1 /* ------------------------------------------------------------------
2 * Copyright (C) 1998-2009 PacketVideo
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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
14 * See the License for the specific language governing permissions
15 * and limitations under the License.
16 * -------------------------------------------------------------------
18 /****************************************************************************************
19 Portions of this file are derived from the following 3GPP standard:
22 ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec
23 Available from http://www.3gpp.org
25 (C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC)
26 Permission to distribute, modify and use this file under the standard license
27 terms listed above has been obtained from the copyright holder.
28 ****************************************************************************************/
30 Pathname: ./gsm-amr/c/src/l_abs.c
32 ------------------------------------------------------------------------------
35 Description: Created separate file for the L_abs function. Sync'ed up
36 with the current template and fixed tabs.
38 Description: Removed conditional code that updates WMOPS counter
43 ------------------------------------------------------------------------------
44 INPUT AND OUTPUT DEFINITIONS
47 L_var1 = 32 bit long signed integer (Word32 ) whose value falls
48 in the range : 0x8000 0000 <= L_var1 <= 0x7fff ffff.
50 Local Stores/Buffers/Pointers Needed:
53 Global Stores/Buffers/Pointers Needed:
57 L_var1 = absolute value of input (Word32)
59 Pointers and Buffers Modified:
62 Local Stores Modified:
65 Global Stores Modified:
68 ------------------------------------------------------------------------------
71 This function calculates the absolute value of L_var1; saturate in case
72 where the input is -214783648.
74 ------------------------------------------------------------------------------
79 ------------------------------------------------------------------------------
82 [1] basicop2.c, ETS Version 2.0.0, February 8, 1999
84 ------------------------------------------------------------------------------
87 Word32 L_abs (Word32 L_var1)
108 multiCounter[currCounter].L_abs++;
114 ------------------------------------------------------------------------------
116 When the code is written for a specific target processor the
117 the resources used should be documented below.
119 STACK USAGE: [stack count for this module] + [variable to represent
120 stack usage for each subroutine called]
122 where: [stack usage variable] = stack usage for [subroutine
123 name] (see [filename].ext)
125 DATA MEMORY USED: x words
127 PROGRAM MEMORY USED: x words
129 CLOCK CYCLES: [cycle count equation for this module] + [variable
130 used to represent cycle count for each subroutine
133 where: [cycle count variable] = cycle count for [subroutine
134 name] (see [filename].ext)
136 ------------------------------------------------------------------------------
140 /*----------------------------------------------------------------------------
142 ----------------------------------------------------------------------------*/
143 #include "basic_op.h"
145 /*----------------------------------------------------------------------------
147 ; Define module specific macros here
148 ----------------------------------------------------------------------------*/
150 /*----------------------------------------------------------------------------
152 ; Include all pre-processor statements here. Include conditional
153 ; compile variables also.
154 ----------------------------------------------------------------------------*/
156 /*----------------------------------------------------------------------------
157 ; LOCAL FUNCTION DEFINITIONS
158 ; Function Prototype declaration
159 ----------------------------------------------------------------------------*/
161 /*----------------------------------------------------------------------------
162 ; LOCAL STORE/BUFFER/POINTER DEFINITIONS
163 ; Variable declaration - defined here and used outside this module
164 ----------------------------------------------------------------------------*/
166 /*----------------------------------------------------------------------------
167 ; EXTERNAL FUNCTION REFERENCES
168 ; Declare functions defined elsewhere and referenced in this module
169 ----------------------------------------------------------------------------*/
171 /*----------------------------------------------------------------------------
172 ; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES
173 ; Declare variables used in this module but defined elsewhere
174 ----------------------------------------------------------------------------*/
176 /*----------------------------------------------------------------------------
178 ----------------------------------------------------------------------------*/
179 Word32 L_abs(register Word32 L_var1)
181 /*----------------------------------------------------------------------------
182 ; Define all local variables
183 ----------------------------------------------------------------------------*/
185 /*----------------------------------------------------------------------------
187 ----------------------------------------------------------------------------*/
189 Word32 y = L_var1 - (L_var1 < 0);