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_l.h
31
32------------------------------------------------------------------------------
33 REVISION HISTORY
34
35 Description: Created separate header file for norm_l 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 Description: Support for ARM and Linux-ARM assembly.
43
44 Who:                       Date:
45 Description:
46
47------------------------------------------------------------------------------
48 INCLUDE DESCRIPTION
49
50 This file contains all the constant definitions and prototype definitions
51 needed by the norm_l function.
52
53------------------------------------------------------------------------------
54*/
55
56/*----------------------------------------------------------------------------
57; CONTINUE ONLY IF NOT ALREADY DEFINED
58----------------------------------------------------------------------------*/
59#ifndef NORM_L_H
60#define NORM_L_H
61
62/*----------------------------------------------------------------------------
63; INCLUDES
64----------------------------------------------------------------------------*/
65#include    "basicop_malloc.h"
66
67/*--------------------------------------------------------------------------*/
68#ifdef __cplusplus
69extern "C"
70{
71#endif
72
73    /*----------------------------------------------------------------------------
74    ; MACROS
75    ; Define module specific macros here
76    ----------------------------------------------------------------------------*/
77
78    /*----------------------------------------------------------------------------
79    ; DEFINES
80    ; Include all pre-processor statements here.
81    ----------------------------------------------------------------------------*/
82
83    /*----------------------------------------------------------------------------
84    ; EXTERNAL VARIABLES REFERENCES
85    ; Declare variables used in this module but defined elsewhere
86    ----------------------------------------------------------------------------*/
87
88    /*----------------------------------------------------------------------------
89    ; SIMPLE TYPEDEF'S
90    ----------------------------------------------------------------------------*/
91
92    /*----------------------------------------------------------------------------
93    ; ENUMERATED TYPEDEF'S
94    ----------------------------------------------------------------------------*/
95
96    /*----------------------------------------------------------------------------
97    ; STRUCTURES TYPEDEF'S
98    ----------------------------------------------------------------------------*/
99
100    /*----------------------------------------------------------------------------
101    ; GLOBAL FUNCTION DEFINITIONS
102    ; Function Prototype declaration
103    ----------------------------------------------------------------------------*/
104#if !( defined(PV_ARM_V5) || defined(PV_ARM_GCC_V5) )
105
106    /* C EQUIVALENT */
107    Word16 norm_l(Word32 L_var1);
108
109#elif defined(PV_ARM_V5)
110
111    __inline Word16 norm_l(Word32 L_var1)
112    {
113        register Word32 var_out = 0;
114
115        __asm
116        {
117            CMP    L_var1, #0
118            EORNE  L_var1, L_var1, L_var1, LSL #1
119            CLZNE  var_out, L_var1
120        }
121
122        return ((Word16)var_out);
123    }
124
125#elif defined(PV_ARM_GCC_V5)
126
127    static inline Word16 norm_l(Word32 L_var1)
128    {
129        register Word32 var_out = 0;
130        register Word32 ra = L_var1;
131        if (L_var1)
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