diff options
Diffstat (limited to 'zap/source/amd64/mem/utf20len.S')
| -rw-r--r-- | zap/source/amd64/mem/utf20len.S | 38 |
1 files changed, 0 insertions, 38 deletions
diff --git a/zap/source/amd64/mem/utf20len.S b/zap/source/amd64/mem/utf20len.S deleted file mode 100644 index 03f8254..0000000 --- a/zap/source/amd64/mem/utf20len.S +++ /dev/null @@ -1,38 +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/. - -.globl zap_utf20len - -zap_utf20len: -# Address of the current character: -#define addr %rax -# Address of the first character: -#define start %rdi -# Current character: -#define chr %edx - - movq start,addr - - # Iterate over the string: -.loop: - - # Move the character into a register: - movl (addr),chr # chr = *addr - - # Check if we have reached the null-terminator: - testl chr,chr # if (chr == 0x0) - jz .done # goto done - - # Continue to the next character: - addq $0x4,addr # addr += 0x4 - jmp .loop # goto loop - - # Done: -.done: - - # Get the length: - subq start,addr # addr -= start - shrq $0x2,addr # addr /= 0x4 // Divide by four to get the number of doublewords rather than bytes. - - ret # return addr |