14f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/* ------------------------------------------------------------------ 24f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * Copyright (C) 1998-2009 PacketVideo 34f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * 44f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * Licensed under the Apache License, Version 2.0 (the "License"); 54f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * you may not use this file except in compliance with the License. 64f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * You may obtain a copy of the License at 74f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * 84f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * http://www.apache.org/licenses/LICENSE-2.0 94f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * 104f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * Unless required by applicable law or agreed to in writing, software 114f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * distributed under the License is distributed on an "AS IS" BASIS, 124f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either 134f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * express or implied. 144f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * See the License for the specific language governing permissions 154f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * and limitations under the License. 164f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * ------------------------------------------------------------------- 174f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber */ 184f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/**************************************************************************************** 194f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas HuberPortions of this file are derived from the following 3GPP standard: 204f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 214f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3GPP TS 26.073 224f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec 234f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Available from http://www.3gpp.org 244f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 254f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber(C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC) 264f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas HuberPermission to distribute, modify and use this file under the standard license 274f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huberterms listed above has been obtained from the copyright holder. 284f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber****************************************************************************************/ 294f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/* 304f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 314f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Filename: /audio/gsm_amr/c/src/shr.c 324f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 334f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 344f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber REVISION HISTORY 354f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 364f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Description: Created separate file for the shr function. Sync'ed up with 374f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber the current template and fixed tabs. 384f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 394f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Description: 1. Modified code by seperating var2=0 condition. 404f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2. Changed Input range definitions. 414f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 424f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Description: Made changes based on review meeting. 434f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1. Changed Overflow definition. 444f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2. Removed pseudo-code. 454f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3. Deleted (var2>15&&var1!=0) condition. 464f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 4. Moved var2>0 condition in front of var2<0 condition. 474f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 484f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Description: Changed the function prototype to pass in a pointer to the 494f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber overflow flag instead of using global data. 504f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 514f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Description: Made changes per formal review. Updated template. 524f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Removed code that updates MOPS counter. 534f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Changed parameter name from "overflow" and "pOverflow". 544f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Optimized code by eliminating unnecessary typecasting. 554f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Filled in the PSEUDO CODE section 564f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 574f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Description: Further optimized typecasting for overflow case 584f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 594f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Who: Date: 604f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Description: 614f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 624f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 634f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber MODULE DESCRIPTION 644f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Shift right function with overflow control 654f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 664f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber*/ 674f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 684f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 694f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; INCLUDES 704f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 714f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber#include "basic_op.h" 724f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 734f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 744f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; MACROS 754f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; [Define module specific macros here] 764f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 774f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 784f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 794f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; DEFINES 804f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; [Include all pre-processor statements here. Include conditional 814f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; compile variables also.] 824f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 834f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 844f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 854f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; LOCAL FUNCTION DEFINITIONS 864f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; [List function prototypes here] 874f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 884f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 894f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 904f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; LOCAL VARIABLE DEFINITIONS 914f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; [Variable declaration - defined here and used outside this module] 924f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 934f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 944f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 954f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/* 964f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 974f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber FUNCTION NAME: shr 984f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 994f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber INPUT AND OUTPUT DEFINITIONS 1004f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1014f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Inputs: 1024f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber var1 = 16 bit short signed integer (Word16) whose value falls in 1034f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber the range : 0xffff 8000 <= var1 <= 0x0000 7fff. 1044f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1054f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber var2 = 16 bit short signed integer (Word16) whose value falls in 1064f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber the range : 0xffff 8000 <= var2 <= 0x0000 7fff. 1074f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1084f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber pOverflow = pointer to overflow (Flag) 1094f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1104f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Outputs: 1114f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber pOverflow -> 1 if the shift operation resulted in overflow 1124f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1134f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Returns: 1144f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber product = Shifted result limited to 16 bits (Word16) 1154f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1164f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Global Variables Used: 1174f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber None 1184f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1194f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Local Variables Needed: 1204f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber None 1214f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1224f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1234f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber FUNCTION DESCRIPTION 1244f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1254f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber This function arithmetically shifts the 16 bit input var1 right var2 positions 1264f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber with sign extension. If var2 is negative, arithmetically shift var1 left by 1274f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber -var2 with sign extension. Saturate the result in case of underflows or 1284f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber overflows. 