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116 lines
3.9 KiB
C
116 lines
3.9 KiB
C
/* Copyright (C) 2004 Jean-Marc Valin */
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/**
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@file vq_arm4.h
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@brief ARM4-optimized vq routine
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*/
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/*
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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
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are met:
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- 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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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of the Xiph.org Foundation nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#define OVERRIDE_VQ_NBEST
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void vq_nbest(spx_word16_t *in, const spx_word16_t *codebook, int len, int entries, spx_word32_t *E, int N, int *nbest, spx_word32_t *best_dist, char *stack)
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{
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int i,j;
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for (i=0;i<entries;i+=4)
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{
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#if 1
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spx_word32_t dist1, dist2, dist3, dist4;
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int dead1, dead2, dead3, dead4, dead5, dead6, dead7, dead8;
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__asm__ __volatile__ (
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"mov %0, #0 \n\t"
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"mov %1, #0 \n\t"
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"mov %2, #0 \n\t"
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"mov %3, #0 \n\t"
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"mov %10, %4 \n\t"
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"add %4, %4, %4\n\t"
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".vqloop%=:\n\t"
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"ldrsh %7, [%5], #2 \n\t"
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"ldrsh %8, [%6] \n\t"
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"mov %9, %6 \n\t"
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"mla %0, %7, %8, %0 \n\t"
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"ldrsh %8, [%9, %4]! \n\t"
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"mla %1, %7, %8, %1 \n\t"
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"ldrsh %8, [%9, %4]!\n\t"
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"mla %2, %7, %8, %2 \n\t"
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"ldrsh %8, [%9, %4]! \n\t"
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"mla %3, %7, %8, %3 \n\t"
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"subs %10, %10, #1 \n\t"
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"add %6, %6, #2 \n\t"
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"bne .vqloop%="
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: "=r" (dist1), "=r" (dist2), "=r" (dist3), "=r" (dist4),
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"=r" (dead1), "=r" (dead2), "=r" (codebook), "=r" (dead4),
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"=r" (dead5), "=r" (dead6), "=r" (dead7)
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: "4" (len), "5" (in), "6" (codebook)
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: "cc");
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#else
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dist1=dist2=dist3=dist4=0;
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/* spx_word32_t dist1=0;
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spx_word32_t dist2=0;
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spx_word32_t dist3=0;
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spx_word32_t dist4=0;*/
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for (j=0;j<2;j++)
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{
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const spx_word16_t *code = codebook;
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dist1 = MAC16_16(dist1,in[j],*code);
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code += len;
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dist2 = MAC16_16(dist2,in[j],*code);
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code += len;
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dist3 = MAC16_16(dist3,in[j],*code);
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code += len;
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dist4 = MAC16_16(dist4,in[j],*code);
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codebook++;
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}
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#endif
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dist1=SUB32(SHR(*E++,1),dist1);
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if (dist1<*best_dist || i==0)
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{
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*best_dist=dist1;
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*nbest=i;
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}
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dist2=SUB32(SHR(*E++,1),dist2);
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if (dist2<*best_dist)
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{
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*best_dist=dist2;
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*nbest=i+1;
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}
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dist3=SUB32(SHR(*E++,1),dist3);
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if (dist3<*best_dist)
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{
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*best_dist=dist3;
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*nbest=i+2;
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}
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dist4=SUB32(SHR(*E++,1),dist4);
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if (dist4<*best_dist)
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{
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*best_dist=dist4;
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*nbest=i+3;
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}
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codebook += 3*len;
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}
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}
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