6210N/A; $Id$

6210N/A;; @file

6210N/A; InnoTek Portable Runtime - No-CRT memcmp - AMD64 & X86.

6210N/A;

6210N/A

6210N/A;

6210N/A; Copyright (C) 2006 InnoTek Systemberatung GmbH

6210N/A;

6210N/A; This file is part of VirtualBox Open Source Edition (OSE), as

6210N/A; available from http://www.virtualbox.org. This file is free software;

6210N/A; you can redistribute it and/or modify it under the terms of the GNU

6210N/A; General Public License as published by the Free Software Foundation,

6210N/A; in version 2 as it comes in the "COPYING" file of the VirtualBox OSE

6210N/A; distribution. VirtualBox OSE is distributed in the hope that it will

6210N/A; be useful, but WITHOUT ANY WARRANTY of any kind.

6210N/A;

6210N/A; If you received this file as part of a commercial VirtualBox

6210N/A; distribution, then only the terms of your commercial VirtualBox

6210N/A; license agreement apply instead of the previous paragraph.

6210N/A;

6210N/A

6210N/A%include "iprt/asmdefs.mac"

6210N/A

6210N/ABEGINCODE

6210N/A

6210N/A;;

6210N/A; @param pv1 gcc: rdi msc: rcx x86:[esp+4]

6210N/A; @param pv2 gcc: rsi msc: rdx x86:[esp+8]

6210N/A; @param cb gcc: rdx msc: r8 x86:[esp+0ch]

6210N/ABEGINPROC RT_NOCRT(memcmp)

6210N/A cld

6210N/A

6210N/A ; Do the bulk of the work.

6210N/A%ifdef __AMD64__

6246N/A %ifdef ASM_CALL64_MSC

6210N/A mov r10, rdi ; save

6210N/A mov r11, rsi ; save

6210N/A mov rdi, rcx

6210N/A mov rsi, rdx

6210N/A mov rcx, r8

6210N/A mov rdx, r8

6210N/A %else

6210N/A mov rcx, rdx

6210N/A %endif

6210N/A mov rax, rdi ; save the return value

6210N/A shr rcx, 3

6210N/A repe cmpsq

6210N/A jne .not_equal_qword

6210N/A%else

6210N/A push edi

6210N/A push esi

6210N/A

6210N/A mov ecx, [esp + 0ch + 8]

6210N/A mov edi, [esp + 04h + 8]

6210N/A mov esi, [esp + 08h + 8]

6210N/A mov edx, ecx

6210N/A xor eax, eax

6210N/A jecxz .done

6210N/A shr ecx, 2

6210N/A repe cmpsd

6210N/A jne .not_equal_dword

6210N/A%endif

6210N/A

6210N/A ; The remaining bytes.

6210N/A%ifdef __AMD64__

6210N/A test dl, 4

6210N/A jz .dont_cmp_dword

6210N/A cmpsd

6210N/A jne .not_equal_dword

6210N/A%endif

6210N/A.dont_cmp_dword:

6210N/A test dl, 2

6210N/A jz .dont_cmp_word

6210N/A cmpsw

6210N/A jne .not_equal_word

6210N/A.dont_cmp_word:

6210N/A test dl, 1

6210N/A jz .dont_cmp_byte

6210N/A cmpsb

6210N/A jne .not_equal_byte

6210N/A.dont_cmp_byte:

6210N/A

6210N/A.done:

6210N/A%ifdef __AMD64__

6210N/A %ifdef ASM_CALL64_MSC

6210N/A mov rdi, r10

6210N/A mov rsi, r11

6210N/A %endif

6210N/A%else

6210N/A pop esi

6210N/A pop edi

6210N/A%endif

6210N/A ret

6210N/A

6210N/A;

6210N/A; Mismatches.

6210N/A;

6210N/A%ifdef __AMD64__

6210N/A.not_equal_qword:

6210N/A mov ecx, 8

6210N/A sub rsi, 8

6210N/A sub rdi, 8

6210N/A.not_equal_byte:

6210N/A repe cmpsb

6210N/A mov al, [xDI-1]

6210N/A movzx ecx, byte [xSI-1]

6210N/A sub eax, ecx

6210N/A jmp .done

6210N/A%endif

6210N/A

6210N/A.not_equal_dword:

6210N/A mov ecx, 4

6210N/A sub xSI, 4

6210N/A sub xDI, 4

6210N/A repe cmpsb

6210N/A%ifdef __AMD64__

6246N/A jmp .not_equal_byte

6210N/A%else

6210N/A.not_equal_byte:

6210N/A mov al, [xDI-1]

6210N/A movzx ecx, byte [xSI-1]

6246N/A sub eax, ecx

6210N/A jmp .done

6210N/A%endif

6210N/A

6210N/A.not_equal_word:

6210N/A mov ecx, 2

6246N/A sub xSI, 2

6210N/A sub xDI, 2

6210N/A repe cmpsb

6210N/A jmp .not_equal_byte

6210N/AENDPROC RT_NOCRT(memcmp)

6210N/A

6210N/A