1 /* Copyright (C) 2003 Jean-Marc Valin */
2 /**
3 @file fixed_arm5e.h
4 @brief ARM-tuned fixed-point operations
5 */
6 /*
7 Redistribution and use in source and binary forms, with or without
8 modification, are permitted provided that the following conditions
9 are met:
10
11 - Redistributions of source code must retain the above copyright
12 notice, this list of conditions and the following disclaimer.
13
14 - Redistributions in binary form must reproduce the above copyright
15 notice, this list of conditions and the following disclaimer in the
16 documentation and/or other materials provided with the distribution.
17
18 - Neither the name of the Xiph.org Foundation nor the names of its
19 contributors may be used to endorse or promote products derived from
20 this software without specific prior written permission.
21
22 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
25 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
26 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
27 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
28 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
29 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
30 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
31 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
32 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 */
34
35 #ifndef FIXED_ARM5E_H
36 #define FIXED_ARM5E_H
37
38 #undef MULT16_16
MULT16_16(spx_word16_t x,spx_word16_t y)39 static inline spx_word32_t MULT16_16(spx_word16_t x, spx_word16_t y) {
40 int res;
41 asm ("smulbb %0,%1,%2;\n"
42 : "=&r"(res)
43 : "%r"(x),"r"(y));
44 return(res);
45 }
46
47 #undef MAC16_16
MAC16_16(spx_word32_t a,spx_word16_t x,spx_word32_t y)48 static inline spx_word32_t MAC16_16(spx_word32_t a, spx_word16_t x, spx_word32_t y) {
49 int res;
50 asm ("smlabb %0,%1,%2,%3;\n"
51 : "=&r"(res)
52 : "%r"(x),"r"(y),"r"(a));
53 return(res);
54 }
55
56 #undef MULT16_32_Q15
MULT16_32_Q15(spx_word16_t x,spx_word32_t y)57 static inline spx_word32_t MULT16_32_Q15(spx_word16_t x, spx_word32_t y) {
58 int res;
59 asm ("smulwb %0,%1,%2;\n"
60 : "=&r"(res)
61 : "%r"(y<<1),"r"(x));
62 return(res);
63 }
64
65 #undef MAC16_32_Q15
MAC16_32_Q15(spx_word32_t a,spx_word16_t x,spx_word32_t y)66 static inline spx_word32_t MAC16_32_Q15(spx_word32_t a, spx_word16_t x, spx_word32_t y) {
67 int res;
68 asm ("smlawb %0,%1,%2,%3;\n"
69 : "=&r"(res)
70 : "%r"(y<<1),"r"(x),"r"(a));
71 return(res);
72 }
73
74 #undef DIV32_16
DIV32_16(int a,int b)75 static inline short DIV32_16(int a, int b)
76 {
77 int res=0;
78 int dead1, dead2, dead3, dead4, dead5;
79 __asm__ __volatile__ (
80 "\teor %5, %0, %1\n"
81 "\tmovs %4, %0\n"
82 "\trsbmi %0, %0, #0 \n"
83 "\tmovs %4, %1\n"
84 "\trsbmi %1, %1, #0 \n"
85 "\tmov %4, #1\n"
86
87 "\tsubs %3, %0, %1, asl #14 \n"
88 "\torrpl %2, %2, %4, asl #14 \n"
89 "\tmovpl %0, %3 \n"
90
91 "\tsubs %3, %0, %1, asl #13 \n"
92 "\torrpl %2, %2, %4, asl #13 \n"
93 "\tmovpl %0, %3 \n"
94
95 "\tsubs %3, %0, %1, asl #12 \n"
96 "\torrpl %2, %2, %4, asl #12 \n"
97 "\tmovpl %0, %3 \n"
98
99 "\tsubs %3, %0, %1, asl #11 \n"
100 "\torrpl %2, %2, %4, asl #11 \n"
101 "\tmovpl %0, %3 \n"
102
103 "\tsubs %3, %0, %1, asl #10 \n"
104 "\torrpl %2, %2, %4, asl #10 \n"
105 "\tmovpl %0, %3 \n"
106
107 "\tsubs %3, %0, %1, asl #9 \n"
108 "\torrpl %2, %2, %4, asl #9 \n"
109 "\tmovpl %0, %3 \n"
110
111 "\tsubs %3, %0, %1, asl #8 \n"
112 "\torrpl %2, %2, %4, asl #8 \n"
113 "\tmovpl %0, %3 \n"
114
115 "\tsubs %3, %0, %1, asl #7 \n"
116 "\torrpl %2, %2, %4, asl #7 \n"
117 "\tmovpl %0, %3 \n"
118
119 "\tsubs %3, %0, %1, asl #6 \n"
120 "\torrpl %2, %2, %4, asl #6 \n"
121 "\tmovpl %0, %3 \n"
122
123 "\tsubs %3, %0, %1, asl #5 \n"
124 "\torrpl %2, %2, %4, asl #5 \n"
125 "\tmovpl %0, %3 \n"
126
127 "\tsubs %3, %0, %1, asl #4 \n"
128 "\torrpl %2, %2, %4, asl #4 \n"
129 "\tmovpl %0, %3 \n"
130
131 "\tsubs %3, %0, %1, asl #3 \n"
132 "\torrpl %2, %2, %4, asl #3 \n"
133 "\tmovpl %0, %3 \n"
134
135 "\tsubs %3, %0, %1, asl #2 \n"
136 "\torrpl %2, %2, %4, asl #2 \n"
137 "\tmovpl %0, %3 \n"
138
139 "\tsubs %3, %0, %1, asl #1 \n"
140 "\torrpl %2, %2, %4, asl #1 \n"
141 "\tmovpl %0, %3 \n"
142
143 "\tsubs %3, %0, %1 \n"
144 "\torrpl %2, %2, %4 \n"
145 "\tmovpl %0, %3 \n"
146
147 "\tmovs %5, %5, lsr #31 \n"
148 "\trsbne %2, %2, #0 \n"
149 : "=r" (dead1), "=r" (dead2), "=r" (res),
150 "=r" (dead3), "=r" (dead4), "=r" (dead5)
151 : "0" (a), "1" (b), "2" (res)
152 : "memory", "cc"
153 );
154 return res;
155 }
156
157
158
159
160 #endif
161