mirror of
https://github.com/tildearrow/furnace.git
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333 lines
9.1 KiB
C
333 lines
9.1 KiB
C
/*
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* Copyright (c) 2003, 2007-11 Matteo Frigo
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* Copyright (c) 2003, 2007-11 Massachusetts Institute of Technology
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*
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* Generic256d added by Romain Dolbeau, and turned into simd-generic256.h
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* with single & double precision by Erik Lindahl.
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* Romain Dolbeau hereby places his modifications in the public domain.
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* Erik Lindahl hereby places his modifications in the public domain.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#if defined(FFTW_LDOUBLE) || defined(FFTW_QUAD)
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# error "Generic simd256 only works in single or double precision"
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#endif
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#define SIMD_SUFFIX _generic_simd256 /* for renaming */
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#ifdef FFTW_SINGLE
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# define DS(d,s) s /* single-precision option */
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# define VDUPL(x) {x[0],x[0],x[2],x[2],x[4],x[4],x[6],x[6]}
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# define VDUPH(x) {x[1],x[1],x[3],x[3],x[5],x[5],x[7],x[7]}
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# define DVK(var, val) V var = {val,val,val,val,val,val,val,val}
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#else
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# define DS(d,s) d /* double-precision option */
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# define VDUPL(x) {x[0],x[0],x[2],x[2]}
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# define VDUPH(x) {x[1],x[1],x[3],x[3]}
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# define DVK(var, val) V var = {val, val, val, val}
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#endif
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#define VL DS(2,4) /* SIMD vector length, in term of complex numbers */
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#define SIMD_VSTRIDE_OKA(x) DS(SIMD_STRIDE_OKA(x),((x) == 2))
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#define SIMD_STRIDE_OKPAIR SIMD_STRIDE_OK
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typedef DS(double,float) V __attribute__ ((vector_size(32)));
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#define VADD(a,b) ((a)+(b))
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#define VSUB(a,b) ((a)-(b))
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#define VMUL(a,b) ((a)*(b))
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#define LDK(x) x
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static inline V LDA(const R *x, INT ivs, const R *aligned_like)
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{
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V var;
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(void)aligned_like; /* UNUSED */
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return *(const V *)x;
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}
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static inline void STA(R *x, V v, INT ovs, const R *aligned_like)
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{
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(void)aligned_like; /* UNUSED */
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(void)ovs; /* UNUSED */
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*(V *)x = v;
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}
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static inline V LD(const R *x, INT ivs, const R *aligned_like)
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{
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V var;
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(void)aligned_like; /* UNUSED */
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var[0] = x[0];
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var[1] = x[1];
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var[2] = x[ivs];
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var[3] = x[ivs+1];
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#ifdef FFTW_SINGLE
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var[4] = x[2*ivs];
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var[5] = x[2*ivs+1];
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var[6] = x[3*ivs];
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var[7] = x[3*ivs+1];
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#endif
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return var;
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}
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/* ST has to be separate due to the storage hack requiring reverse order */
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static inline void ST(R *x, V v, INT ovs, const R *aligned_like)
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{
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(void)aligned_like; /* UNUSED */
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#ifdef FFTW_SINGLE
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*(x + 3*ovs ) = v[6];
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*(x + 3*ovs + 1) = v[7];
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*(x + 2*ovs ) = v[4];
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*(x + 2*ovs + 1) = v[5];
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*(x + ovs ) = v[2];
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*(x + ovs + 1) = v[3];
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*(x ) = v[0];
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*(x + 1) = v[1];
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#else
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*(x + ovs ) = v[2];
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*(x + ovs + 1) = v[3];
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*(x ) = v[0];
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*(x + 1) = v[1];
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#endif
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}
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#ifdef FFTW_SINGLE
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#define STM2(x, v, ovs, a) /* no-op */
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static inline void STN2(R *x, V v0, V v1, INT ovs)
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{
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x[ 0] = v0[0];
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x[ 1] = v0[1];
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x[ 2] = v1[0];
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x[ 3] = v1[1];
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x[ ovs ] = v0[2];
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x[ ovs + 1] = v0[3];
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x[ ovs + 2] = v1[2];
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x[ ovs + 3] = v1[3];
