_agc_energy_acum.asm

自己写的汇编

//prototype: void _agc_energy_acum(unsigned char *src, unsigned short *energy, int len)

.section program;
.global __agc_energy_acum;

__agc_energy_acum:

	[--sp] = (r7:3,p5:2);
	p0 = r0; //get the input src pointer
	p2 = r1;
	p3 = r2;
	
	r4 = 0;
	
	r1 = 0x7c;
		
	r0 = b[p0++](z);	//input data
	
	r2 = r0 - r1;
	
	lsetup (begin_loop, end_loop) lc0 = p3;
	begin_loop:
		r3 = r2.l * r2.l(is) || r0 = b[p0++](z) ;
		r2 = r0 - r1;
	end_loop:
		r4 = r3 + r4(s);
	
	[p2] = r4;
	
	(r7:3, p5:2) = [sp++];
	rts;
	
__agc_energy_acum.end: