opt31.c

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C语言 代码 · 共 102 行

// wpp -mc -3 -d1 -zff -s
#include "fail.h"

unsigned failed;

#if defined(__I86__)

void __far *c;

void _linget( unsigned long __far * );
#pragma aux _linget = \
        "pop ax" \
        "pop dx" \
        "push dx" \
        "push ax" \
        "cmp ax,word ptr c" \
        "jne L1" \
        "cmp dx,word ptr c+2" \
        "je L2" \
        "L1: inc word ptr failed" \
        "jmp L0" \
        "L2: push si" \
        "push es" \
        "mov si,ax" \
        "mov es,dx" \
        "cmp word ptr es:[si],5" \
        "jne L3" \
        "cmp word ptr es:2[si],0" \
        "je L4" \
        "L3: inc word ptr failed" \
        "L4: pop es" \
        "pop si" \
        "L0: xor ax,ax" /* CG doesn't push enough so we make sure things are OK */ \
        "push ax" \
        "push ax" \
        parm caller [] \
        modify [ax dx sp];

#elif defined(__386__)

void __far *c;

void _linget( unsigned long __far * );
#pragma aux _linget = \
        "pop eax" \
        "pop edx" \
        "push edx" \
        "push eax" \
        "cmp eax,dword ptr c" \
        "jne L1" \
        "cmp dx,word ptr c+4" \
        "je L2" \
        "L1: inc dword ptr failed" \
        "jmp L0" \
        "L2: push esi" \
        "push es" \
        "mov esi,eax" \
        "mov es,dx" \
        "cmp dword ptr es:[esi],5" \
        "je L4" \
        "L3: inc dword ptr failed" \
        "L4: pop es" \
        "pop esi" \
        "L0: xor eax,eax" /* CG doesn't push enough so we make sure things are OK */ \
        "push eax" \
        "push eax" \
        parm caller [] \
        modify [eax edx esp];


#else

void *c;

void _linget( unsigned long *p )
{
    if( p != c ) ++failed;
    if( *p != 5 ) ++failed;
}

#endif

typedef struct {
    unsigned long       ul;
} TestStr, *PTestStr;

void __saveregs test( PTestStr pOut )
{
    pOut->ul = 5;
    _linget( &pOut->ul );
    _linget( &pOut->ul );
}

int main() {
    TestStr v;

    c = &(v.ul);
    test( &v );
    if( failed ) fail(__LINE__);
    _PASS;
}