| The Android Open Source Project | 98913fe | 2009-03-15 16:47:32 -0700 | [diff] [blame] | 1 | /* Copyright (C) 2006 David Rowe */ |
| 2 | /** |
| 3 | @file lsp_bfin.h |
| 4 | @author David Rowe |
| 5 | @brief LSP routines optimised for the Blackfin |
| 6 | */ |
| 7 | /* |
| 8 | Redistribution and use in source and binary forms, with or without |
| 9 | modification, are permitted provided that the following conditions |
| 10 | are met: |
| 11 | |
| 12 | - Redistributions of source code must retain the above copyright |
| 13 | notice, this list of conditions and the following disclaimer. |
| 14 | |
| 15 | - Redistributions in binary form must reproduce the above copyright |
| 16 | notice, this list of conditions and the following disclaimer in the |
| 17 | documentation and/or other materials provided with the distribution. |
| 18 | |
| 19 | - Neither the name of the Xiph.org Foundation nor the names of its |
| 20 | contributors may be used to endorse or promote products derived from |
| 21 | this software without specific prior written permission. |
| 22 | |
| 23 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 24 | ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 25 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 26 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR |
| 27 | CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| 28 | EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 29 | PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| 30 | PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| 31 | LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 32 | NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 33 | SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 34 | */ |
| 35 | |
| 36 | #define OVERRIDE_CHEB_POLY_EVA |
| 37 | #ifdef OVERRIDE_CHEB_POLY_EVA |
| 38 | static inline spx_word32_t cheb_poly_eva( |
| 39 | spx_word16_t *coef, /* P or Q coefs in Q13 format */ |
| 40 | spx_word16_t x, /* cos of freq (-1.0 to 1.0) in Q14 format */ |
| 41 | int m, /* LPC order/2 */ |
| 42 | char *stack |
| 43 | ) |
| 44 | { |
| 45 | spx_word32_t sum; |
| 46 | |
| 47 | __asm__ __volatile__ |
| 48 | ( |
| 49 | "P0 = %2;\n\t" /* P0: coef[m], coef[m-1],..., coef[0] */ |
| 50 | "R4 = 8192;\n\t" /* R4: rounding constant */ |
| 51 | "R2 = %1;\n\t" /* R2: x */ |
| 52 | |
| 53 | "R5 = -16383;\n\t" |
| 54 | "R2 = MAX(R2,R5);\n\t" |
| 55 | "R5 = 16383;\n\t" |
| 56 | "R2 = MIN(R2,R5);\n\t" |
| 57 | |
| 58 | "R3 = W[P0--] (X);\n\t" /* R3: sum */ |
| 59 | "R5 = W[P0--] (X);\n\t" |
| 60 | "R5 = R5.L * R2.L (IS);\n\t" |
| 61 | "R5 = R5 + R4;\n\t" |
| 62 | "R5 >>>= 14;\n\t" |
| 63 | "R3 = R3 + R5;\n\t" |
| 64 | |
| 65 | "R0 = R2;\n\t" /* R0: b0 */ |
| 66 | "R1 = 16384;\n\t" /* R1: b1 */ |
| 67 | "LOOP cpe%= LC0 = %3;\n\t" |
| 68 | "LOOP_BEGIN cpe%=;\n\t" |
| 69 | "P1 = R0;\n\t" |
| 70 | "R0 = R2.L * R0.L (IS) || R5 = W[P0--] (X);\n\t" |
| 71 | "R0 >>>= 13;\n\t" |
| 72 | "R0 = R0 - R1;\n\t" |
| 73 | "R1 = P1;\n\t" |
| 74 | "R5 = R5.L * R0.L (IS);\n\t" |
| 75 | "R5 = R5 + R4;\n\t" |
| 76 | "R5 >>>= 14;\n\t" |
| 77 | "R3 = R3 + R5;\n\t" |
| 78 | "LOOP_END cpe%=;\n\t" |
| 79 | "%0 = R3;\n\t" |
| 80 | : "=&d" (sum) |
| 81 | : "a" (x), "a" (&coef[m]), "a" (m-1) |
| 82 | : "R0", "R1", "R3", "R2", "R4", "R5", "P0", "P1" |
| 83 | ); |
| 84 | return sum; |
| 85 | } |
| 86 | #endif |
| 87 | |
| 88 | |
| 89 | |