| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* Copyright 2002 Andi Kleen */ |
| 2 | |
| 3 | #include <asm/cpufeature.h> |
| 4 | /* |
| 5 | * memcpy - Copy a memory block. |
| 6 | * |
| 7 | * Input: |
| 8 | * rdi destination |
| 9 | * rsi source |
| 10 | * rdx count |
| 11 | * |
| 12 | * Output: |
| 13 | * rax original destination |
| Andi Kleen | a5b250a | 2005-11-05 17:25:54 +0100 | [diff] [blame] | 14 | * |
| 15 | * TODO: check best memcpy for PSC |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | */ |
| 17 | |
| 18 | .globl __memcpy |
| 19 | .globl memcpy |
| 20 | .p2align 4 |
| 21 | __memcpy: |
| 22 | memcpy: |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | movq %rdi,%rax |
| 24 | movl %edx,%ecx |
| 25 | shrl $3,%ecx |
| 26 | andl $7,%edx |
| 27 | rep |
| 28 | movsq |
| 29 | movl %edx,%ecx |
| 30 | rep |
| 31 | movsb |
| 32 | ret |