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x[2*ovs ] = v0[4];
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x[2*ovs + 1] = v0[5];
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x[2*ovs + 2] = v1[4];
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x[2*ovs + 3] = v1[5];
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x[3*ovs ] = v0[6];
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x[3*ovs + 1] = v0[7];
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x[3*ovs + 2] = v1[6];
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x[3*ovs + 3] = v1[7];
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}
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# define STM4(x, v, ovs, aligned_like) /* no-op */
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static inline void STN4(R *x, V v0, V v1, V v2, V v3, INT ovs)
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{
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*(x ) = v0[0];
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*(x + 1) = v1[0];
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*(x + 2) = v2[0];
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*(x + 3) = v3[0];
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*(x + ovs ) = v0[1];
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*(x + ovs + 1) = v1[1];
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*(x + ovs + 2) = v2[1];
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*(x + ovs + 3) = v3[1];
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*(x + 2 * ovs ) = v0[2];
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*(x + 2 * ovs + 1) = v1[2];
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*(x + 2 * ovs + 2) = v2[2];
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*(x + 2 * ovs + 3) = v3[2];
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*(x + 3 * ovs ) = v0[3];
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*(x + 3 * ovs + 1) = v1[3];
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*(x + 3 * ovs + 2) = v2[3];
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*(x + 3 * ovs + 3) = v3[3];
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*(x + 4 * ovs ) = v0[4];
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*(x + 4 * ovs + 1) = v1[4];
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*(x + 4 * ovs + 2) = v2[4];
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*(x + 4 * ovs + 3) = v3[4];
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*(x + 5 * ovs ) = v0[5];
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*(x + 5 * ovs + 1) = v1[5];
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*(x + 5 * ovs + 2) = v2[5];
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*(x + 5 * ovs + 3) = v3[5];
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*(x + 6 * ovs ) = v0[6];
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*(x + 6 * ovs + 1) = v1[6];
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*(x + 6 * ovs + 2) = v2[6];
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*(x + 6 * ovs + 3) = v3[6];
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*(x + 7 * ovs ) = v0[7];
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*(x + 7 * ovs + 1) = v1[7];
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*(x + 7 * ovs + 2) = v2[7];
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*(x + 7 * ovs + 3) = v3[7];
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}
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#else
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/* FFTW_DOUBLE */
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#define STM2 ST
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#define STN2(x, v0, v1, ovs) /* nop */
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#define STM4(x, v, ovs, aligned_like) /* no-op */
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static inline void STN4(R *x, V v0, V v1, V v2, V v3, INT ovs) {
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*(x ) = v0[0];
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*(x + 1) = v1[0];
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*(x + 2) = v2[0];
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*(x + 3) = v3[0];
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*(x + ovs ) = v0[1];
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*(x + ovs + 1) = v1[1];
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*(x + ovs + 2) = v2[1];
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*(x + ovs + 3) = v3[1];
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*(x + 2 * ovs ) = v0[2];
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*(x + 2 * ovs + 1) = v1[2];
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*(x + 2 * ovs + 2) = v2[2];
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*(x + 2 * ovs + 3) = v3[2];
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*(x + 3 * ovs ) = v0[3];
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*(x + 3 * ovs + 1) = v1[3];
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*(x + 3 * ovs + 2) = v2[3];
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*(x + 3 * ovs + 3) = v3[3];
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}
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#endif
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static inline V FLIP_RI(V x)
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{
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#ifdef FFTW_SINGLE
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return (V){x[1],x[0],x[3],x[2],x[5],x[4],x[7],x[6]};
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#else
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return (V){x[1],x[0],x[3],x[2]};
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#endif
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}
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static inline V VCONJ(V x)
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{
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#ifdef FFTW_SINGLE
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return (x * (V){1.0,-1.0,1.0,-1.0,1.0,-1.0,1.0,-1.0});
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#else
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return (x * (V){1.0,-1.0,1.0,-1.0});
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#endif
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}
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static inline V VBYI(V x)
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{
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return FLIP_RI(VCONJ(x));
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}
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/* FMA support */
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#define VFMA(a, b, c) VADD(c, VMUL(a, b))
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#define VFNMS(a, b, c) VSUB(c, VMUL(a, b))
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#define VFMS(a, b, c) VSUB(VMUL(a, b), c)
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#define VFMAI(b, c) VADD(c, VBYI(b))
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#define VFNMSI(b, c) VSUB(c, VBYI(b))
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#define VFMACONJ(b,c) VADD(VCONJ(b),c)
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#define VFMSCONJ(b,c) VSUB(VCONJ(b),c)
