; $Id: strcmp.asm $ ;; @file ; IPRT - No-CRT strcmp - AMD64 & X86. ; ; ; Copyright (C) 2006-2020 Oracle Corporation ; ; This file is part of VirtualBox Open Source Edition (OSE), as ; available from http://www.virtualbox.org. This file is free software; ; you can redistribute it and/or modify it under the terms of the GNU ; General Public License (GPL) as published by the Free Software ; Foundation, in version 2 as it comes in the "COPYING" file of the ; VirtualBox OSE distribution. VirtualBox OSE is distributed in the ; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. ; ; The contents of this file may alternatively be used under the terms ; of the Common Development and Distribution License Version 1.0 ; (CDDL) only, as it comes in the "COPYING.CDDL" file of the ; VirtualBox OSE distribution, in which case the provisions of the ; CDDL are applicable instead of those of the GPL. ; ; You may elect to license modified versions of this file under the ; terms and conditions of either the GPL or the CDDL or both. ; %include "iprt/asmdefs.mac" BEGINCODE ;; ; @param psz1 gcc: rdi msc: rcx x86:[esp+4] wcall: eax ; @param psz2 gcc: rsi msc: rdx x86:[esp+8] wcall: edx RT_NOCRT_BEGINPROC strcmp ; input %ifdef RT_ARCH_AMD64 %ifdef ASM_CALL64_MSC %define psz1 rcx %define psz2 rdx %else %define psz1 rdi %define psz2 rsi %endif %else %ifdef ASM_CALL32_WATCOM mov ecx, eax %else mov ecx, [esp + 4] mov edx, [esp + 8] %endif %define psz1 ecx %define psz2 edx %endif ; ; The loop. ; .next: mov al, [psz1] mov ah, [psz2] cmp al, ah jne .not_equal test al, al jz .equal mov al, [psz1 + 1] mov ah, [psz2 + 1] cmp al, ah jne .not_equal test al, al jz .equal mov al, [psz1 + 2] mov ah, [psz2 + 2] cmp al, ah jne .not_equal test al, al jz .equal mov al, [psz1 + 3] mov ah, [psz2 + 3] cmp al, ah jne .not_equal test al, al jz .equal add psz1, 4 add psz2, 4 jmp .next .equal: xor eax, eax ret .not_equal: movzx ecx, ah and eax, 0ffh sub eax, ecx ret ENDPROC RT_NOCRT(strcmp)