| The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1 | /* $OpenBSD: bcmp.S,v 1.3 2005/08/07 11:30:38 espie Exp $ */ |
| 2 | /* |
| 3 | * Written by J.T. Conklin <jtc@netbsd.org>. |
| 4 | * Public domain. |
| 5 | */ |
| 6 | |
| 7 | #include <machine/asm.h> |
| 8 | |
| 9 | ENTRY(bcmp) |
| 10 | pushl %edi |
| 11 | pushl %esi |
| 12 | movl 12(%esp),%edi |
| 13 | movl 16(%esp),%esi |
| 14 | xorl %eax,%eax /* clear return value */ |
| 15 | cld /* set compare direction forward */ |
| 16 | |
| 17 | movl 20(%esp),%ecx /* compare by words */ |
| 18 | shrl $2,%ecx |
| 19 | repe |
| 20 | cmpsl |
| 21 | jne L1 |
| 22 | |
| 23 | movl 20(%esp),%ecx /* compare remainder by bytes */ |
| 24 | andl $3,%ecx |
| 25 | repe |
| 26 | cmpsb |
| 27 | je L2 |
| 28 | |
| 29 | L1: incl %eax |
| 30 | L2: popl %esi |
| 31 | popl %edi |
| 32 | ret |