| /* Copyright (C) 2007-2008 Jean-Marc Valin |
| * Copyright (C) 2008 Thorvald Natvig |
| * Copyright (C) 2011 Jyri Sarha, Texas Instruments |
| */ |
| /** |
| @file resample_neon.h |
| @brief Resampler functions (NEON 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. |
| */ |
| |
| #include <arm_neon.h> |
| |
| /* NOTE: This code only works with following filter lengths: |
| 8 or n*16 (where n = 1,2,3...) |
| The current resampler quality presets follow the above rule. |
| */ |
| |
| #ifdef FIXED_POINT |
| #define OVERRIDE_INNER_PRODUCT_SINGLE |
| static inline int32_t inner_product_single(const int16_t *a, const int16_t *b, unsigned int len) |
| { |
| int32_t ret; |
| if (len > 8) { |
| asm volatile (" vld1.16 {d16, d17, d18, d19}, [%[a]]!\n" |
| " vld1.16 {d20, d21, d22, d23}, [%[b]]!\n" |
| " subs %[len], %[len], #16\n" |
| " vmull.s16 q0, d16, d20\n" |
| " vmlal.s16 q0, d17, d21\n" |
| " vmlal.s16 q0, d18, d22\n" |
| " vmlal.s16 q0, d19, d23\n" |
| " beq 2f\n" |
| "1:" |
| " vld1.16 {d16, d17, d18, d19}, [%[a]]!\n" |
| " vld1.16 {d20, d21, d22, d23}, [%[b]]!\n" |
| " subs %[len], %[len], #16\n" |
| " vmlal.s16 q0, d16, d20\n" |
| " vmlal.s16 q0, d17, d21\n" |
| " vmlal.s16 q0, d18, d22\n" |
| " vmlal.s16 q0, d19, d23\n" |
| " bne 1b\n" |
| "2:" |
| " vaddl.s32 q0, d0, d1\n" |
| " vadd.s64 d0, d0, d1\n" |
| " vqmovn.s64 d0, q0\n" |
| " vqrshrn.s32 d0, q0, #15\n" |
| " vmov.s16 %[ret],d0[0]\n" |
| : [ret] "=&r" (ret), [a] "+r" (a), [b] "+r" (b), |
| [len] "+r" (len) |
| : |
| : "cc", "q0", |
| "d16", "d17", "d18", "d19", |
| "d20", "d21", "d22", "d23"); |
| } |
| else { |
| asm volatile ("vld1.16 {d4, d5}, [%[a]]\n" |
| "vld1.16 {d6, d7}, [%[b]]\n" |
| "vmull.s16 q0, d4, d6\n" |
| "vmlal.s16 q0, d5, d7\n" |
| "vaddl.s32 q0, d0, d1\n" |
| "vadd.s64 d0, d0, d1\n" |
| "vqmovn.s64 d0, q0\n" |
| "vqrshrn.s32 d0, q0, #15\n" |
| "vmov.s16 %[ret],d0[0]\n" |
| : [ret] "=&r" (ret) |
| : [a] "r" (a), [b] "r" (b) |
| : "q0", "d4", "d5", "d6", "d7"); |
| } |
| return ret; |
| } |
| #endif |