1 /*
2 * Copyright (C) 2004-2010 NXP Software
3 * Copyright (C) 2010 The Android Open Source Project
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 /**********************************************************************************
19 INCLUDE FILES
20 ***********************************************************************************/
21
22 #include "VectorArithmetic.h"
23
24 /**********************************************************************************
25 FUNCTION ADD2_SAT_32X32
26 ***********************************************************************************/
27
Add2_Sat_32x32(const LVM_INT32 * src,LVM_INT32 * dst,LVM_INT16 n)28 void Add2_Sat_32x32( const LVM_INT32 *src,
29 LVM_INT32 *dst,
30 LVM_INT16 n )
31 {
32 LVM_INT32 a,b,c;
33 LVM_INT16 ii;
34 for (ii = n; ii != 0; ii--)
35 {
36 a=*src;
37 src++;
38
39 b=*dst;
40 c=a+b;
41 if ((((c ^ a) & (c ^ b)) >> 31)!=0) /* overflow / underflow */
42 {
43 if(a<0)
44 {
45 c=0x80000000L;
46 }
47 else
48 {
49 c=0x7FFFFFFFL;
50 }
51 }
52
53 *dst = c;
54 dst++;
55 }
56 return;
57 }
58
Add2_Sat_Float(const LVM_FLOAT * src,LVM_FLOAT * dst,LVM_INT16 n)59 void Add2_Sat_Float( const LVM_FLOAT *src,
60 LVM_FLOAT *dst,
61 LVM_INT16 n )
62 {
63 LVM_FLOAT Temp;
64 LVM_INT16 ii;
65 for (ii = n; ii != 0; ii--)
66 {
67 Temp = ((LVM_FLOAT) *src) + ((LVM_FLOAT) *dst);
68 src++;
69
70 if (Temp > 1.000000f)
71 {
72 *dst = 1.000000f;
73 }
74 else if (Temp < -1.000000f)
75 {
76 *dst = -1.000000f;
77 }
78 else
79 {
80 *dst = Temp;
81 }
82 dst++;
83 }
84 return;
85 }
86 /**********************************************************************************/
87