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 Portions 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) 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 ****************************************************************************************/ 29 /* 30 31 Filename: /audio/gsm_amr/c/include/l_sub.h 32 33 ------------------------------------------------------------------------------ 34 REVISION HISTORY 35 36 Description: Created separate header file for L_sub function. 37 38 Description: Updated function prototype declaration to reflect new interface. 39 A pointer to overflow flag is passed into the function. Updated 40 template. 41 42 Description: Moved _cplusplus #ifdef after Include section. 43 44 Description: Providing support for ARM and Linux-ARM assembly instructions. 45 46 Who: Date: 47 Description: 48 49 ------------------------------------------------------------------------------ 50 INCLUDE DESCRIPTION 51 52 This file contains all the constant definitions and prototype definitions 53 needed by the L_sub function. 54 55 ------------------------------------------------------------------------------ 56 */ 57 58 /*---------------------------------------------------------------------------- 59 ; CONTINUE ONLY IF NOT ALREADY DEFINED 60 ----------------------------------------------------------------------------*/ 61 #ifndef L_SUB_H 62 #define L_SUB_H 63 64 65 /*---------------------------------------------------------------------------- 66 ; INCLUDES 67 ----------------------------------------------------------------------------*/ 68 #include "basicop_malloc.h" 69 70 /*--------------------------------------------------------------------------*/ 71 #ifdef __cplusplus 72 extern "C" 73 { 74 #endif 75 76 /*---------------------------------------------------------------------------- 77 ; MACROS 78 ; Define module specific macros here 79 ----------------------------------------------------------------------------*/ 80 81 /*---------------------------------------------------------------------------- 82 ; DEFINES 83 ; Include all pre-processor statements here. 84 ----------------------------------------------------------------------------*/ 85 86 /*---------------------------------------------------------------------------- 87 ; EXTERNAL VARIABLES REFERENCES 88 ; Declare variables used in this module but defined elsewhere 89 ----------------------------------------------------------------------------*/ 90 91 /*---------------------------------------------------------------------------- 92 ; SIMPLE TYPEDEF'S 93 ----------------------------------------------------------------------------*/ 94 95 /*---------------------------------------------------------------------------- 96 ; ENUMERATED TYPEDEF'S 97 ----------------------------------------------------------------------------*/ 98 99 /*---------------------------------------------------------------------------- 100 ; STRUCTURES TYPEDEF'S 101 ----------------------------------------------------------------------------*/ 102 103 /*---------------------------------------------------------------------------- 104 ; GLOBAL FUNCTION DEFINITIONS 105 ; Function Prototype declaration 106 ----------------------------------------------------------------------------*/ 107 #if defined(PV_ARM_V5) /* Instructions for ARM Assembly on ADS*/ 108 109 __inline Word32 L_sub(Word32 L_var1, Word32 L_var2, Flag *pOverflow) 110 { 111 Word32 result; 112 113 OSCL_UNUSED_ARG(pOverflow); 114 115 __asm 116 { 117 QSUB result, L_var1, L_var2 118 } 119 120 return(result); 121 122 } 123 124 #elif defined(PV_ARM_GCC_V5) /* Instructions for ARM-linux cross-compiler*/ 125 126 __inline Word32 L_sub(Word32 L_var1, Word32 L_var2, Flag *pOverflow) 127 { 128 register Word32 ra = L_var1; 129 register Word32 rb = L_var2; 130 Word32 result; 131 132 OSCL_UNUSED_ARG(pOverflow); 133 134 asm volatile("qsub %0, %1, %2" 135 : "=r"(result) 136 : "r"(ra), "r"(rb) 137 ); 138 139 return (result); 140 } 141 142 #else /* C EQUIVALENT */ 143 144 static inline Word32 L_sub(register Word32 L_var1, register Word32 L_var2, 145 register Flag *pOverflow) 146 { 147 Word32 L_diff; 148 149 L_diff = L_var1 - L_var2; 150 151 if ((L_var1 ^ L_var2) < 0) 152 { 153 if ((L_diff ^ L_var1) & MIN_32) 154 { 155 L_diff = (L_var1 < 0L) ? MIN_32 : MAX_32; 156 *pOverflow = 1; 157 } 158 } 159 160 return (L_diff); 161 } 162 163 #endif 164 /*---------------------------------------------------------------------------- 165 ; END 166 ----------------------------------------------------------------------------*/ 167 #ifdef __cplusplus 168 } 169 #endif 170 171 #endif /* _L_SUB_H_ */ 172 173 174
