283 lines
6.2 KiB
C
283 lines
6.2 KiB
C
/* ***** BEGIN LICENSE BLOCK *****
|
|
* Version: RCSL 1.0/RPSL 1.0
|
|
*
|
|
* Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved.
|
|
*
|
|
* The contents of this file, and the files included with this file, are
|
|
* subject to the current version of the RealNetworks Public Source License
|
|
* Version 1.0 (the "RPSL") available at
|
|
* http://www.helixcommunity.org/content/rpsl unless you have licensed
|
|
* the file under the RealNetworks Community Source License Version 1.0
|
|
* (the "RCSL") available at http://www.helixcommunity.org/content/rcsl,
|
|
* in which case the RCSL will apply. You may also obtain the license terms
|
|
* directly from RealNetworks. You may not use this file except in
|
|
* compliance with the RPSL or, if you have a valid RCSL with RealNetworks
|
|
* applicable to this file, the RCSL. Please see the applicable RPSL or
|
|
* RCSL for the rights, obligations and limitations governing use of the
|
|
* contents of the file.
|
|
*
|
|
* This file is part of the Helix DNA Technology. RealNetworks is the
|
|
* developer of the Original Code and owns the copyrights in the portions
|
|
* it created.
|
|
*
|
|
* This file, and the files included with this file, is distributed and made
|
|
* available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
|
|
* EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES,
|
|
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS
|
|
* FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
|
|
*
|
|
* Technology Compatibility Kit Test Suite(s) Location:
|
|
* http://www.helixcommunity.org/content/tck
|
|
*
|
|
* Contributor(s):
|
|
*
|
|
* ***** END LICENSE BLOCK ***** */
|
|
|
|
/**************************************************************************************
|
|
* Fixed-point MP3 decoder
|
|
* Jon Recker (jrecker@real.com), Ken Cooke (kenc@real.com)
|
|
* June 2003
|
|
*
|
|
* assembly.h - assembly language functions and prototypes for supported platforms
|
|
*
|
|
* - inline rountines with access to 64-bit multiply results
|
|
* - x86 (_WIN32) and ARM (ARM_ADS, _WIN32_WCE) versions included
|
|
* - some inline functions are mix of asm and C for speed
|
|
* - some functions are in native asm files, so only the prototype is given here
|
|
*
|
|
* MULSHIFT32(x, y) signed multiply of two 32-bit integers (x and y), returns top 32 bits of 64-bit result
|
|
* FASTABS(x) branchless absolute value of signed integer x
|
|
* CLZ(x) count leading zeros in x
|
|
* MADD64(sum, x, y) (Windows only) sum [64-bit] += x [32-bit] * y [32-bit]
|
|
* SHL64(sum, x, y) (Windows only) 64-bit left shift using __int64
|
|
* SAR64(sum, x, y) (Windows only) 64-bit right shift using __int64
|
|
*/
|
|
|
|
#ifndef _ASSEMBLY_H
|
|
#define _ASSEMBLY_H
|
|
|
|
#if (defined _WIN32 && !defined _WIN32_WCE) || (defined __WINS__ && defined _SYMBIAN) || defined(_OPENWAVE_SIMULATOR) || defined(WINCE_EMULATOR) /* Symbian emulator for Ix86 */
|
|
|
|
#pragma warning( disable : 4035 ) /* complains about inline asm not returning a value */
|
|
|
|
static __inline int MULSHIFT32(int x, int y)
|
|
{
|
|
__asm {
|
|
mov eax, x
|
|
imul y
|
|
mov eax, edx
|
|
}
|
|
}
|
|
|
|
static __inline int FASTABS(int x)
|
|
{
|
|
int sign;
|
|
|
|
sign = x >> (sizeof(int) * 8 - 1);
|
|
x ^= sign;
|
|
x -= sign;
|
|
|
|
return x;
|
|
}
|
|
|
|
static __inline int CLZ(int x)
|
|
{
|
|
int numZeros;
|
|
|
|
if (!x)
|
|
return (sizeof(int) * 8);
|
|
|
|
