idigitaddsubmult.s

来自「Arithmetic for integers of almost unlimi」· S 代码 · 共 64 行

#include <config.h>

	.text
	.align 4
	.globl DigitAdd
DigitAdd:
	pushl %ebx
	movl 8(%esp),%ebx
	movl 12(%esp),%ecx
	movl 16(%esp),%edx
	movl 20(%esp),%eax
	btl $0,%eax
	adcl %edx,%ecx
	setc %al
	andl $255,%eax
	movl %ecx,(%ebx)
	popl %ebx
	ret

	.align 4
	.globl DigitSub
DigitSub:
	pushl %ebx
	movl 8(%esp),%ebx
	movl 12(%esp),%edx
	movl 16(%esp),%eax
	movl 20(%esp),%ecx
	btl $0,%ecx
	sbbl %eax,%edx
	setc %al
	andl $255,%eax
	movl %edx,(%ebx)
	popl %ebx
	ret

	.align 4
	.globl DigitMult
DigitMult:
	pushl %ebx
	movl 8(%esp),%ebx
	movl 12(%esp),%eax
	movl 16(%esp),%ecx
	mull %ecx
        movl %eax,(%ebx)
	movl %edx,%eax
	popl %ebx
	ret

	.align 4
	.globl DigitMultAdd
DigitMultAdd:
	pushl %ebx
	movl 8(%esp),%ebx
	movl 12(%esp),%eax
	movl 16(%esp),%edx
	movl 20(%esp),%ecx
	mull %edx
	addl %ecx,%eax
	adcl $0,%edx
        movl %eax,(%ebx)
	movl %edx,%eax
	popl %ebx
	ret