#error Unsupported platform in assembly.h
下面是assembly.h文件
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/**************************************************************************************
* 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
static __inline int MULSHIFT32(int x, int y)
{
/* important rules for smull RdLo, RdHi, Rm, Rs:
* RdHi and Rm can't be the same register
* RdLo and Rm can't be the same register
* RdHi and RdLo can't be the same register
* Note: Rs determines early termination (leading sign bits) so if you want to specify
* which operand is Rs, put it in the SECOND argument (y)
* For inline assembly, x and y are not assumed to be R0, R1 so it shouldn't matter
* which one is returned. (If this were a function call, returning y (R1) would
* require an extra "mov r0, r1")
*/
int zlow;
__asm {
smull zlow,y,x,y
}
return y;
}
static __inline int FASTABS(int x)
{
int t=0; /*Really is not necessary to initialiaze only to avoid warning*/
__asm {
eor t, x, x, asr #31
sub t, t, x, asr #31
}
return t;
}
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)
//added by yongjian.ma
typedef long long Word64;
//added by yongjian.ma
static __inline Word64 MADD64(Word64 sum64, int x, int y)
{
return (sum64 + ((long long)x * y));
}
static __inline int MULSHIFT32(int x, int y)
{
/* important rules for smull RdLo, RdHi, Rm, Rs:
* RdHi and Rm can't be the same register
* RdLo and Rm can't be the same register
* RdHi and RdLo can't be the same register
* Note: Rs determines early termination (leading sign bits) so if you want to specify
* which operand is Rs, put it in the SECOND argument (y)
* For inline assembly, x and y are not assumed to be R0, R1 so it shouldn't matter
* which one is returned. (If this were a function call, returning y (R1) would
* require an extra "mov r0, r1")
*/
//int zlow;
//__asm__ volatile ("smull %0,%1,%2,%3" : "=&r" (zlow), "=r" (y) : "r" (x), "1" (y)) ;
//
//return y;
//modify by yongjian.ma
return (int)((((long long) x) * y ) >> 32);
}
static __inline int FASTABS(int x)
{
//int t=0; /*Really is not necessary to initialiaze only to avoid warning*/
//__asm__ volatile (
// "eor %0,%2,%2, asr #31;"
// "sub %0,%1,%2, asr #31;"
// : "=&r" (t)
// : "0" (t), "r" (x)
//);
//
//return t;
//added by yongjian.ma
return((x > 0) ? x : -(x));
}
static __inline Word64 SAR64(Word64 x, int n)
{
return x >> n;
}
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(MIPS)
static __inline int MULSHIFT32(int x, int y)
{
__asm__ volatile (
"mult %0,%1 \n\t"
"mfhi %0"
: "=r" (y)
: "r" (x), "0" (y)
) ;
return y;
}
static __inline int FASTABS(int x)
{
// int t=0; /*Really is not necessary to initialiaze only to avoid warning*/
//
// __asm__ volatile (
// "sra %0, %1, 31 \n\t"
// "xor %1, %1, %0 \n\t"
// "sub %0, %1, %0 \n\t"
// : "=&r" (t)
// : "r" (x)
// );
//
// return t;
/* Commented out the above code as it causes
* problems while decoding some files on
* MIPS M4K core */
return((x > 0) ? x : -(x));
}
static __inline int CLZ(int x)
{
int t=0;
__asm__ volatile (
"clz %0, %1"
: "=&r" (t)
: "r" (x)
);
return t;
}
/* 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
*/
#define Word64 long long
static __inline Word64 MADD64(Word64 sum, int x, int y)
{
return (sum + ((Word64)x * y));
}
static __inline Word64 SHL64(Word64 x, int n)
{
return (x<<n);
}
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;
return (x >> n);
//if (n < 32) {
//} else //if (n < 64) {
/* sar masks cl to 0x1f */
//} else { // n==64
//}
}
#else
#error Unsupported platform in assembly.h
#endif /* platforms */
#endif /* _ASSEMBLY_H */
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发表于 2022-9-18 20:16