Diff: DuerOS-Light-SDK-v1.1.0/duer-os-light/external/speex/libspeex/filters_arm4.h

Revision:

47:9e361da97763

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DuerOS-Light-SDK-v1.1.0/duer-os-light/external/speex/libspeex/filters_arm4.h	Tue Jul 18 16:54:45 2017 +0800
@@ -0,0 +1,96 @@
+/* Copyright (C) 2004 Jean-Marc Valin */
+/**
+   @file filters_arm4.h
+   @brief Various analysis/synthesis filters (ARM4 version)
+*/
+/*
+   Redistribution and use in source and binary forms, with or without
+   modification, are permitted provided that the following conditions
+   are met:
+   
+   - Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+   
+   - Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+   
+   - Neither the name of the Xiph.org Foundation nor the names of its
+   contributors may be used to endorse or promote products derived from
+   this software without specific prior written permission.
+   
+   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+   ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+   A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
+   CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#define OVERRIDE_NORMALIZE16
+int normalize16(const spx_sig_t *x, spx_word16_t *y, spx_sig_t max_scale, int len)
+{
+   spx_sig_t max_val=1;
+   int sig_shift;
+   int dead1, dead2, dead3, dead4, dead5, dead6;
+
+   __asm__ __volatile__ (
+         "\tmov %1, #1 \n"
+         "\tmov %3, #0 \n"
+
+         ".normalize16loop1%=: \n"
+
+         "\tldr %4, [%0], #4 \n"
+         "\tcmps %4, %1 \n"
+         "\tmovgt %1, %4 \n"
+         "\tcmps %4, %3 \n"
+         "\tmovlt %3, %4 \n"
+
+         "\tsubs %2, %2, #1 \n"
+         "\tbne .normalize16loop1%=\n"
+
+         "\trsb %3, %3, #0 \n"
+         "\tcmp %1, %3 \n"
+         "\tmovlt %1, %3 \n"
+   : "=r" (dead1), "=r" (max_val), "=r" (dead3), "=r" (dead4),
+   "=r" (dead5), "=r" (dead6)
+   : "0" (x), "2" (len)
+   : "cc");
+
+   sig_shift=0;
+   while (max_val>max_scale)
+   {
+      sig_shift++;
+      max_val >>= 1;
+   }
+   
+   __asm__ __volatile__ (
+         ".normalize16loop%=: \n"
+
+         "\tldr %4, [%0], #4 \n"
+         "\tldr %5, [%0], #4 \n"
+         "\tmov %4, %4, asr %3 \n"
+         "\tstrh %4, [%1], #2 \n"
+         "\tldr %4, [%0], #4 \n"
+         "\tmov %5, %5, asr %3 \n"
+         "\tstrh %5, [%1], #2 \n"
+         "\tldr %5, [%0], #4 \n"
+         "\tmov %4, %4, asr %3 \n"
+         "\tstrh %4, [%1], #2 \n"
+         "\tsubs %2, %2, #1 \n"
+         "\tmov %5, %5, asr %3 \n"
+         "\tstrh %5, [%1], #2 \n"
+
+         "\tbge .normalize16loop%=\n"
+   : "=r" (dead1), "=r" (dead2), "=r" (dead3), "=r" (dead4),
+   "=r" (dead5), "=r" (dead6)
+   : "0" (x), "1" (y), "2" (len>>2), "3" (sig_shift)
+   : "cc", "memory");
+   return sig_shift;
+}
+