120 lines
3.2 KiB
C
120 lines
3.2 KiB
C
/***************************************************************************
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Copyright (c) 2014, The OpenBLAS Project
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the
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distribution.
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3. Neither the name of the OpenBLAS project nor the names of
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its contributors may be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBLAS PROJECT OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*****************************************************************************/
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#include "common.h"
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#include <arm_neon.h>
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#define prefetch(a) __asm__("prfm PLDL1STRM, [%0]"::"r"(a):"memory");
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FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y)
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{
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BLASLONG i=0;
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BLASLONG ix=0,iy=0;
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FLOAT dot = 0.0 ;
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if ( n < 0 ) return(dot);
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if ( (inc_x == 1) && (inc_y == 1) )
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{
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float64x2_t vdot0 = {0.0, 0.0};
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float64x2_t vdot1 = {0.0, 0.0};
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float64x2_t vdot2 = {0.0, 0.0};
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float64x2_t vdot3 = {0.0, 0.0};
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float64x2_t *vx = (float64x2_t*)x;
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float64x2_t *vy = (float64x2_t*)y;
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#if 0
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prefetch(x + 128/sizeof(*x));
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prefetch(y + 128/sizeof(*y));
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#endif
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prefetch(x + 2*128/sizeof(*x));
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prefetch(y + 2*128/sizeof(*y));
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prefetch(x + 3*128/sizeof(*x));
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prefetch(y + 3*128/sizeof(*y));
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int n1 = n&-8;
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while(i < n1)
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{
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#if 0
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vdot0 = vfmaq_f64 (vdot0,
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vy[0],
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vx[0]);
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vdot1 = vfmaq_f64 (vdot1,
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vy[1],
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vx[1]);
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vdot2 = vfmaq_f64 (vdot2,
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vy[2],
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vx[2]);
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vdot3 = vfmaq_f64 (vdot3,
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vy[3],
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vx[3]);
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#else
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vdot0 = vy[0] * vx[0] + vdot0;
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vdot1 = vy[1] * vx[1] + vdot1;
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vdot2 = vy[2] * vx[2] + vdot2;
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vdot3 = vy[3] * vx[3] + vdot3;
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#endif
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vy += 4;
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vx += 4;
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i += 8;
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prefetch(vx + 3*128/sizeof(*x));
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prefetch(vy + 3*128/sizeof(*y));
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}
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dot = vaddvq_f64 (vdot0 + vdot1);
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dot += vaddvq_f64 (vdot2 + vdot3);
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i = n1;
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while(i < n)
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{
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dot += y[i] * x[i] ;
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i++ ;
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}
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return(dot);
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}
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while(i < n)
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{
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dot += y[iy] * x[ix] ;
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ix += inc_x ;
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iy += inc_y ;
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i++ ;
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}
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return(dot);
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}
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