// Function-wrapped Watcom pragmas
// by Jonathon Fowler (jonof@edgenetwk.com)
//
// These functions represent some of the more longer-winded pragmas
// from the original pragmas.h wrapped into functions for easier
// use since many jumps and whatnot make it harder to write macro-
// inline versions. I'll eventually convert these to macro-inline
// equivalents.		--Jonathon

//#include "pragmas.h"
#include "compat.h"

long dmval;

#if defined(__GNUC__) && defined(__i386__) && !defined(NOASM)	// NOASM

//
// GCC Inline Assembler version
//

#define ASM __asm__ __volatile__


long boundmulscale(long a, long b, long c)
{
    ASM (
        "imull %%ebx\n\t"
        "movl %%edx, %%ebx\n\t"		// mov ebx, edx
        "shrdl %%cl, %%edx, %%eax\n\t"	// mov eax, edx, cl
        "sarl %%cl, %%edx\n\t"		// sar edx, cl
        "xorl %%eax, %%edx\n\t"		// xor edx, eax
        "js 0f\n\t"			// js checkit
        "xorl %%eax, %%edx\n\t"		// xor edx, eax
        "jz 1f\n\t"			// js skipboundit
        "cmpl $0xffffffff, %%edx\n\t"	// cmp edx, 0xffffffff
        "je 1f\n\t"			// je skipboundit
        "0:\n\t"			// checkit:
        "movl %%ebx, %%eax\n\t"		// mov eax, ebx
        "sarl $31, %%eax\n\t"		// sar eax, 31
        "xorl $0x7fffffff, %%eax\n\t"	// xor eax, 0x7fffffff
        "1:"				// skipboundit:
    : "+a" (a), "+b" (b), "+c" (c)	// input eax ebx ecx
                :
                : "edx", "cc"
            );
    return a;
}


void clearbufbyte(void *D, long c, long a)
{
    ASM (
        "cmpl $4, %%ecx\n\t"
        "jae 1f\n\t"
        "testb $1, %%cl\n\t"
        "jz 0f\n\t"			// jz preskip
        "stosb\n\t"
        "0:\n\t"			// preskip:
        "shrl $1, %%ecx\n\t"
        "rep\n\t"
        "stosw\n\t"
        "jmp 5f\n\t"			// jmp endit
        "1:\n\t"			// intcopy:
        "testl $1, %%edi\n\t"
        "jz 2f\n\t"			// jz skip1
        "stosb\n\t"
        "decl %%ecx\n\t"
        "2:\n\t"			// skip1:
        "testl $2, %%edi\n\t"
        "jz 3f\n\t"			// jz skip2
        "stosw\n\t"
        "subl $2, %%ecx\n\t"
        "3:\n\t"			// skip2:
        "movl %%ecx, %%ebx\n\t"
        "shrl $2, %%ecx\n\t"
        "rep\n\t"
        "stosl\n\t"
        "testb $2, %%bl\n\t"
        "jz 4f\n\t"			// jz skip3
        "stosw\n\t"
        "4:\n\t"			// skip3:
        "testb $1, %%bl\n\t"
        "jz 5f\n\t"			// jz endit
        "stosb\n\t"
        "5:"				// endit
    : "+D" (D), "+c" (c), "+a" (a) :
                : "ebx", "memory", "cc"
            );
}

void copybufbyte(void *S, void *D, long c)
{
    ASM (
        "cmpl $4, %%ecx\n\t"		// cmp ecx, 4
        "jae 1f\n\t"
        "testb $1, %%cl\n\t"		// test cl, 1
        "jz 0f\n\t"
        "movsb\n\t"
        "0:\n\t"			// preskip:
        "shrl $1, %%ecx\n\t"		// shr ecx, 1
        "rep\n\t"
        "movsw\n\t"
        "jmp 5f\n\t"
        "1:\n\t"			// intcopy:
        "testl $1, %%edi\n\t"		// test edi, 1
        "jz 2f\n\t"
        "movsb\n\t"
        "decl %%ecx\n\t"
        "2:\n\t"			// skip1:
        "testl $2, %%edi\n\t"		// test edi, 2
        "jz 3f\n\t"
        "movsw\n\t"
        "subl $2, %%ecx\n\t"		// sub ecx, 2
        "3:\n\t"			// skip2:
        "movl %%ecx, %%ebx\n\t"		// mov ebx, ecx
        "shrl $2, %%ecx\n\t"		// shr ecx ,2
        "rep\n\t"
        "movsl\n\t"
        "testb $2, %%bl\n\t"		// test bl, 2
        "jz 4f\n\t"
        "movsw\n\t"
        "4:\n\t"			// skip3:
        "testb $1, %%bl\n\t"		// test bl, 1
        "jz 5f\n\t"
        "movsb\n\t"
        "5:"				// endit:
    : "+c" (c), "+S" (S), "+D" (D) :
                : "ebx", "memory", "cc"
            );
}

