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 ------------------------------------------------------------------------------
31 INPUT AND OUTPUT DEFINITIONS
34 L_var1 = 32 bit long signed integer (Word32) whose value falls
35 in the range : 0x8000 0000 <= L_var1 <= 0x7fff ffff.
37 Local Stores/Buffers/Pointers Needed:
40 Global Stores/Buffers/Pointers Needed:
44 L_var1 = 32-bit negation of input
46 Pointers and Buffers Modified:
49 Local Stores Modified:
52 Global Stores Modified:
55 ------------------------------------------------------------------------------
58 This function negates the 32 bit variable, L_var1, with saturation; saturate
59 in the case where input is -2147483648 (0x8000 0000).
61 ------------------------------------------------------------------------------
66 ------------------------------------------------------------------------------
69 [1] basicop2.c, ETS Version 2.0.0, February 8, 1999
71 ------------------------------------------------------------------------------
74 Word32 L_negate (Word32 L_var1)
78 L_var_out = (L_var1 == MIN_32) ? MAX_32 : -L_var1;
80 multiCounter[currCounter].L_negate++;
85 ------------------------------------------------------------------------------
89 /*----------------------------------------------------------------------------
91 ----------------------------------------------------------------------------*/
94 /*----------------------------------------------------------------------------
96 ; Define module specific macros here
97 ----------------------------------------------------------------------------*/
99 /*----------------------------------------------------------------------------
101 ; Include all pre-processor statements here. Include conditional
102 ; compile variables also.
103 ----------------------------------------------------------------------------*/
105 /*----------------------------------------------------------------------------
106 ; LOCAL FUNCTION DEFINITIONS
107 ; Function Prototype declaration
108 ----------------------------------------------------------------------------*/
110 /*----------------------------------------------------------------------------
111 ; LOCAL STORE/BUFFER/POINTER DEFINITIONS
112 ; Variable declaration - defined here and used outside this module
113 ----------------------------------------------------------------------------*/
115 /*----------------------------------------------------------------------------
116 ; EXTERNAL FUNCTION REFERENCES
117 ; Declare functions defined elsewhere and referenced in this module
118 ----------------------------------------------------------------------------*/
120 /*----------------------------------------------------------------------------
121 ; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES
122 ; Declare variables used in this module but defined elsewhere
123 ----------------------------------------------------------------------------*/
125 /*----------------------------------------------------------------------------
127 ----------------------------------------------------------------------------*/
128 Word32 L_negate(register Word32 L_var1)
130 /*----------------------------------------------------------------------------
131 ; Define all local variables
132 ----------------------------------------------------------------------------*/
134 /*----------------------------------------------------------------------------
136 ----------------------------------------------------------------------------*/
137 L_var1 = (L_var1 == MIN_32) ? MAX_32 : -L_var1;
139 /*----------------------------------------------------------------------------
140 ; Return nothing or data or data pointer
141 ----------------------------------------------------------------------------*/