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/****************************************************************************************
19Portions of this file are derived from the following 3GPP standard:
20
21    3GPP TS 26.073
22    ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec
23    Available from http://www.3gpp.org
24
25(C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC)
26Permission to distribute, modify and use this file under the standard license
27terms listed above has been obtained from the copyright holder.
28****************************************************************************************/
29/*
30 Pathname: ./gsm-amr/c/include/norm_s.h
31
32------------------------------------------------------------------------------
33 REVISION HISTORY
34
35 Description: Created separate header file for norm_s function.
36
37 Description: Updated template to make it build in Symbian. Updated copyright
38              year.
39
40 Description: Moved _cplusplus #ifdef after Include section.
41
42 Who:                       Date:
43 Description:
44
45------------------------------------------------------------------------------
46 INCLUDE DESCRIPTION
47
48 This file contains all the constant definitions and prototype definitions
49 needed by the norm_s function.
50
51------------------------------------------------------------------------------
52*/
53
54/*----------------------------------------------------------------------------
55; CONTINUE ONLY IF NOT ALREADY DEFINED
56----------------------------------------------------------------------------*/
57#ifndef NORM_S_H
58#define NORM_S_H
59
60/*----------------------------------------------------------------------------
61; INCLUDES
62----------------------------------------------------------------------------*/
63#include    "basicop_malloc.h"
64
65/*--------------------------------------------------------------------------*/
66#ifdef __cplusplus
67extern "C"
68{
69#endif
70
71    /*----------------------------------------------------------------------------
72    ; MACROS
73    ; Define module specific macros here
74    ----------------------------------------------------------------------------*/
75
76    /*----------------------------------------------------------------------------
77    ; DEFINES
78    ; Include all pre-processor statements here.
79    ----------------------------------------------------------------------------*/
80
81    /*----------------------------------------------------------------------------
82    ; EXTERNAL VARIABLES REFERENCES
83    ; Declare variables used in this module but defined elsewhere
84    ----------------------------------------------------------------------------*/
85
86    /*----------------------------------------------------------------------------
87    ; SIMPLE TYPEDEF'S
88    ----------------------------------------------------------------------------*/
89
90    /*----------------------------------------------------------------------------
91    ; ENUMERATED TYPEDEF'S
92    ----------------------------------------------------------------------------*/
93
94    /*----------------------------------------------------------------------------
95    ; STRUCTURES TYPEDEF'S
96    ----------------------------------------------------------------------------*/
97
98    /*----------------------------------------------------------------------------
99    ; GLOBAL FUNCTION DEFINITIONS
100    ; Function Prototype declaration
101    ----------------------------------------------------------------------------*/
102#if !( defined(PV_ARM_V5) || defined(PV_ARM_GCC_V5) )
103
104    /* C EQUIVALENT */
105
106    Word16 norm_s(Word16 var1);
107
108#elif defined(PV_ARM_V5)
109
110    __inline Word16  norm_s(Word16 var)
111    {
112        register Word32 var_out = 0;
113        Word32 var1 = var << 16;
114
115        __asm
116        {
117            CMP    var1, #0
118            EORNE  var1, var1, var1, LSL #1
119            CLZNE  var_out, var1
120        }
121
122        return ((Word16)var_out);
123    }
124
125#elif defined(PV_ARM_GCC_V5)
126
127    static inline Word16 norm_s(Word16 var1)
128    {
129        register Word32 var_out = 0;
130        register Word32 ra = var1 << 16;
131        if (ra)
132        {
133            ra ^= (ra << 1);
134            asm volatile(
135                "clz %0, %1"
136    : "=r"(var_out)
137                        : "r"(ra)
138                    );
139        }
140        return (var_out);
141    }
142
143#endif
144    /*----------------------------------------------------------------------------
145    ; END
146    ----------------------------------------------------------------------------*/
147#ifdef __cplusplus
148}
149#endif
150
151#endif
152
153
154