diff options
Diffstat (limited to 'zap/src/mem/memeq.S')
| -rw-r--r-- | zap/src/mem/memeq.S | 82 |
1 files changed, 0 insertions, 82 deletions
diff --git a/zap/src/mem/memeq.S b/zap/src/mem/memeq.S deleted file mode 100644 index cf554c2..0000000 --- a/zap/src/mem/memeq.S +++ /dev/null @@ -1,82 +0,0 @@ -/* - Copyright 2022 Gabriel Jensen. - This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. - If a copy of the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/. -*/ - -#include <zap/priv.h> - -.globl zap_memeq - -zap_memeq: - - /* - void const * lptr - zap_sz num - void const * rptr - */ - -#if defined(__amd64__) - - /* rdi: Left pointer. */ - /* rsi: Number of remaining elements. */ - /* rdx: Right pointer. */ - /* rax: Current left element. */ - /* rcx: Current right element. */ - - /* Compare words: */ -.wrdcmp: - - /* Check if there's at least one word left: */ - cmpq $0x8,%rsi - jl .bytecmp /* If not, skip to byte checks: */ - - /* Copy the values into registers: */ - movq (%rdi),%rax - movq (%rdx),%rcx - - /* Check if the words are equal: */ - cmpq %rax,%rcx - jne .neq - - /* Mark eight more bytes as equal: */ - addq $0x8,%rdi - addq $0x8,%rdx - subq $0x8,%rsi - - /* Continue to the next word: */ - jmp .wrdcmp - - /* Compare bytes: */ -.bytecmp: - - /* Check if there are any bytes left: */ - testq %rsi,%rsi - jz .eq /* If we have reached the final element, all previous elements have compared equal, and the memory sequences are equal. */ - - /* Copy the values into registers: */ - movb (%rdi),%al - movb (%rdx),%cl - - cmpb %al,%cl - jne .neq - - /* Mark another byte as equal: */ - incq %rdi - incq %rdx - decq %rsi - - /* Continue to the next byte: */ - jmp .bytecmp - - /* The memory sequences have compared equal: */ -.eq: - movb $0xFF,%al - ret - - /* The memory sequences have compared NOT equal: */ -.neq: - movb $0x0,%al - ret - -#endif |