57 lines
1.2 KiB
C
57 lines
1.2 KiB
C
#ifndef _FVI_A_H
|
|
#define _FVI_A_H
|
|
|
|
#ifndef NO_ASM
|
|
#ifdef __WATCOMC__
|
|
int oflow_check(fix a,fix b);
|
|
|
|
#pragma aux oflow_check parm [eax] [ebx] value [eax] modify exact [eax ebx edx] = \
|
|
"cdq" \
|
|
"xor eax,edx" \
|
|
"sub eax,edx" \
|
|
"xchg eax,ebx" \
|
|
"cdq" \
|
|
"xor eax,edx" \
|
|
"sub eax,edx" \
|
|
"imul ebx" \
|
|
"sar edx,15" \
|
|
"or dx,dx" \
|
|
"setnz al" \
|
|
"movzx eax,al";
|
|
#else
|
|
#ifdef __GNUC__
|
|
static inline int oflow_check(fix a,fix b) {
|
|
register int __ret;
|
|
int dummy;
|
|
__asm__ (
|
|
" cdq;"
|
|
" xorl %%edx,%%eax;"
|
|
" subl %%edx,%%eax;"
|
|
" xchgl %%ebx,%%eax;"
|
|
" cdq;"
|
|
" xorl %%edx,%%eax;"
|
|
" subl %%edx,%%eax;"
|
|
" imull %%ebx;"
|
|
" sarl $15,%%edx;"
|
|
" orw %%dx,%%dx;"
|
|
" setnz %%al;"
|
|
" movzbl %%al,%%eax"
|
|
: "=a" (__ret), "=b" (dummy) : "a" (a), "1" (b) : "%edx");
|
|
return __ret;
|
|
}
|
|
#else
|
|
static int oflow_check(fix a,fix b) {
|
|
return 0; /* hoping the floating point fix-math is used */
|
|
}
|
|
/*#error unknown compiler*/
|
|
#endif
|
|
#endif
|
|
|
|
#else
|
|
static int oflow_check(fix a,fix b) {
|
|
return 0; /* hoping the floating point fix-math is used */
|
|
}
|
|
#endif
|
|
|
|
#endif
|