ebc58c9f06
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@12241 a1c6a512-1295-4272-9138-f99709370657
89 lines
3.1 KiB
C
89 lines
3.1 KiB
C
/* Copyright (C) 2006 David Rowe */
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/**
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@file lsp_bfin.h
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@author David Rowe
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@brief LSP routines optimised for the Blackfin
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*/
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/*
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of the Xiph.org Foundation nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#define OVERRIDE_CHEB_POLY_EVA
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#ifdef OVERRIDE_CHEB_POLY_EVA
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static inline spx_word32_t cheb_poly_eva(
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spx_word16_t *coef, /* P or Q coefs in Q13 format */
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spx_word16_t x, /* cos of freq (-1.0 to 1.0) in Q14 format */
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int m, /* LPC order/2 */
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char *stack
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)
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{
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spx_word32_t sum;
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__asm__ __volatile__
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(
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"P0 = %2;\n\t" /* P0: coef[m], coef[m-1],..., coef[0] */
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"R4 = 8192;\n\t" /* R4: rounding constant */
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"R2 = %1;\n\t" /* R2: x */
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"R5 = -16383;\n\t"
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"R2 = MAX(R2,R5);\n\t"
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"R5 = 16383;\n\t"
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"R2 = MIN(R2,R5);\n\t"
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"R3 = W[P0--] (X);\n\t" /* R3: sum */
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"R5 = W[P0--] (X);\n\t"
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"R5 = R5.L * R2.L (IS);\n\t"
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"R5 = R5 + R4;\n\t"
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"R5 >>>= 14;\n\t"
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"R3 = R3 + R5;\n\t"
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"R0 = R2;\n\t" /* R0: b0 */
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"R1 = 16384;\n\t" /* R1: b1 */
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"LOOP cpe%= LC0 = %3;\n\t"
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"LOOP_BEGIN cpe%=;\n\t"
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"P1 = R0;\n\t"
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"R0 = R2.L * R0.L (IS) || R5 = W[P0--] (X);\n\t"
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"R0 >>>= 13;\n\t"
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"R0 = R0 - R1;\n\t"
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"R1 = P1;\n\t"
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"R5 = R5.L * R0.L (IS);\n\t"
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"R5 = R5 + R4;\n\t"
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"R5 >>>= 14;\n\t"
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"R3 = R3 + R5;\n\t"
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"LOOP_END cpe%=;\n\t"
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"%0 = R3;\n\t"
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: "=&d" (sum)
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: "a" (x), "a" (&coef[m]), "a" (m-1)
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: "R0", "R1", "R3", "R2", "R4", "R5", "P0", "P1"
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);
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return sum;
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}
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#endif
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