1 /*
2  * Copyright (C) 2008 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef bts_FLT_16_VEC_EM_H
18 #define bts_FLT_16_VEC_EM_H
19 
20 /* ---- includes ----------------------------------------------------------- */
21 
22 #include "b_BasicEm/Context.h"
23 #include "b_BasicEm/MemSeg.h"
24 #include "b_BasicEm/Int16Arr.h"
25 #include "b_TensorEm/Functions.h"
26 
27 /* ---- related objects  --------------------------------------------------- */
28 
29 /* ---- typedefs ----------------------------------------------------------- */
30 
31 /* ---- constants ---------------------------------------------------------- */
32 
33 /* ---- object definition -------------------------------------------------- */
34 
35 /**
36  * Vector with 16 bit components
37  * The vector operations are implemented with respect to maintain high accuracy and
38  * overflow safety for all possible vector configurations.
39  */
40 struct bts_Flt16Vec
41 {
42 
43 	/* ---- private data --------------------------------------------------- */
44 
45 	/* ---- public data ---------------------------------------------------- */
46 
47 	/** array of vector elements */
48 	struct bbs_Int16Arr arrE;
49 
50 	/** exponent to elements */
51 	int16 expE;
52 };
53 
54 /* ---- associated objects ------------------------------------------------- */
55 
56 /* ---- external functions ------------------------------------------------- */
57 
58 /* ---- \ghd{ constructor/destructor } ------------------------------------- */
59 
60 /** initializes vector */
61 void bts_Flt16Vec_init( struct bbs_Context* cpA,
62 						struct bts_Flt16Vec* ptrA );
63 
64 /** destroys vector */
65 void bts_Flt16Vec_exit( struct bbs_Context* cpA,
66 						struct bts_Flt16Vec* ptrA );
67 
68 /* ---- \ghd{ operators } -------------------------------------------------- */
69 
70 /** copies vector */
71 void bts_Flt16Vec_copy( struct bbs_Context* cpA,
72 						struct bts_Flt16Vec* ptrA,
73 						const struct bts_Flt16Vec* srcPtrA );
74 
75 /** compares vector */
76 flag bts_Flt16Vec_equal( struct bbs_Context* cpA,
77 						 const struct bts_Flt16Vec* ptrA,
78 						 const struct bts_Flt16Vec* srcPtrA );
79 
80 /* ---- \ghd{ query functions } -------------------------------------------- */
81 
82 /** returns average of vector without exponent */
83 int16 bts_Flt16Vec_avg( struct bbs_Context* cpA, const struct bts_Flt16Vec* ptrA );
84 
85 /** returns norm of vector without exponent */
86 uint32 bts_Flt16Vec_norm( struct bbs_Context* cpA, const struct bts_Flt16Vec* ptrA );
87 
88 /** returns maximum absulute value without exponent */
89 uint16 bts_Flt16Vec_maxAbs( struct bbs_Context* cpA, const struct bts_Flt16Vec* ptrA );
90 
91 /* ---- \ghd{ modify functions } ------------------------------------------- */
92 
93 /** allocates vector */
94 void bts_Flt16Vec_create( struct bbs_Context* cpA,
95 						  struct bts_Flt16Vec* ptrA,
96 						  uint32 sizeA,
97 						  struct bbs_MemSeg* mspA );
98 
99 /** resize vector (sizeA must be smaller or equal to allocated size)*/
100 void bts_Flt16Vec_size( struct bbs_Context* cpA,
101 						struct bts_Flt16Vec* ptrA,
102 						uint32 sizeA );
103 
104 /* ---- \ghd{ memory I/O } ------------------------------------------------- */
105 
106 /** size in words (16-bit) object needs when written to memory */
107 uint32 bts_Flt16Vec_memSize( struct bbs_Context* cpA,
108 							 const struct bts_Flt16Vec* ptrA );
109 
110 /** writes object to memory; returns number of words (16-bit) written */
111 uint32 bts_Flt16Vec_memWrite( struct bbs_Context* cpA,
112 							  const struct bts_Flt16Vec* ptrA,
113 							  uint16* memPtrA );
114 
115 /** reads object from memory; returns number of words (16-bit) read */
116 uint32 bts_Flt16Vec_memRead( struct bbs_Context* cpA,
117 							 struct bts_Flt16Vec* ptrA,
118 							 const uint16* memPtrA,
119 						     struct bbs_MemSeg* mspA );
120 
121 /* ---- \ghd{ exec functions } --------------------------------------------- */
122 
123 /** maximize mantisse values to reduce error propagation through multiple vector operations */
124 void bts_Flt16Vec_maximizeMantisse( struct bbs_Context* cpA, struct bts_Flt16Vec* ptrA );
125 
126 /** scales vector such that max abs is as near as possible to 0x7FFF; returns scale factor used in format 16.16; returns 0 when vector is 0 */
127 uint32 bts_Flt16Vec_maximizeAbsValue( struct bbs_Context* cpA, struct bts_Flt16Vec* ptrA );
128 
129 /** tranlates vector to zero average */
130 void bts_Flt16Vec_zeroAverage( struct bbs_Context* cpA, struct bts_Flt16Vec* ptrA );
131 
132 /** normalizes vector (euclidean norm) */
133 void bts_Flt16Vec_normalize( struct bbs_Context* cpA, struct bts_Flt16Vec* ptrA );
134 
135 /** sets vector to zero */
136 void bts_Flt16Vec_setZero( struct bbs_Context* cpA, struct bts_Flt16Vec* ptrA );
137 
138 /** multiplies a scalar to vector */
139 void bts_Flt16Vec_mul( struct bbs_Context* cpA, struct bts_Flt16Vec* ptrA, int32 valA, int16 expA );
140 
141 /** computes dot product; returns product as mantisse + exponent */
142 void bts_Flt16Vec_dotPtrd( struct bbs_Context* cpA, struct bts_Flt16Vec* vp1A, struct bts_Flt16Vec* vp2A, int32* manPtrA, int32* expPtrA );
143 
144 /** appends a vector */
145 void bts_Flt16Vec_append( struct bbs_Context* cpA, struct bts_Flt16Vec* ptrA, struct bts_Flt16Vec* srcPtrA );
146 
147 #endif /* bts_FLT_16_VEC_EM_H */
148 
149