1 /* ------------------------------------------------------------------
2 * Copyright (C) 1998-2009 PacketVideo
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
13 * express or implied.
14 * See the License for the specific language governing permissions
15 * and limitations under the License.
16 * -------------------------------------------------------------------
17 */
18 /*
19 ------------------------------------------------------------------------------
20 PacketVideo Corp.
21 MP3 Decoder Library
22
23 Filename: pvmp3_normalize.h
24
25 Date: 10/02/2007
26
27 ------------------------------------------------------------------------------
28 REVISION HISTORY
29
30 Description:
31 ------------------------------------------------------------------------------
32 INCLUDE DESCRIPTION
33
34 ------------------------------------------------------------------------------
35 */
36
37 #ifndef PVMP3_NORMALIZE_H
38 #define PVMP3_NORMALIZE_H
39
40
41 /*----------------------------------------------------------------------------
42 ; INCLUDES
43 ----------------------------------------------------------------------------*/
44
45 #include "pvmp3_audio_type_defs.h"
46
47 /*----------------------------------------------------------------------------
48 ; MACROS
49 ; Define module specific macros here
50 ----------------------------------------------------------------------------*/
51
52 /*----------------------------------------------------------------------------
53 ; EXTERNAL VARIABLES REFERENCES
54 ----------------------------------------------------------------------------*/
55
56 /*----------------------------------------------------------------------------
57 ; DEFINES AND SIMPLE TYPEDEF'S
58 ----------------------------------------------------------------------------*/
59
60 #if (defined(PV_ARM_V5)||defined(PV_ARM_V4))
61
pvmp3_normalize(int32 x)62 __inline int32 pvmp3_normalize(int32 x)
63 {
64 int32 y;
65 __asm
66 {
67 clz y, x;
68 sub y, y, #1
69 }
70 return (y);
71 }
72
73
74 #elif (defined(PV_ARM_GCC_V5)||defined(PV_ARM_GCC_V4))
75
pvmp3_normalize(int32 x)76 __inline int32 pvmp3_normalize(int32 x)
77 {
78 register int32 y;
79 register int32 ra = x;
80
81
82 asm volatile(
83 "clz %0, %1\n\t"
84 "sub %0, %0, #1"
85 : "=&r*i"(y)
86 : "r"(ra));
87 return (y);
88
89 }
90
91 #else
92
93 #ifdef __cplusplus
94 extern "C"
95 {
96 #endif
97
98 int32 pvmp3_normalize(int32 x);
99
100 #ifdef __cplusplus
101 }
102 #endif
103
104 #endif
105
106
107
108 #endif /* PV_NORMALIZE_H */
109