fixed_bfin.h
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上传日期:2014-04-03
资源大小:7248k
文件大小:4k
源码类别:
Windows CE
开发平台:
C/C++
- /* 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 DIV32_16
- static inline spx_word16_t DIV32_16(spx_word32_t a, spx_word16_t b)
- {
- spx_word32_t res, bb;
- bb = b;
- __asm__ (
- "P0 = 15;nt"
- "R0 = %1;nt"
- "R1 = %2;nt"
- "R0 <<= 1;nt"
- "DIVS (R0, R1);nt"
- "LOOP divide%= LC0 = P0;nt"
- "LOOP_BEGIN divide%=;nt"
- "DIVQ (R0, R1);nt"
- "LOOP_END divide%=;nt"
- "R0 = R0.L;nt"
- "%0 = R0;nt"
- : "=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);nt"
- "%2 = %2.L (X);nt"
- "%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__
- (
- "%1 <<= 1;nt"
- "A1 = %2.L*%1.L (M,IS);nt"
- "A1 = A1 >>> 16;nt"
- "R1 = (A1 += %2.L*%1.H) (IS);nt"
- "%0 = R1;nt"
- : "=&d" (res), "=&d" (b)
- : "d" (a), "1" (b)
- : "A1", "R1"
- );
- 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__
- (
- "%1 <<= 1;nt"
- "A1 = %2.L*%1.L (M,IS);nt"
- "A1 = A1 >>> 16;nt"
- "R1 = (A1 += %2.L*%1.H) (IS);nt"
- "%0 = R1 + %4;nt"
- : "=&d" (res), "=&d" (b)
- : "d" (a), "1" (b), "d" (c)
- : "A1", "R1"
- );
- 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 <<= 2;nt"
- "A1 = %1.L*%2.L (M,IS);nt"
- "A1 = A1 >>> 16;nt"
- "R1 = (A1 += %1.L*%2.H) (IS);nt"
- "%0 = R1;nt"
- : "=d" (res), "=d" (a), "=d" (b)
- : "1" (a), "2" (b)
- : "A1", "R1"
- );
- 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 <<= 2;nt"
- "A1 = %2.L*%1.L (M,IS);nt"
- "A1 = A1 >>> 16;nt"
- "R1 = (A1 += %2.L*%1.H) (IS);nt"
- "%0 = R1 + %4;nt"
- : "=&d" (res), "=&d" (b)
- : "d" (a), "1" (b), "d" (c)
- : "A1", "R1"
- );
- return res;
- }
- #endif