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DuerOS-Light-SDK-v1.1.0/duer-os-light/external/speex/libspeex/filters_arm4.h@47:9e361da97763, 2017-07-18 (annotated)

Committer:
TMBOY
Date:
Tue Jul 18 16:54:45 2017 +0800
Revision:
47:9e361da97763
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Who changed what in which revision?

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TMBOY 47:9e361da97763 1 /* Copyright (C) 2004 Jean-Marc Valin */
TMBOY 47:9e361da97763 2 /**
TMBOY 47:9e361da97763 3 @file filters_arm4.h
TMBOY 47:9e361da97763 4 @brief Various analysis/synthesis filters (ARM4 version)
TMBOY 47:9e361da97763 5 */
TMBOY 47:9e361da97763 6 /*
TMBOY 47:9e361da97763 7 Redistribution and use in source and binary forms, with or without
TMBOY 47:9e361da97763 8 modification, are permitted provided that the following conditions
TMBOY 47:9e361da97763 9 are met:
TMBOY 47:9e361da97763 10
TMBOY 47:9e361da97763 11 - Redistributions of source code must retain the above copyright
TMBOY 47:9e361da97763 12 notice, this list of conditions and the following disclaimer.
TMBOY 47:9e361da97763 13
TMBOY 47:9e361da97763 14 - Redistributions in binary form must reproduce the above copyright
TMBOY 47:9e361da97763 15 notice, this list of conditions and the following disclaimer in the
TMBOY 47:9e361da97763 16 documentation and/or other materials provided with the distribution.
TMBOY 47:9e361da97763 17
TMBOY 47:9e361da97763 18 - Neither the name of the Xiph.org Foundation nor the names of its
TMBOY 47:9e361da97763 19 contributors may be used to endorse or promote products derived from
TMBOY 47:9e361da97763 20 this software without specific prior written permission.
TMBOY 47:9e361da97763 21
TMBOY 47:9e361da97763 22 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
TMBOY 47:9e361da97763 23 ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
TMBOY 47:9e361da97763 24 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
TMBOY 47:9e361da97763 25 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
TMBOY 47:9e361da97763 26 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
TMBOY 47:9e361da97763 27 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
TMBOY 47:9e361da97763 28 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
TMBOY 47:9e361da97763 29 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
TMBOY 47:9e361da97763 30 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
TMBOY 47:9e361da97763 31 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
TMBOY 47:9e361da97763 32 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
TMBOY 47:9e361da97763 33 */
TMBOY 47:9e361da97763 34
TMBOY 47:9e361da97763 35 #define OVERRIDE_NORMALIZE16
TMBOY 47:9e361da97763 36 int normalize16(const spx_sig_t *x, spx_word16_t *y, spx_sig_t max_scale, int len)
TMBOY 47:9e361da97763 37 {
TMBOY 47:9e361da97763 38 spx_sig_t max_val=1;
TMBOY 47:9e361da97763 39 int sig_shift;
TMBOY 47:9e361da97763 40 int dead1, dead2, dead3, dead4, dead5, dead6;
TMBOY 47:9e361da97763 41
TMBOY 47:9e361da97763 42 __asm__ __volatile__ (
TMBOY 47:9e361da97763 43 "\tmov %1, #1 \n"
TMBOY 47:9e361da97763 44 "\tmov %3, #0 \n"
TMBOY 47:9e361da97763 45
TMBOY 47:9e361da97763 46 ".normalize16loop1%=: \n"
TMBOY 47:9e361da97763 47
TMBOY 47:9e361da97763 48 "\tldr %4, [%0], #4 \n"
TMBOY 47:9e361da97763 49 "\tcmps %4, %1 \n"
TMBOY 47:9e361da97763 50 "\tmovgt %1, %4 \n"
TMBOY 47:9e361da97763 51 "\tcmps %4, %3 \n"
TMBOY 47:9e361da97763 52 "\tmovlt %3, %4 \n"
TMBOY 47:9e361da97763 53
TMBOY 47:9e361da97763 54 "\tsubs %2, %2, #1 \n"
TMBOY 47:9e361da97763 55 "\tbne .normalize16loop1%=\n"
TMBOY 47:9e361da97763 56
TMBOY 47:9e361da97763 57 "\trsb %3, %3, #0 \n"
TMBOY 47:9e361da97763 58 "\tcmp %1, %3 \n"
TMBOY 47:9e361da97763 59 "\tmovlt %1, %3 \n"
TMBOY 47:9e361da97763 60 : "=r" (dead1), "=r" (max_val), "=r" (dead3), "=r" (dead4),
TMBOY 47:9e361da97763 61 "=r" (dead5), "=r" (dead6)
TMBOY 47:9e361da97763 62 : "0" (x), "2" (len)
TMBOY 47:9e361da97763 63 : "cc");
TMBOY 47:9e361da97763 64
TMBOY 47:9e361da97763 65 sig_shift=0;
TMBOY 47:9e361da97763 66 while (max_val>max_scale)
TMBOY 47:9e361da97763 67 {
TMBOY 47:9e361da97763 68 sig_shift++;
TMBOY 47:9e361da97763 69 max_val >>= 1;
TMBOY 47:9e361da97763 70 }
TMBOY 47:9e361da97763 71
TMBOY 47:9e361da97763 72 __asm__ __volatile__ (
TMBOY 47:9e361da97763 73 ".normalize16loop%=: \n"
TMBOY 47:9e361da97763 74
TMBOY 47:9e361da97763 75 "\tldr %4, [%0], #4 \n"
TMBOY 47:9e361da97763 76 "\tldr %5, [%0], #4 \n"
TMBOY 47:9e361da97763 77 "\tmov %4, %4, asr %3 \n"
TMBOY 47:9e361da97763 78 "\tstrh %4, [%1], #2 \n"
TMBOY 47:9e361da97763 79 "\tldr %4, [%0], #4 \n"
TMBOY 47:9e361da97763 80 "\tmov %5, %5, asr %3 \n"
TMBOY 47:9e361da97763 81 "\tstrh %5, [%1], #2 \n"
TMBOY 47:9e361da97763 82 "\tldr %5, [%0], #4 \n"
TMBOY 47:9e361da97763 83 "\tmov %4, %4, asr %3 \n"
TMBOY 47:9e361da97763 84 "\tstrh %4, [%1], #2 \n"
TMBOY 47:9e361da97763 85 "\tsubs %2, %2, #1 \n"
TMBOY 47:9e361da97763 86 "\tmov %5, %5, asr %3 \n"
TMBOY 47:9e361da97763 87 "\tstrh %5, [%1], #2 \n"
TMBOY 47:9e361da97763 88
TMBOY 47:9e361da97763 89 "\tbge .normalize16loop%=\n"
TMBOY 47:9e361da97763 90 : "=r" (dead1), "=r" (dead2), "=r" (dead3), "=r" (dead4),
TMBOY 47:9e361da97763 91 "=r" (dead5), "=r" (dead6)
TMBOY 47:9e361da97763 92 : "0" (x), "1" (y), "2" (len>>2), "3" (sig_shift)
TMBOY 47:9e361da97763 93 : "cc", "memory");
TMBOY 47:9e361da97763 94 return sig_shift;
TMBOY 47:9e361da97763 95 }
TMBOY 47:9e361da97763 96