VC++インラインアセンブリとMASMとのリンク

はじめに

を実際に動かしてみた。

環境

Windows 11 Pro (64bit)
Visual Studio Community 2022

インラインアセンブリ

ソースなど

dev.bat

@echo off
path %path%;D:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.34.31933\bin\Hostx64\x86
set include=%include%;D:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.34.31933\include
set include=%include%;C:\Program Files (x86)\Windows Kits\10\Include\10.0.19041.0\ucrt
set lib=%lib%;D:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.34.31933\lib\x86
set lib=%lib%;C:\Program Files (x86)\Windows Kits\10\Lib\10.0.19041.0\ucrt\x86
set lib=%lib%;C:\Program Files (x86)\Windows Kits\10\Lib\10.0.19041.0\um\x86
cmd

power2.cpp

/*
cl /Wall /FAscu power2.cpp
*/
#include <stdio.h>

int power2(int num, int power)
{
	__asm {
	mov	eax, num
	mov	ecx, power
	shl	eax, cl
	}
}

int main(void)
{
	printf("3 * 2^5 = %d\n", power2(3, 5));
}

実行例

D:\Projects\msvc>cl /Wall /FAscu power2.cpp
Microsoft(R) C/C++ Optimizing Compiler Version 19.34.31935 for x86
Copyright (C) Microsoft Corporation.  All rights reserved.

power2.cpp
Microsoft (R) Incremental Linker Version 14.34.31935.0
Copyright (C) Microsoft Corporation.  All rights reserved.

/out:power2.exe
power2.obj

D:\Projects\msvc>power2
3 * 2^5 = 96

D:\Projects\msvc>

MASMとのリンク

ソースなど

powera.asm

comment *
ml /c /Fl /Sa powera.asm
*
.model flat
.code
num$ = 8
power$ = 12
power2 proc c
	push	ebp
	mov	ebp, esp
	mov	eax, num$[ebp]
	mov	ecx, power$[ebp]
	shl	eax, cl
	pop	ebp
	ret
power2 endp
end

powerc.cpp

/*
cl /Wall /FAscu powerc.cpp powera.obj
*/
#include <stdio.h>

extern "C" int power2(int, int);

int main(void)
{
	printf("3 * 2^4 = %d\n", power2(3, 4));
}

実行例

D:\Projects\msvc>ml /c /Fl /Sa powera.asm
Microsoft (R) Macro Assembler Version 14.34.31935.0
Copyright (C) Microsoft Corporation.  All rights reserved.

 Assembling: powera.asm

D:\Projects\msvc>cl /Wall /FAscu powerc.cpp powera.obj
Microsoft(R) C/C++ Optimizing Compiler Version 19.34.31935 for x86
Copyright (C) Microsoft Corporation.  All rights reserved.

powerc.cpp
Microsoft (R) Incremental Linker Version 14.34.31935.0
Copyright (C) Microsoft Corporation.  All rights reserved.

/out:powerc.exe
powerc.obj
powera.obj

D:\Projects\msvc>powerc
3 * 2^4 = 48

D:\Projects\msvc>