idigitvecmult.c

来自「Arithmetic for integers of almost unlimi」· C语言 代码 · 共 45 行

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

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

#if !defined(USE_C_DIGITVECMULT)

DigitType 
DigitVecMult(res, a, m, l)
    DigitType *res, *a, m;
    int l;
 /* res[0..l-1] = a[0..l-1]*m; return CARRY;   */
{
__asm
    {
/*	.text
	.align 4
	.globl USCORE(DigitVecMult)
USCORE(DigitVecMult): */
	mov ebx, res		; DWORD PTR 20[esp]
	mov edi, a		; DWORD PTR 24[esp]
	mov esi, m		; DWORD PTR 28[esp]
	mov ecx, l		; DWORD PTR 32[esp]
	xor ebp,ebp
	test ecx,ecx		; 
	jz L2			; jump if ecx is zero
L1:
	mov eax, DWORD PTR [edi]
	add edi, 4
	mul esi
	add eax, ebp
	mov ebp, edx
	adc ebp, 0
	mov DWORD PTR [ebx], eax
	add ebx, 4
	dec ecx
	jnz L1
L2:
	mov eax, ebp
    }
}

#endif