idigitveccsubto.c

Arithmetic for integers of almost unlimited size for C and C++. Developed and copyrighted by Ra

/* idigitveccsubto.c - inline assembler code for MSVC++6.0 on Intel586 */
/* TPf, Sep 1999 */

#include <iint.h>
#include <idigit.h>

#if !defined(USE_C_DIGITVECCSUBTO)

void 
DigitVecCsubto(a, b, l)
    DigitType *a, *b;
    int l;
 /* a[]-=b[l]; */
{
__asm
    {
/*	.text
	.align 4
	.globl USCORE(DigitVecCsubto)
USCORE(DigitVecCsubto): */
				; push ebx
				; push edi
				; push esi
	mov eax, a		; DWORD PTR 16[esp]
	mov ebx, b		; DWORD PTR 20[esp]
	mov ecx, l		; DWORD PTR 24[esp]
	xor edi,edi
	xor esi,esi
	test ecx,ecx
	jz L3
L1:
	shr esi, 1
	mov edx, DWORD PTR [eax+edi*4]
	sbb edx, DWORD PTR [ebx+edi*4]
	mov DWORD PTR [eax+edi*4], edx
	adc esi, 0
	inc edi
	dec ecx
	jnz L1
	test esi,esi
	jz L3
L2:
	sub DWORD PTR [eax+edi*4], 1
	inc edi
	jb L2
L3: 
				; pop esi
				; pop edi
				; pop ebx
    }
}

#endif