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