| /* 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" |
| |
| "\tbgt .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; |
| } |
| |