diff options
Diffstat (limited to 'zap/src/memeq.c')
-rw-r--r-- | zap/src/memeq.c | 112 |
1 files changed, 0 insertions, 112 deletions
diff --git a/zap/src/memeq.c b/zap/src/memeq.c deleted file mode 100644 index 7dce213..0000000 --- a/zap/src/memeq.c +++ /dev/null @@ -1,112 +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> - -#include <zap/mem.h> - -#include <stdbool.h> -#include <stddef.h> -#include <stdint.h> - -#if zap_priv_fastimpl -__asm__ ( - ".globl zap_memeq\n" - - "zap_memeq:\n" - /* - void const * lptr - size_t num - void const * rptr - */ -#if defined(sus_arch_amd64) - /* rdi: Address of the current left element. */ - /* rsi: Number of remaining elements. */ - /* rdx: Address of the current right element. */ - /* rax: Current left element. */ - /* rcx: Current right element. */ - ".wrdcmp:\n" - "cmpq $0x8,%rsi\n" - "jl .bytecmp\n" - "movq (%rdi),%rax\n" - "movq (%rdx),%rcx\n" - "cmpq %rax,%rcx\n" - "jne .neq\n" - "addq $0x8,%rdi\n" - "addq $0x8,%rdx\n" - "subq $0x8,%rsi\n" - "jmp .wrdcmp\n" - ".bytecmp:\n" - "testq %rsi,%rsi\n" - "jne .eq\n" /* If we have reached the final element, all previous elements have compared equal, and the memory sequences are equal. */ - "movb (%rdi),%al\n" - "movb (%rdx),%cl\n" - "cmpb %al,%cl\n" - "jne .neq\n" - "incq %rdi\n" - "incq %rdx\n" - "decq %rsi\n" - "jmp .bytecmp\n" - ".eq:\n" - "movb $0x1,%al\n" - "ret\n" - ".neq:\n" - "movb $0x0,%al\n" - "ret\n" -#elif defined(sus_arch_ia32) - /* eax: Address of the current left element. */ - "movl 0x4(%esp),%eax\n" - /* ecx: Number of remaining elements. */ - "movl 0x8(%esp),%ecx\n" - /* edx: Address of the current right element. */ - "movl 0xC(%esp),%edx\n" - /* ebx: Current left element. */ - "pushl %ebx\n" - /* ebx/esi: Current right element. */ - "pushl %esi\n" - ".wrdcmp:\n" - "cmpl $0x4,%ecx\n" - "jl .bytecmp\n" - "movl (%eax),%ebx\n" - "movl (%edx),%esi\n" - "cmpl %ebx,%esi\n" - "jne .neq\n" - "addl $0x4,%eax\n" - "addl $0x4,%edx\n" - "subl $0x4,%ecx\n" - "jmp .wrdcmp\n" - ".bytecmp:\n" - "testl %ecx,%ecx\n" - "jne .eq\n" /* If we have reached the final element, all previous elements have compared equal, and the memory sequences are equal. */ - "movb (%eax),%bl\n" - "movb (%edx),%bh\n" - "cmpb %bl,%bh\n" - "jne .neq\n" - "incl %eax\n" - "incl %edx\n" - "decl %ecx\n" - "jmp .bytecmp\n" - ".eq:\n" - "popl %ebx\n" - "popl %esi\n" - "movb $0x1,%al\n" - "ret\n" - ".neq:\n" - "popl %ebx\n" - "popl %esi\n" - "movb $0x0,%al\n" - "ret\n" -#endif -); -#else -bool zap_memeq(void const * const _lptr,size_t const _num,void const * const _rptr) { - unsigned char const * lpos = _lptr; - unsigned char const * rpos = _rptr; - unsigned char const * const afterbuf = lpos + _num; - for (;lpos != afterbuf;++lpos,++rpos) {sus_likely (*lpos != *rpos) {return false;}} - return true; -} -#endif |