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174 lines
4.6 KiB
C
174 lines
4.6 KiB
C
/* Copyright (C) 2005 Analog Devices
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Author: Jean-Marc Valin */
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/**
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@file fixed_bfin.h
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@brief Blackfin fixed-point operations
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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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#ifndef FIXED_BFIN_H
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#define FIXED_BFIN_H
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#undef PDIV32_16
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static inline spx_word16_t PDIV32_16(spx_word32_t a, spx_word16_t b)
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{
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spx_word32_t res, bb;
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bb = b;
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a += b>>1;
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__asm__ (
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"P0 = 15;\n\t"
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"R0 = %1;\n\t"
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"R1 = %2;\n\t"
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//"R0 = R0 + R1;\n\t"
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"R0 <<= 1;\n\t"
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"DIVS (R0, R1);\n\t"
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"LOOP divide%= LC0 = P0;\n\t"
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"LOOP_BEGIN divide%=;\n\t"
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"DIVQ (R0, R1);\n\t"
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"LOOP_END divide%=;\n\t"
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"R0 = R0.L;\n\t"
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"%0 = R0;\n\t"
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: "=m" (res)
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: "m" (a), "m" (bb)
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: "P0", "R0", "R1", "cc");
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return res;
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}
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#undef DIV32_16
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static inline spx_word16_t DIV32_16(spx_word32_t a, spx_word16_t b)
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{
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spx_word32_t res, bb;
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bb = b;
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/* Make the roundinf consistent with the C version
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(do we need to do that?)*/
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if (a<0)
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a += (b-1);
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__asm__ (
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"P0 = 15;\n\t"
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"R0 = %1;\n\t"
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"R1 = %2;\n\t"
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"R0 <<= 1;\n\t"
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"DIVS (R0, R1);\n\t"
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"LOOP divide%= LC0 = P0;\n\t"
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"LOOP_BEGIN divide%=;\n\t"
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"DIVQ (R0, R1);\n\t"
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"LOOP_END divide%=;\n\t"
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"R0 = R0.L;\n\t"
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"%0 = R0;\n\t"
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: "=m" (res)
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: "m" (a), "m" (bb)
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: "P0", "R0", "R1", "cc");
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return res;
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}
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#undef MAX16
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static inline spx_word16_t MAX16(spx_word16_t a, spx_word16_t b)
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{
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spx_word32_t res;
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__asm__ (
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"%1 = %1.L (X);\n\t"
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"%2 = %2.L (X);\n\t"
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"%0 = MAX(%1,%2);"
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: "=d" (res)
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: "%d" (a), "d" (b)
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);
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return res;
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}
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#undef MULT16_32_Q15
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static inline spx_word32_t MULT16_32_Q15(spx_word16_t a, spx_word32_t b)
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{
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spx_word32_t res;
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__asm__
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(
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"A1 = %2.L*%1.L (M);\n\t"
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"A1 = A1 >>> 15;\n\t"
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"%0 = (A1 += %2.L*%1.H) ;\n\t"
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: "=&W" (res), "=&d" (b)
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: "d" (a), "1" (b)
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: "A1"
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);
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return res;
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}
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#undef MAC16_32_Q15
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static inline spx_word32_t MAC16_32_Q15(spx_word32_t c, spx_word16_t a, spx_word32_t b)
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{
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spx_word32_t res;
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__asm__
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(
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"A1 = %2.L*%1.L (M);\n\t"
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"A1 = A1 >>> 15;\n\t"
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"%0 = (A1 += %2.L*%1.H);\n\t"
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"%0 = %0 + %4;\n\t"
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: "=&W" (res), "=&d" (b)
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: "d" (a), "1" (b), "d" (c)
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: "A1"
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);
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return res;
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}
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#undef MULT16_32_Q14
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static inline spx_word32_t MULT16_32_Q14(spx_word16_t a, spx_word32_t b)
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{
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spx_word32_t res;
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__asm__
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(
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"%2 <<= 1;\n\t"
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"A1 = %1.L*%2.L (M);\n\t"
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"A1 = A1 >>> 15;\n\t"
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"%0 = (A1 += %1.L*%2.H);\n\t"
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: "=W" (res), "=d" (a), "=d" (b)
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: "1" (a), "2" (b)
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: "A1"
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);
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return res;
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}
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#undef MAC16_32_Q14
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static inline spx_word32_t MAC16_32_Q14(spx_word32_t c, spx_word16_t a, spx_word32_t b)
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{
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spx_word32_t res;
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__asm__
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(
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"%1 <<= 1;\n\t"
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"A1 = %2.L*%1.L (M);\n\t"
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"A1 = A1 >>> 15;\n\t"
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"%0 = (A1 += %2.L*%1.H);\n\t"
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"%0 = %0 + %4;\n\t"
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: "=&W" (res), "=&d" (b)
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: "d" (a), "1" (b), "d" (c)
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: "A1"
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);
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return res;
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}
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#endif
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