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lsp_bfin.h
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00001 /* Copyright (C) 2006 David Rowe */ 00002 /** 00003 @file lsp_bfin.h 00004 @author David Rowe 00005 @brief LSP routines optimised for the Blackfin 00006 */ 00007 /* 00008 Redistribution and use in source and binary forms, with or without 00009 modification, are permitted provided that the following conditions 00010 are met: 00011 00012 - Redistributions of source code must retain the above copyright 00013 notice, this list of conditions and the following disclaimer. 00014 00015 - Redistributions in binary form must reproduce the above copyright 00016 notice, this list of conditions and the following disclaimer in the 00017 documentation and/or other materials provided with the distribution. 00018 00019 - Neither the name of the Xiph.org Foundation nor the names of its 00020 contributors may be used to endorse or promote products derived from 00021 this software without specific prior written permission. 00022 00023 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 00024 ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 00025 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 00026 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR 00027 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 00028 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 00029 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 00030 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 00031 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 00032 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 00033 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00034 */ 00035 00036 #define OVERRIDE_CHEB_POLY_EVA 00037 #ifdef OVERRIDE_CHEB_POLY_EVA 00038 static inline spx_word32_t cheb_poly_eva( 00039 spx_word16_t *coef, /* P or Q coefs in Q13 format */ 00040 spx_word16_t x, /* cos of freq (-1.0 to 1.0) in Q14 format */ 00041 int m, /* LPC order/2 */ 00042 char *stack 00043 ) 00044 { 00045 spx_word32_t sum; 00046 00047 __asm__ __volatile__ 00048 ( 00049 "P0 = %2;\n\t" /* P0: coef[m], coef[m-1],..., coef[0] */ 00050 "R4 = 8192;\n\t" /* R4: rounding constant */ 00051 "R2 = %1;\n\t" /* R2: x */ 00052 00053 "R5 = -16383;\n\t" 00054 "R2 = MAX(R2,R5);\n\t" 00055 "R5 = 16383;\n\t" 00056 "R2 = MIN(R2,R5);\n\t" 00057 00058 "R3 = W[P0--] (X);\n\t" /* R3: sum */ 00059 "R5 = W[P0--] (X);\n\t" 00060 "R5 = R5.L * R2.L (IS);\n\t" 00061 "R5 = R5 + R4;\n\t" 00062 "R5 >>>= 14;\n\t" 00063 "R3 = R3 + R5;\n\t" 00064 00065 "R0 = R2;\n\t" /* R0: b0 */ 00066 "R1 = 16384;\n\t" /* R1: b1 */ 00067 "LOOP cpe%= LC0 = %3;\n\t" 00068 "LOOP_BEGIN cpe%=;\n\t" 00069 "P1 = R0;\n\t" 00070 "R0 = R2.L * R0.L (IS) || R5 = W[P0--] (X);\n\t" 00071 "R0 >>>= 13;\n\t" 00072 "R0 = R0 - R1;\n\t" 00073 "R1 = P1;\n\t" 00074 "R5 = R5.L * R0.L (IS);\n\t" 00075 "R5 = R5 + R4;\n\t" 00076 "R5 >>>= 14;\n\t" 00077 "R3 = R3 + R5;\n\t" 00078 "LOOP_END cpe%=;\n\t" 00079 "%0 = R3;\n\t" 00080 : "=&d" (sum) 00081 : "a" (x), "a" (&coef[m]), "a" (m-1) 00082 : "R0", "R1", "R3", "R2", "R4", "R5", "P0", "P1" 00083 ); 00084 return sum; 00085 } 00086 #endif 00087 00088 00089
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