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#define VFNMSCONJ(b,c) VSUB(c, VCONJ(b))
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static inline V VZMUL(V tx, V sr)
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{
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V tr = VDUPL(tx);
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V ti = VDUPH(tx);
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tr = VMUL(sr, tr);
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sr = VBYI(sr);
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return VFMA(ti, sr, tr);
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}
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static inline V VZMULJ(V tx, V sr)
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{
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V tr = VDUPL(tx);
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V ti = VDUPH(tx);
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tr = VMUL(sr, tr);
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sr = VBYI(sr);
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return VFNMS(ti, sr, tr);
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}
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static inline V VZMULI(V tx, V sr)
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{
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V tr = VDUPL(tx);
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V ti = VDUPH(tx);
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ti = VMUL(ti, sr);
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sr = VBYI(sr);
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return VFMS(tr, sr, ti);
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}
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static inline V VZMULIJ(V tx, V sr)
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{
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V tr = VDUPL(tx);
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V ti = VDUPH(tx);
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ti = VMUL(ti, sr);
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sr = VBYI(sr);
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return VFMA(tr, sr, ti);
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}
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/* twiddle storage #1: compact, slower */
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#ifdef FFTW_SINGLE
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# define VTW1(v,x) {TW_CEXP, v, x}, {TW_CEXP, v+1, x}, {TW_CEXP, v+2, x}, {TW_CEXP, v+3, x}
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#else
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# define VTW1(v,x) {TW_CEXP, v, x}, {TW_CEXP, v+1, x}
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#endif
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#define TWVL1 (VL)
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static inline V BYTW1(const R *t, V sr)
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{
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return VZMUL(LDA(t, 2, t), sr);
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}
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static inline V BYTWJ1(const R *t, V sr)
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{
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return VZMULJ(LDA(t, 2, t), sr);
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}
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/* twiddle storage #2: twice the space, faster (when in cache) */
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#ifdef FFTW_SINGLE
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# define VTW2(v,x) \
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{TW_COS, v, x}, {TW_COS, v, x}, {TW_COS, v+1, x}, {TW_COS, v+1, x}, \
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{TW_COS, v+2, x}, {TW_COS, v+2, x}, {TW_COS, v+3, x}, {TW_COS, v+3, x}, \
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{TW_SIN, v, -x}, {TW_SIN, v, x}, {TW_SIN, v+1, -x}, {TW_SIN, v+1, x}, \
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{TW_SIN, v+2, -x}, {TW_SIN, v+2, x}, {TW_SIN, v+3, -x}, {TW_SIN, v+3, x}
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#else
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# define VTW2(v,x) \
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{TW_COS, v, x}, {TW_COS, v, x}, {TW_COS, v+1, x}, {TW_COS, v+1, x}, \
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{TW_SIN, v, -x}, {TW_SIN, v, x}, {TW_SIN, v+1, -x}, {TW_SIN, v+1, x}
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#endif
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#define TWVL2 (2 * VL)
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static inline V BYTW2(const R *t, V sr)
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{
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const V *twp = (const V *)t;
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V si = FLIP_RI(sr);
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V tr = twp[0], ti = twp[1];
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return VFMA(tr, sr, VMUL(ti, si));
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}
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static inline V BYTWJ2(const R *t, V sr)
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{
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const V *twp = (const V *)t;
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V si = FLIP_RI(sr);
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V tr = twp[0], ti = twp[1];
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return VFNMS(ti, si, VMUL(tr, sr));
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}
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/* twiddle storage #3 */
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#define VTW3 VTW1
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#define TWVL3 TWVL1
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/* twiddle storage for split arrays */
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#ifdef FFTW_SINGLE
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# define VTWS(v,x) \
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{TW_COS, v, x}, {TW_COS, v+1, x}, {TW_COS, v+2, x}, {TW_COS, v+3, x}, \
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{TW_COS, v+4, x}, {TW_COS, v+5, x}, {TW_COS, v+6, x}, {TW_COS, v+7, x}, \
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{TW_SIN, v, x}, {TW_SIN, v+1, x}, {TW_SIN, v+2, x}, {TW_SIN, v+3, x}, \
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{TW_SIN, v+4, x}, {TW_SIN, v+5, x}, {TW_SIN, v+6, x}, {TW_SIN, v+7, x}
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#else
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# define VTWS(v,x) \
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{TW_COS, v, x}, {TW_COS, v+1, x}, {TW_COS, v+2, x}, {TW_COS, v+3, x}, \
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{TW_SIN, v, x}, {TW_SIN, v+1, x}, {TW_SIN, v+2, x}, {TW_SIN, v+3, x}
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#endif
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#define TWVLS (2 * VL)
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#define VLEAVE() /* nothing */
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#include "simd-common.h"
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