1294f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1304f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1314f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber REQUIREMENTS 1324f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber None 1334f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1344f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber REFERENCES 1354f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1364f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber [1] shr() function in basic_op2.c, UMTS GSM AMR speech codec, R99 - 1374f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Version 3.2.0, March 2, 2001 1384f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1394f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1404f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber PSEUDO-CODE 1414f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1424f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas HuberWord16 shr_std (Word16 var1, Word16 var2) 1434f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber{ 1444f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 var_out; 1454f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1464f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (var2 < 0) 1474f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 1484f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (var2 < -16) 1494f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber var2 = -16; 1504f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber var_out = shl_std (var1, -var2); 1514f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber#if (WMOPS) 1524f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber mult_stdiCounter[currCounter].shl_std--; 1534f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber#endif 1544f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 1554f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber else 1564f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 1574f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (var2 >= 15) 1584f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 1594f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber var_out = (var1 < 0) ? -1 : 0; 1604f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 1614f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber else 1624f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 1634f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (var1 < 0) 1644f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 1654f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber var_out = ~((~var1) >> var2); 1664f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 1674f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber else 1684f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 1694f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber var_out = var1 >> var2; 1704f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 1714f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 1724f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 1734f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1744f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber#if (WMOPS) 1754f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber mult_stdiCounter[currCounter].shr_std++; 1764f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber#endif 1774f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber return (var_out); 1784f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber} 1794f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1804f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber RESOURCES USED [optional] 1814f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1824f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber When the code is written for a specific target processor the 1834f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber the resources used should be documented below. 1844f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1854f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber HEAP MEMORY USED: x bytes 1864f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1874f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber STACK MEMORY USED: x bytes 1884f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1894f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber CLOCK CYCLES: (cycle count equation for this function) + (variable 1904f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber used to represent cycle count for each subroutine 1914f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber called) 1924f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber where: (cycle count variable) = cycle count for [subroutine 1934f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber name] 1944f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1954f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1964f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber CAUTION [optional] 1974f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber [State any special notes, constraints or cautions for users of this function] 1984f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1994f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 2004f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber*/ 2014f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2024f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 2034f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; FUNCTION CODE 2044f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 2054f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas HuberWord16 shr(register Word16 var1, register Word16 var2, Flag *pOverflow) 2064f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber{ 2074f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber register Word16 result; 2084f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber register Word32 temp_res; 2094f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2104f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (var2 != 0) 2114f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2124f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (var2 > 0) 2134f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2144f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (var2 >= 15) 2154f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2164f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber result = ((var1 < 0) ? -1 : 0); 2174f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2184f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber else 2194f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2204f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (var1 < 0) 2214f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2224f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber result = (~((~var1) >> var2)); 2234f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2244f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber else 2254f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2264f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber result = (var1 >> var2); 2274f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2284f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2294f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2304f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber else 2314f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2324f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (var2 < -16) 2334f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2344f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber var2 = -16; 2354f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2364f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2374f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber var2 = -var2; /* Shift right negative is equivalent */ 2384f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber /* to shifting left positive. */ 2394f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2404f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber temp_res = ((Word32) var1) << var2; 2414f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber result = (Word16)(temp_res); 2424f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2434f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber if (temp_res != (Word32) result) 2444f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2454f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber *pOverflow = 1; 2464f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber result = ((var1 > 0) ? MAX_16 : MIN_16); 2474f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2484f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2494f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2504f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2514f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber else 2524f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2534f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber result = var1; 2544f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2554f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2564f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber return (result); 2574f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber} 2584f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 259