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/*=============================================================================
//
// This software has been released under the terms of the GNU Public
// license. See http://www.gnu.org/copyleft/gpl.html for details.
//
// Copyright 2001 Anders Johansson ajh@atri.curtin.edu.au
//
//=============================================================================
*/
#ifndef __FIR_H__
#define __FIR_H__
/* 4, 8 and 16 tap FIR filters implemented using SSE instructions
int16_t* x Input data
int16_t* y Output value
int16_t* w Filter weights
C function
for(int i = 0 ; i < L ; i++)
*y += w[i]*x[i];
*/
#ifdef HAVE_SSE
// This block should be MMX only compatible, but it isn't...
#ifdef L4
#define LOAD_QUE(x) \
__asm __volatile("movq %0, %%mm2\n\t" \
: \
:"m"((x)[0]) \
:"memory");
#define SAVE_QUE(x) \
__asm __volatile("movq %%mm2, %0\n\t" \
:"=m"(x[0]) \
: \
:"memory");
#define UPDATE_QUE(in) \
__asm __volatile("psllq $16, %%mm2\n\t" \
"pinsrw $0, %0,%%mm2\n\t" \
: \
:"m" ((in)[0]) \
:"memory");
#define FIR(x,w,y) \
__asm __volatile("movq %%mm2, %%mm0\n\t" \
"pmaddwd %1, %%mm0\n\t" \
"movq %%mm0, %%mm1\n\t" \
"psrlq $32, %%mm1\n\t" \
"paddd %%mm0, %%mm1\n\t" \
"movd %%mm1, %%esi\n\t" \
"shrl $16, %%esi\n\t" \
"movw %%si, %0\n\t" \
: "=m" ((y)[0]) \
: "m" ((w)[0]) \
: "memory", "%esi");
#endif /* L4 */
// It is possible to make the 8 bit filter a lot faster by using the
// 128 bit registers, feel free to optimize.
#ifdef L8
#define LOAD_QUE(x) \
__asm __volatile("movq %0, %%mm5\n\t" \
"movq %1, %%mm4\n\t" \
: \
:"m"((x)[0]), \
"m"((x)[4]) \
:"memory");
#define SAVE_QUE(x) \
__asm __volatile("movq %%mm5, %0\n\t" \
"movq %%mm4, %1\n\t" \
:"=m"((x)[0]), \
"=m"((x)[4]) \
: \
:"memory");
// Below operation could replace line 2 to 5 in macro below but can
// not cause of compiler bug ???
// "pextrw $3, %%mm5,%%eax\n\t"
#define UPDATE_QUE(in) \
__asm __volatile("psllq $16, %%mm4\n\t" \
"movq %%mm5, %%mm0\n\t" \
"psrlq $48, %%mm0\n\t" \
"movd %%mm0, %%eax\n\t" \
"pinsrw $0, %%eax,%%mm4\n\t" \
"psllq $16, %%mm5\n\t" \
"pinsrw $0, %0,%%mm5\n\t" \
: \
:"m" ((in)[0]) \
:"memory", "%eax");
#define FIR(x,w,y) \
__asm __volatile("movq %%mm5, %%mm0\n\t" \
"pmaddwd %1, %%mm0\n\t" \
"movq %%mm4, %%mm1\n\t" \
"pmaddwd %2, %%mm1\n\t" \
"paddd %%mm1, %%mm0\n\t" \
"movq %%mm0, %%mm1\n\t" \
"psrlq $32, %%mm1\n\t" \
"paddd %%mm0, %%mm1\n\t" \
"movd %%mm1, %%esi\n\t" \
"shrl $16, %%esi\n\t" \
"movw %%si, %0\n\t" \
: "=m" ((y)[0]) \
: "m" ((w)[0]), \
"m" ((w)[4]) \
: "memory", "%esi");
#endif /* L8 */
#else /* HAVE_SSE */
#define LOAD_QUE(x)
#define SAVE_QUE(x)
#define UPDATE_QUE(inm) \
xi=(--xi)&(L-1); \
x[xi]=x[xi+L]=*inm;
#ifdef L4
#define FIR(x,w,y) \
y[0]=(w[0]*x[0]+w[1]*x[1]+w[2]*x[2]+w[3]*x[3]) >> 16;
#else
#define FIR(x,w,y){ \
int16_t a = (w[0]*x[0]+w[1]*x[1]+w[2]*x[2]+w[3]*x[3]) >> 16; \
int16_t b = (w[4]*x[4]+w[5]*x[5]+w[6]*x[6]+w[7]*x[7]) >> 16; \
y[0] = a+b; \
}
#endif /* L4 */
#endif /* HAVE_SSE */
#endif /* __FIR_H__ */
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