1/* Copyright (C) 2005 Analog Devices
2   Author: Jean-Marc Valin */
3/**
4   @file fixed_bfin.h
5   @brief Blackfin fixed-point operations
6*/
7/*
8   Redistribution and use in source and binary forms, with or without
9   modification, are permitted provided that the following conditions
10   are met:
11
12   - Redistributions of source code must retain the above copyright
13   notice, this list of conditions and the following disclaimer.
14
15   - Redistributions in binary form must reproduce the above copyright
16   notice, this list of conditions and the following disclaimer in the
17   documentation and/or other materials provided with the distribution.
18
19   - Neither the name of the Xiph.org Foundation nor the names of its
20   contributors may be used to endorse or promote products derived from
21   this software without specific prior written permission.
22
23   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
24   ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
25   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
26   A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
27   CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
28   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
29   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
30   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34*/
35
36#ifndef FIXED_BFIN_H
37#define FIXED_BFIN_H
38
39#undef PDIV32_16
40static inline spx_word16_t PDIV32_16(spx_word32_t a, spx_word16_t b)
41{
42   spx_word32_t res, bb;
43   bb = b;
44   a += b>>1;
45   __asm__  (
46         "P0 = 15;\n\t"
47         "R0 = %1;\n\t"
48         "R1 = %2;\n\t"
49         //"R0 = R0 + R1;\n\t"
50         "R0 <<= 1;\n\t"
51         "DIVS (R0, R1);\n\t"
52         "LOOP divide%= LC0 = P0;\n\t"
53         "LOOP_BEGIN divide%=;\n\t"
54            "DIVQ (R0, R1);\n\t"
55         "LOOP_END divide%=;\n\t"
56         "R0 = R0.L;\n\t"
57         "%0 = R0;\n\t"
58   : "=m" (res)
59   : "m" (a), "m" (bb)
60   : "P0", "R0", "R1", "cc");
61   return res;
62}
63
64#undef DIV32_16
65static inline spx_word16_t DIV32_16(spx_word32_t a, spx_word16_t b)
66{
67   spx_word32_t res, bb;
68   bb = b;
69   /* Make the roundinf consistent with the C version
70      (do we need to do that?)*/
71   if (a<0)
72      a += (b-1);
73   __asm__  (
74         "P0 = 15;\n\t"
75         "R0 = %1;\n\t"
76         "R1 = %2;\n\t"
77         "R0 <<= 1;\n\t"
78         "DIVS (R0, R1);\n\t"
79         "LOOP divide%= LC0 = P0;\n\t"
80         "LOOP_BEGIN divide%=;\n\t"
81            "DIVQ (R0, R1);\n\t"
82         "LOOP_END divide%=;\n\t"
83         "R0 = R0.L;\n\t"
84         "%0 = R0;\n\t"
85   : "=m" (res)
86   : "m" (a), "m" (bb)
87   : "P0", "R0", "R1", "cc");
88   return res;
89}
90
91#undef MAX16
92static inline spx_word16_t MAX16(spx_word16_t a, spx_word16_t b)
93{
94   spx_word32_t res;
95   __asm__  (
96         "%1 = %1.L (X);\n\t"
97         "%2 = %2.L (X);\n\t"
98         "%0 = MAX(%1,%2);"
99   : "=d" (res)
100   : "%d" (a), "d" (b)
101   );
102   return res;
103}
104
105#undef MULT16_32_Q15
106static inline spx_word32_t MULT16_32_Q15(spx_word16_t a, spx_word32_t b)
107{
108   spx_word32_t res;
109   __asm__
110   (
111         "A1 = %2.L*%1.L (M);\n\t"
112         "A1 = A1 >>> 15;\n\t"
113         "%0 = (A1 += %2.L*%1.H) ;\n\t"
114   : "=&W" (res), "=&d" (b)
115   : "d" (a), "1" (b)
116   : "A1"
117   );
118   return res;
119}
120
121#undef MAC16_32_Q15
122static inline spx_word32_t MAC16_32_Q15(spx_word32_t c, spx_word16_t a, spx_word32_t b)
123{
124   spx_word32_t res;
125   __asm__
126         (
127         "A1 = %2.L*%1.L (M);\n\t"
128         "A1 = A1 >>> 15;\n\t"
129         "%0 = (A1 += %2.L*%1.H);\n\t"
130         "%0 = %0 + %4;\n\t"
131   : "=&W" (res), "=&d" (b)
132   : "d" (a), "1" (b), "d" (c)
133   : "A1"
134         );
135   return res;
136}
137
138#undef MULT16_32_Q14
139static inline spx_word32_t MULT16_32_Q14(spx_word16_t a, spx_word32_t b)
140{
141   spx_word32_t res;
142   __asm__
143         (
144         "%2 <<= 1;\n\t"
145         "A1 = %1.L*%2.L (M);\n\t"
146         "A1 = A1 >>> 15;\n\t"
147         "%0 = (A1 += %1.L*%2.H);\n\t"
148   : "=W" (res), "=d" (a), "=d" (b)
149   : "1" (a), "2" (b)
150   : "A1"
151         );
152   return res;
153}
154
155#undef MAC16_32_Q14
156static inline spx_word32_t MAC16_32_Q14(spx_word32_t c, spx_word16_t a, spx_word32_t b)
157{
158   spx_word32_t res;
159   __asm__
160         (
161         "%1 <<= 1;\n\t"
162         "A1 = %2.L*%1.L (M);\n\t"
163         "A1 = A1 >>> 15;\n\t"
164         "%0 = (A1 += %2.L*%1.H);\n\t"
165         "%0 = %0 + %4;\n\t"
166   : "=&W" (res), "=&d" (b)
167   : "d" (a), "1" (b), "d" (c)
168   : "A1"
169         );
170   return res;
171}
172
173#endif
174