yh | |
| 15 | pop dx | |
| 16 | push ax | |
| 17 | mov ax,dx | |
| 18 | mul yl(bx) ! xh * yl | |
| 19 | pop dx | |
| 20 | add dx,ax ! xh*yl+xl*yh | |
| 21 | mov ax,cx | |
| 22 | mov cx,dx | |
| 23 | mul yl(bx) ! xl*yl | |
| 24 | add dx,cx | |
| 25 | ret 4 |
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