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 ------------------------------------------------------------------------------ 20 PacketVideo Corp. 21 MP3 Decoder Library 22 23 Filename: pvmp3_normalize.h 24 25 Date: 10/02/2007 26 27 ------------------------------------------------------------------------------ 28 REVISION HISTORY 29 30 Description: 31 ------------------------------------------------------------------------------ 32 INCLUDE DESCRIPTION 33 34 ------------------------------------------------------------------------------ 35 */ 36 37 #ifndef PVMP3_NORMALIZE_H 38 #define PVMP3_NORMALIZE_H 39 40 41 /*---------------------------------------------------------------------------- 42 ; INCLUDES 43 ----------------------------------------------------------------------------*/ 44 45 #include "pvmp3_audio_type_defs.h" 46 47 /*---------------------------------------------------------------------------- 48 ; MACROS 49 ; Define module specific macros here 50 ----------------------------------------------------------------------------*/ 51 52 /*---------------------------------------------------------------------------- 53 ; EXTERNAL VARIABLES REFERENCES 54 ----------------------------------------------------------------------------*/ 55 56 /*---------------------------------------------------------------------------- 57 ; DEFINES AND SIMPLE TYPEDEF'S 58 ----------------------------------------------------------------------------*/ 59 60 #if (defined(PV_ARM_V5)||defined(PV_ARM_V4)) 61 62 __inline int32 pvmp3_normalize(int32 x) 63 { 64 int32 y; 65 __asm 66 { 67 clz y, x; 68 sub y, y, #1 69 } 70 return (y); 71 } 72 73 74 #elif (defined(PV_ARM_GCC_V5)||defined(PV_ARM_GCC_V4)) 75 76 __inline int32 pvmp3_normalize(int32 x) 77 { 78 register int32 y; 79 register int32 ra = x; 80 81 82 asm volatile( 83 "clz %0, %1\n\t" 84 "sub %0, %0, #1" 85 : "=&r*i"(y) 86 : "r"(ra)); 87 return (y); 88 89 } 90 91 #else 92 93 #ifdef __cplusplus 94 extern "C" 95 { 96 #endif 97 98 int32 pvmp3_normalize(int32 x); 99 100 #ifdef __cplusplus 101 } 102 #endif 103 104 #endif 105 106 107 108 #endif /* PV_NORMALIZE_H */ 109
