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