| /* ------------------------------------------------------------------ |
| * Copyright (C) 1998-2009 PacketVideo |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either |
| * express or implied. |
| * See the License for the specific language governing permissions |
| * and limitations under the License. |
| * ------------------------------------------------------------------- |
| */ |
| /**************************************************************************************** |
| Portions of this file are derived from the following 3GPP standard: |
| |
| 3GPP TS 26.073 |
| ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec |
| Available from http://www.3gpp.org |
| |
| (C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC) |
| Permission to distribute, modify and use this file under the standard license |
| terms listed above has been obtained from the copyright holder. |
| ****************************************************************************************/ |
| /* |
| |
| Filename: /audio/gsm_amr/c/include/mult.h |
| |
| ------------------------------------------------------------------------------ |
| REVISION HISTORY |
| |
| Description: Created separate header file for mult function. |
| |
| Description: Changed prototype of the mult() function. Instead of using global |
| a pointer to overflow flag is now passed into the function. |
| |
| Description: Updated copyright information. |
| Updated variable name from "overflow" to "pOverflow" to match |
| with original function declaration. |
| |
| Description: Moved _cplusplus #ifdef after Include section. |
| |
| Description: Providing support for ARM and Linux-ARM assembly instructions. |
| |
| Who: Date: |
| Description: |
| |
| ------------------------------------------------------------------------------ |
| INCLUDE DESCRIPTION |
| |
| This file contains all the constant definitions and prototype definitions |
| needed by the mult function. |
| |
| ------------------------------------------------------------------------------ |
| */ |
| |
| #ifndef MULT_H |
| #define MULT_H |
| |
| /*---------------------------------------------------------------------------- |
| ; INCLUDES |
| ----------------------------------------------------------------------------*/ |
| |
| #include "basicop_malloc.h" |
| |
| /*--------------------------------------------------------------------------*/ |
| #ifdef __cplusplus |
| extern "C" |
| { |
| #endif |
| |
| /*---------------------------------------------------------------------------- |
| ; MACROS |
| ; Define module specific macros here |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; DEFINES |
| ; Include all pre-processor statements here. |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; EXTERNAL VARIABLES REFERENCES |
| ; Declare variables used in this module but defined elsewhere |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; SIMPLE TYPEDEF'S |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; ENUMERATED TYPEDEF'S |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; STRUCTURES TYPEDEF'S |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; GLOBAL FUNCTION DEFINITIONS |
| ; Function Prototype declaration |
| ----------------------------------------------------------------------------*/ |
| #if defined(PV_ARM_V5) |
| |
| __inline Word16 mult(Word16 var1, Word16 var2, Flag *pOverflow) |
| { |
| Word32 product; |
| |
| OSCL_UNUSED_ARG(pOverflow); |
| |
| __asm |
| { |
| SMULBB product, var1, var2 |
| MOV product, product, ASR #15 |
| CMP product, 0x7FFF |
| MOVGE product, 0x7FFF |
| } |
| |
| return ((Word16) product); |
| } |
| |
| #elif defined(PV_ARM_GCC_V5) |
| |
| __inline Word16 mult(Word16 var1, Word16 var2, Flag *pOverflow) |
| { |
| register Word32 ra = var1; |
| register Word32 rb = var2; |
| Word32 product; |
| Word32 temp = 0x7FFF; |
| |
| OSCL_UNUSED_ARG(pOverflow); |
| |
| asm volatile("smulbb %0, %1, %2" |
| : "=r"(product) |
| : "r"(ra), "r"(rb) |
| ); |
| asm volatile("mov %0, %1, ASR #15" |
| : "=r"(product) |
| : "r"(product) |
| ); |
| asm volatile("cmp %0, %1" |
| : "=r"(product) |
| : "r"(temp) |
| ); |
| asm volatile("movge %0, %1" |
| : "=r"(product) |
| : "r"(temp) |
| ); |
| |
| return ((Word16) product); |
| } |
| |
| #else /* C EQUIVALENT */ |
| |
| static inline Word16 mult(Word16 var1, Word16 var2, Flag *pOverflow) |
| { |
| register Word32 product; |
| |
| product = ((Word32) var1 * var2) >> 15; |
| |
| /* Saturate result (if necessary). */ |
| /* var1 * var2 >0x00007fff is the only case */ |
| /* that saturation occurs. */ |
| |
| if (product > 0x00007fffL) |
| { |
| *pOverflow = 1; |
| product = (Word32) MAX_16; |
| } |
| |
| |
| /* Return the product as a 16 bit value by type casting Word32 to Word16 */ |
| |
| return ((Word16) product); |
| } |
| |
| #endif |
| /*---------------------------------------------------------------------------- |
| ; END |
| ----------------------------------------------------------------------------*/ |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* _MULT_H_ */ |
| |
