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-rw-r--r--code/libspeex/filters_arm4.h96
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diff --git a/code/libspeex/filters_arm4.h b/code/libspeex/filters_arm4.h
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+/* 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;
+}
+