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/*
* sgn~: sign of a signal
*
* (c) 1999-2011 IOhannes m zmölnig, forum::für::umläute, institute of electronic music and acoustics (iem)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "zexySIMD.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_sample *in = (t_sample *)(w[1]);
t_sample *out = (t_sample *)(w[2]);
int n = (int)(w[3]);
t_sample x;
while (n--) {
x=*in++;
if (x>0.) *out++=1.;
else if (x<0.) *out++=-1.;
else *out++=0.;
}
return (w+4);
}
static t_int *sgnTilde_perform8(t_int *w)
{
t_sample *in = (t_sample *)(w[1]);
t_sample *out = (t_sample *)(w[2]);
int n = (int)(w[3])>>3;
t_sample 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 int 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)
{
#ifdef __SSE__
if(
ZEXY_TYPE_EQUAL(t_sample, float) && /* currently SSE2 code is only for float (not for double) */
zexy_testSSE(sgnTilde_perform,
sgnTilde_performSSE,
1,1)
)
{
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"HEARTSYMBOL" sgn~ \t\t:: sign of a signal");
}
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("zigbinops"));
zexy_register("sgn~");
}
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