97 lines
3.2 KiB
C
97 lines
3.2 KiB
C
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/* Copyright (C) 2004 Jean-Marc Valin */
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/**
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@file filters_arm4.h
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@brief Various analysis/synthesis filters (ARM4 version)
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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_NORMALIZE16
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int normalize16(const spx_sig_t *x, spx_word16_t *y, spx_sig_t max_scale, int len)
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{
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spx_sig_t max_val=1;
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int sig_shift;
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int dead1, dead2, dead3, dead4, dead5, dead6;
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__asm__ __volatile__ (
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"\tmov %1, #1 \n"
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"\tmov %3, #0 \n"
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".normalize16loop1%=: \n"
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"\tldr %4, [%0], #4 \n"
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"\tcmps %4, %1 \n"
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"\tmovgt %1, %4 \n"
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"\tcmps %4, %3 \n"
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"\tmovlt %3, %4 \n"
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"\tsubs %2, %2, #1 \n"
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"\tbne .normalize16loop1%=\n"
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"\trsb %3, %3, #0 \n"
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"\tcmp %1, %3 \n"
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"\tmovlt %1, %3 \n"
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: "=r" (dead1), "=r" (max_val), "=r" (dead3), "=r" (dead4),
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"=r" (dead5), "=r" (dead6)
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: "0" (x), "2" (len)
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: "cc");
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sig_shift=0;
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while (max_val>max_scale)
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{
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sig_shift++;
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max_val >>= 1;
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}
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__asm__ __volatile__ (
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".normalize16loop%=: \n"
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"\tldr %4, [%0], #4 \n"
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"\tldr %5, [%0], #4 \n"
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"\tmov %4, %4, asr %3 \n"
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"\tstrh %4, [%1], #2 \n"
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"\tldr %4, [%0], #4 \n"
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"\tmov %5, %5, asr %3 \n"
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"\tstrh %5, [%1], #2 \n"
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"\tldr %5, [%0], #4 \n"
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"\tmov %4, %4, asr %3 \n"
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"\tstrh %4, [%1], #2 \n"
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"\tsubs %2, %2, #1 \n"
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"\tmov %5, %5, asr %3 \n"
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"\tstrh %5, [%1], #2 \n"
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"\tbgt .normalize16loop%=\n"
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: "=r" (dead1), "=r" (dead2), "=r" (dead3), "=r" (dead4),
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"=r" (dead5), "=r" (dead6)
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: "0" (x), "1" (y), "2" (len>>2), "3" (sig_shift)
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: "cc", "memory");
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return sig_shift;
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}
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