| /* Copyright (C) 2006 David Rowe */ |
| /** |
| @file lsp_bfin.h |
| @author David Rowe |
| @brief LSP routines optimised for the Blackfin |
| */ |
| /* |
| 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_CHEB_POLY_EVA |
| #ifdef OVERRIDE_CHEB_POLY_EVA |
| static inline spx_word32_t cheb_poly_eva( |
| spx_word16_t *coef, /* P or Q coefs in Q13 format */ |
| spx_word16_t x, /* cos of freq (-1.0 to 1.0) in Q14 format */ |
| int m, /* LPC order/2 */ |
| char *stack |
| ) |
| { |
| spx_word32_t sum; |
| |
| __asm__ __volatile__ |
| ( |
| "P0 = %2;\n\t" /* P0: coef[m], coef[m-1],..., coef[0] */ |
| "R4 = 8192;\n\t" /* R4: rounding constant */ |
| "R2 = %1;\n\t" /* R2: x */ |
| |
| "R5 = -16383;\n\t" |
| "R2 = MAX(R2,R5);\n\t" |
| "R5 = 16383;\n\t" |
| "R2 = MIN(R2,R5);\n\t" |
| |
| "R3 = W[P0--] (X);\n\t" /* R3: sum */ |
| "R5 = W[P0--] (X);\n\t" |
| "R5 = R5.L * R2.L (IS);\n\t" |
| "R5 = R5 + R4;\n\t" |
| "R5 >>>= 14;\n\t" |
| "R3 = R3 + R5;\n\t" |
| |
| "R0 = R2;\n\t" /* R0: b0 */ |
| "R1 = 16384;\n\t" /* R1: b1 */ |
| "LOOP cpe%= LC0 = %3;\n\t" |
| "LOOP_BEGIN cpe%=;\n\t" |
| "P1 = R0;\n\t" |
| "R0 = R2.L * R0.L (IS) || R5 = W[P0--] (X);\n\t" |
| "R0 >>>= 13;\n\t" |
| "R0 = R0 - R1;\n\t" |
| "R1 = P1;\n\t" |
| "R5 = R5.L * R0.L (IS);\n\t" |
| "R5 = R5 + R4;\n\t" |
| "R5 >>>= 14;\n\t" |
| "R3 = R3 + R5;\n\t" |
| "LOOP_END cpe%=;\n\t" |
| "%0 = R3;\n\t" |
| : "=&d" (sum) |
| : "a" (x), "a" (&coef[m]), "a" (m-1) |
| : "R0", "R1", "R3", "R2", "R4", "R5", "P0", "P1" |
| ); |
| return sum; |
| } |
| #endif |
| |
| |
| |