void copybufreverse(void *S, void *D, long c)
{
    ASM (
        "shrl $1, %%ecx\n\t"
        "jnc 0f\n\t"		// jnc skipit1
        "movb (%%esi), %%al\n\t"
        "decl %%esi\n\t"
        "movb %%al, (%%edi)\n\t"
        "incl %%edi\n\t"
        "0:\n\t"		// skipit1:
        "shrl $1, %%ecx\n\t"
        "jnc 1f\n\t"		// jnc skipit2
        "movw -1(%%esi), %%ax\n\t"
        "subl $2, %%esi\n\t"
        "rorw $8, %%ax\n\t"
        "movw %%ax, (%%edi)\n\t"
        "addl $2, %%edi\n\t"
        "1:\n\t"		// skipit2
        "testl %%ecx, %%ecx\n\t"
        "jz 3f\n\t"		// jz endloop
        "2:\n\t"		// begloop
        "movl -3(%%esi), %%eax\n\t"
        "subl $4, %%esi\n\t"
        "bswapl %%eax\n\t"
        "movl %%eax, (%%edi)\n\t"
        "addl $4, %%edi\n\t"
        "decl %%ecx\n\t"
        "jnz 2b\n\t"		// jnz begloop
        "3:"
    : "+S" (S), "+D" (D), "+c" (c) :
                : "eax", "memory", "cc"
            );
}

#elif defined(__WATCOMC__) && !defined(NOASM)	// __GNUC__ && __i386__

//
// Watcom C Inline Assembler version
//

#elif defined(_MSC_VER) && !defined(NOASM)		// __WATCOMC__

//
// Microsoft C Inline Assembler version
//

#else				// _MSC_VER

//
// Generic C version
//

void qinterpolatedown16(long bufptr, long num, long val, long add)
{ // gee, I wonder who could have provided this...
    long i, *lptr = (long *)bufptr;
    for (i=0;i<num;i++) { lptr[i] = (val>>16); val += add; }
}

void qinterpolatedown16short(long bufptr, long num, long val, long add)
{ // ...maybe the same person who provided this too?
    long i; short *sptr = (short *)bufptr;
    for (i=0;i<num;i++) { sptr[i] = (short)(val>>16); val += add; }
}

void clearbuf(void *d, long c, long a)
{
    long *p = (long*)d;
    while ((c--) > 0) *(p++) = a;
}

void copybuf(void *s, void *d, long c)
{
    long *p = (long*)s, *q = (long*)d;
    while ((c--) > 0) *(q++) = *(p++);
}

void swapbuf4(void *a, void *b, long c)
{
    long *p = (long*)a, *q = (long*)b;
    long x, y;
    while ((c--) > 0) {
        x = *q;
        y = *p;
        *(q++) = y;
        *(p++) = x;
    }
}

void clearbufbyte(void *D, long c, long a)
{ // Cringe City
    char *p = (char*)D;
    long m[4] = { 0xffl,0xff00l,0xff0000l,0xff000000l };
    long n[4] = { 0,8,16,24 };
    long z=0;
    while ((c--) > 0) {
        *(p++) = (char)((a & m[z])>>n[z]);
        z=(z+1)&3;
    }
}

void copybufbyte(void *S, void *D, long c)
{
    char *p = (char*)S, *q = (char*)D;
    while ((c--) > 0) *(q++) = *(p++);
}

void copybufreverse(void *S, void *D, long c)
{
    char *p = (char*)S, *q = (char*)D;
    while ((c--) > 0) *(q++) = *(p--);
}

#endif