numZeros = 0;
|
|
while (!(x & 0x80000000)) {
|
|
numZeros++;
|
|
x <<= 1;
|
|
}
|
|
|
|
return numZeros;
|
|
}
|
|
|
|
/* MADD64, SHL64, SAR64:
|
|
* write in assembly to avoid dependency on run-time lib for 64-bit shifts, muls
|
|
* (sometimes compiler thunks to function calls instead of code generating)
|
|
* required for Symbian emulator
|
|
*/
|
|
#ifdef __CW32__
|
|
typedef long long Word64;
|
|
#else
|
|
typedef __int64 Word64;
|
|
#endif
|
|
|
|
static __inline Word64 MADD64(Word64 sum, int x, int y)
|
|
{
|
|
unsigned int sumLo = ((unsigned int *)&sum)[0];
|
|
int sumHi = ((int *)&sum)[1];
|
|
|
|
__asm {
|
|
mov eax, x
|
|
imul y
|
|
add eax, sumLo
|
|
adc edx, sumHi
|
|
}
|
|
|
|
/* equivalent to return (sum + ((__int64)x * y)); */
|
|
}
|
|
|
|
static __inline Word64 SHL64(Word64 x, int n)
|
|
{
|
|
unsigned int xLo = ((unsigned int *)&x)[0];
|
|
int xHi = ((int *)&x)[1];
|
|
unsigned char nb = (unsigned char)n;
|
|
|
|
if (n < 32) {
|
|
__asm {
|
|
mov edx, xHi
|
|
mov eax, xLo
|
|
mov cl, nb
|
|
shld edx, eax, cl
|
|
shl eax, cl
|
|
}
|
|
} else if (n < 64) {
|
|
/* shl masks cl to 0x1f */
|
|
__asm {
|
|
mov edx, xLo
|
|
mov cl, nb
|
|
xor eax, eax
|
|
shl edx, cl
|
|
}
|
|
} else {
|
|
__asm {
|
|
xor edx, edx
|
|
xor eax, eax
|
|
}
|
|
}
|
|
}
|
|
|
|
static __inline Word64 SAR64(Word64 x, int n)
|
|
{
|
|
unsigned int xLo = ((unsigned int *)&x)[0];
|
|
int xHi = ((int *)&x)[1];
|
|
unsigned char nb = (unsigned char)n;
|
|
|
|
if (n < 32) {
|
|
__asm {
|
|
mov edx, xHi
|
|
mov eax, xLo
|
|
mov cl, nb
|
|
shrd eax, edx, cl
|
|
sar edx, cl
|
|
}
|
|
} else if (n < 64) {
|
|
/* sar masks cl to 0x1f */
|
|
__asm {
|
|
mov edx, xHi
|
|
mov eax, xHi
|
|
mov cl, nb
|
|
sar edx, 31
|
|
sar eax, cl
|
|
}
|
|
} else {
|
|
__asm {
|
|
sar xHi, 31
|
|
mov eax, xHi
|
|
mov edx, xHi
|
|
}
|
|
}
|
|
}
|
|
|
|
#elif (defined _WIN32) && (defined _WIN32_WCE)
|
|
|
|
/* use asm function for now (EVC++ 3.0 does horrible job compiling __int64 version) */
|
|
#define MULSHIFT32 xmp3_MULSHIFT32
|
|
int MULSHIFT32(int x, int y);
|
|
|
|
static __inline int FASTABS(int x)
|
|
{
|
|
int sign;
|
|
|
|
sign = x >> (sizeof(int) * 8 - 1);
|
|
x ^= sign;
|
|
x -= sign;
|
|
|
|
return x;
|
|
}
|
|
|
|
static __inline int CLZ(int x)
|
|
{
|
|
int numZeros;
|
|
|
|
if (!x)
|
|
return (sizeof(int) * 8);
|
|
|
|
numZeros = 0;
|
|
while (!(x & 0x80000000)) {
|
|
numZeros++;
|
|
x <<= 1;
|
|
}
|
|
|
|
return numZeros;
|
|
}
|
|
|
|
#elif defined ARM_ADS
|
|
|
|
typedef long long Word64;
|
|
|
|
#define MULSHIFT32 xmp3_MULSHIFT32
|
|
extern int MULSHIFT32(int x, int y);
|
|
|
|
|
|
#define FASTABS xmp3_FASTABS
|
|
int FASTABS(int x);
|
|
|
|
|
|
static __inline int CLZ(int x)
|
|
{
|
|
int numZeros;
|
|
|
|
if (!x)
|
|
return (sizeof(int) * 8);
|
|
|
|
numZeros = 0;
|
|
while (!(x & 0x80000000)) {
|
|
numZeros++;
|
|
x <<= 1;
|
|
}
|
|
|
|
return numZeros;
|
|
}
|
|
|
|
#elif defined(__GNUC__) && defined(ARM)
|
|
|
|
typedef long long Word64;
|
|
|
|
#define MULSHIFT32 xmp3_MULSHIFT32
|
|
extern int MULSHIFT32(int x, int y);
|
|
|
|
|
|
#define FASTABS xmp3_FASTABS
|
|
int FASTABS(int x);
|
|
|
|
|
|
static __inline int CLZ(int x)
|
|
{
|
|
int numZeros;
|
|
|
|
if (!x)
|
|
return (sizeof(int) * 8);
|
|
|
|
numZeros = 0;
|
|
while (!(x & 0x80000000)) {
|
|
numZeros++;
|
|
x <<= 1;
|
|
}
|
|
|
|
return numZeros;
|
|
}
|
|
|
|
#else
|
|
|
|
#error Unsupported platform in assembly.h
|
|
|
|
#endif /* platforms */
|
|
|
|
#endif /* _ASSEMBLY_H */
|