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/******************************************************
*
* zexy - implementation file
*
* copyleft (c) IOhannes m zmölnig
*
* 2000:forum::für::umläute:2005
*
* institute of electronic music and acoustics (iem)
*
******************************************************
*
* license: GNU General Public License v.2
*
******************************************************/
/*
sgn~: sign of a signal
2112:forum::für::umläute:2005
*/
#include "zexy.h"
typedef struct _sgnTilde
{
t_object x_obj;
} t_sgnTilde;
/* ------------------------ sgn~ ----------------------------- */
static t_class *sgnTilde_class;
static t_int *sgnTilde_perform(t_int *w)
{
t_float *in = (t_float *)(w[1]);
t_float *out = (t_float *)(w[2]);
int n = (int)(w[3]);
t_float x;
while (n--) {
if ((x=*in++)>0.) *out++=1.;
else if (x<0.) *out++=-1.;
else *out++=0.;
}
return (w+4);
}
static t_int *sgnTilde_perform8(t_int *w)
{
t_float *in = (t_float *)(w[1]);
t_float *out = (t_float *)(w[2]);
int n = (int)(w[3])>>3;
t_float x;
while(n--){
/* weirdly enough, the if/else/if/else is a lot faster than ()?:(()?:) */
if ((x=in[0])>0.) out[0]=1.; else if(x<0.) out[0]=-1.; else out[0]=0.;
if ((x=in[1])>0.) out[1]=1.; else if(x<0.) out[1]=-1.; else out[1]=0.;
if ((x=in[2])>0.) out[2]=1.; else if(x<0.) out[2]=-1.; else out[2]=0.;
if ((x=in[3])>0.) out[3]=1.; else if(x<0.) out[3]=-1.; else out[3]=0.;
if ((x=in[4])>0.) out[4]=1.; else if(x<0.) out[4]=-1.; else out[4]=0.;
if ((x=in[5])>0.) out[5]=1.; else if(x<0.) out[5]=-1.; else out[5]=0.;
if ((x=in[6])>0.) out[6]=1.; else if(x<0.) out[6]=-1.; else out[6]=0.;
if ((x=in[7])>0.) out[7]=1.; else if(x<0.) out[7]=-1.; else out[7]=0.;
in+=8;
out+=8;
}
return (w+4);
}
#ifdef __SSE__
static long l_bitmask[]={0x80000000, 0x80000000, 0x80000000, 0x80000000}; // sign bitmask
static t_int *sgnTilde_performSSE(t_int *w)
{
__m128 *in = (__m128 *)(w[1]);
__m128 *out = (__m128 *)(w[2]);
__m128 val;
int n = (int)(w[3])>>3; // we do 8x loop-unrolling
const __m128 sgnmask= _mm_loadu_ps((float*)l_bitmask);
const __m128 zero = _mm_setzero_ps();
const __m128 one = _mm_set_ps(1.f, 1.f, 1.f, 1.f);
__m128 xmm0, xmm1;
while (n--) {
val=in[0];
xmm0 = _mm_cmpneq_ps(val , zero);// mask for non-zeros
xmm1 = _mm_and_ps (val, sgnmask);// sign (without value)
xmm0 = _mm_and_ps (xmm0, one); // (abs) value: (val==0.f)?0.f:1.f
out[0]= _mm_or_ps (xmm1, xmm0);// merge sign and value
val=in[1];
xmm0 = _mm_cmpneq_ps(val , zero);
xmm1 = _mm_and_ps (val, sgnmask);
xmm0 = _mm_and_ps (xmm0, one);
out[1]= _mm_or_ps (xmm1, xmm0);
in +=2;
out+=2;
}
return (w+4);
}
#endif /* __SSE__ */
static void sgnTilde_dsp(t_sgnTilde *x, t_signal **sp)
{
ZEXY_USEVAR(x);
#ifdef __SSE__
if(
Z_SIMD_CHKBLOCKSIZE(sp[0]->s_n)&&
Z_SIMD_CHKALIGN(sp[0]->s_vec)&&
Z_SIMD_CHKALIGN(sp[1]->s_vec))
{
dsp_add(sgnTilde_performSSE, 3, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
} else
#endif
if (sp[0]->s_n & 7) {
dsp_add(sgnTilde_perform , 3, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
} else {
dsp_add(sgnTilde_perform8, 3, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
}
}
static void sgnTilde_helper(void)
{
post("\n%c sgn~ \t\t:: sign of a signal", HEARTSYMBOL);
}
static void *sgnTilde_new(void)
{
t_sgnTilde *x = (t_sgnTilde *)pd_new(sgnTilde_class);
outlet_new(&x->x_obj, gensym("signal"));
return (x);
}
void sgn_tilde_setup(void)
{
sgnTilde_class = class_new(gensym("sgn~"), (t_newmethod)sgnTilde_new, 0,
sizeof(t_sgnTilde), 0, A_DEFFLOAT, 0);
class_addmethod(sgnTilde_class, nullfn, gensym("signal"), 0);
class_addmethod(sgnTilde_class, (t_method)sgnTilde_dsp, gensym("dsp"), 0);
class_addmethod(sgnTilde_class, (t_method)sgnTilde_helper, gensym("help"), 0);
class_sethelpsymbol(sgnTilde_class, gensym("zexy/sigbinops+"));
zexy_register("sgn~");
}
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