?? quantize-pvt.c
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}
#if (defined(__GNUC__) && defined(__i386__))
#define USE_GNUC_ASM
#endif
#ifdef _MSC_VER
#define USE_MSC_ASM
#endif
/*********************************************************************
* XRPOW_FTOI is a macro to convert floats to ints.
* if XRPOW_FTOI(x) = nearest_int(x), then QUANTFAC(x)=adj43asm[x]
* ROUNDFAC= -0.0946
*
* if XRPOW_FTOI(x) = floor(x), then QUANTFAC(x)=asj43[x]
* ROUNDFAC=0.4054
*********************************************************************/
#ifdef USE_GNUC_ASM
# define QUANTFAC(rx) adj43asm[rx]
# define ROUNDFAC -0.0946
# define XRPOW_FTOI(src, dest) \
asm ("fistpl %0 " : "=m"(dest) : "t"(src) : "st")
#elif defined (USE_MSC_ASM)
# define QUANTFAC(rx) adj43asm[rx]
# define ROUNDFAC -0.0946
# define XRPOW_FTOI(src, dest) do { \
FLOAT8 src_ = (src); \
int dest_; \
{ \
__asm fld src_ \
__asm fistp dest_ \
} \
(dest) = dest_; \
} while (0)
#else
# define QUANTFAC(rx) adj43[rx]
# define ROUNDFAC 0.4054
# define XRPOW_FTOI(src,dest) ((dest) = (int)(src))
#endif
#ifdef USE_MSC_ASM
/* define F8type and F8size according to type of FLOAT8 */
# if defined FLOAT8_is_double
# define F8type qword
# define F8size 8
# elif defined FLOAT8_is_float
# define F8type dword
# define F8size 4
# else
/* only float and double supported */
# error invalid FLOAT8 type for USE_MSC_ASM
# endif
#endif
#ifdef USE_GNUC_ASM
/* define F8type and F8size according to type of FLOAT8 */
# if defined FLOAT8_is_double
# define F8type "l"
# define F8size "8"
# elif defined FLOAT8_is_float
# define F8type "s"
# define F8size "4"
# else
/* only float and double supported */
# error invalid FLOAT8 type for USE_GNUC_ASM
# endif
#endif
/*********************************************************************
* nonlinear quantization of xr
* More accurate formula than the ISO formula. Takes into account
* the fact that we are quantizing xr -> ix, but we want ix^4/3 to be
* as close as possible to x^4/3. (taking the nearest int would mean
* ix is as close as possible to xr, which is different.)
* From Segher Boessenkool <segher@eastsite.nl> 11/1999
* ASM optimization from
* Mathew Hendry <scampi@dial.pipex.com> 11/1999
* Acy Stapp <AStapp@austin.rr.com> 11/1999
* Takehiro Tominaga <tominaga@isoternet.org> 11/1999
*********************************************************************/
void quantize_xrpow(FLOAT8 xr[576], int ix[576], gr_info *cod_info) {
/* quantize on xr^(3/4) instead of xr */
const FLOAT8 istep = IPOW20(cod_info->global_gain);
#if defined (USE_GNUC_ASM)
{
int rx[4];
__asm__ __volatile__(
"\n\nloop1:\n\t"
"fld" F8type " 0*" F8size "(%1)\n\t"
"fld" F8type " 1*" F8size "(%1)\n\t"
"fld" F8type " 2*" F8size "(%1)\n\t"
"fld" F8type " 3*" F8size "(%1)\n\t"
"fxch %%st(3)\n\t"
"fmul %%st(4)\n\t"
"fxch %%st(2)\n\t"
"fmul %%st(4)\n\t"
"fxch %%st(1)\n\t"
"fmul %%st(4)\n\t"
"fxch %%st(3)\n\t"
"fmul %%st(4)\n\t"
"addl $4*" F8size ", %1\n\t"
"addl $16, %3\n\t"
"fxch %%st(2)\n\t"
"fistl %5\n\t"
"fxch %%st(1)\n\t"
"fistl 4+%5\n\t"
"fxch %%st(3)\n\t"
"fistl 8+%5\n\t"
"fxch %%st(2)\n\t"
"fistl 12+%5\n\t"
"dec %4\n\t"
"movl %5, %%eax\n\t"
"movl 4+%5, %%ebx\n\t"
"fxch %%st(1)\n\t"
"fadd" F8type " (%2,%%eax," F8size ")\n\t"
"fxch %%st(3)\n\t"
"fadd" F8type " (%2,%%ebx," F8size ")\n\t"
"movl 8+%5, %%eax\n\t"
"movl 12+%5, %%ebx\n\t"
"fxch %%st(2)\n\t"
"fadd" F8type " (%2,%%eax," F8size ")\n\t"
"fxch %%st(1)\n\t"
"fadd" F8type " (%2,%%ebx," F8size ")\n\t"
"fxch %%st(3)\n\t"
"fistpl -16(%3)\n\t"
"fxch %%st(1)\n\t"
"fistpl -12(%3)\n\t"
"fistpl -8(%3)\n\t"
"fistpl -4(%3)\n\t"
"jnz loop1\n\n"
: /* no outputs */
: "t" (istep), "r" (xr), "r" (adj43asm), "r" (ix), "r" (576 / 4), "m" (rx)
: "%eax", "%ebx", "memory", "cc"
);
}
#elif defined (USE_MSC_ASM)
{
/* asm from Acy Stapp <AStapp@austin.rr.com> */
int rx[4];
_asm {
fld F8type ptr [istep]
mov esi, dword ptr [xr]
lea edi, dword ptr [adj43asm]
mov edx, dword ptr [ix]
mov ecx, 576/4
} loop1: _asm {
fld F8type ptr [esi+(0*F8size)] // 0
fld F8type ptr [esi+(1*F8size)] // 1 0
fld F8type ptr [esi+(2*F8size)] // 2 1 0
fld F8type ptr [esi+(3*F8size)] // 3 2 1 0
fxch st(3) // 0 2 1 3
fmul st(0), st(4)
fxch st(2) // 1 2 0 3
fmul st(0), st(4)
fxch st(1) // 2 1 0 3
fmul st(0), st(4)
fxch st(3) // 3 1 0 2
fmul st(0), st(4)
add esi, 4*F8size
add edx, 16
fxch st(2) // 0 1 3 2
fist dword ptr [rx]
fxch st(1) // 1 0 3 2
fist dword ptr [rx+4]
fxch st(3) // 2 0 3 1
fist dword ptr [rx+8]
fxch st(2) // 3 0 2 1
fist dword ptr [rx+12]
dec ecx
mov eax, dword ptr [rx]
mov ebx, dword ptr [rx+4]
fxch st(1) // 0 3 2 1
fadd F8type ptr [edi+eax*F8size]
fxch st(3) // 1 3 2 0
fadd F8type ptr [edi+ebx*F8size]
mov eax, dword ptr [rx+8]
mov ebx, dword ptr [rx+12]
fxch st(2) // 2 3 1 0
fadd F8type ptr [edi+eax*F8size]
fxch st(1) // 3 2 1 0
fadd F8type ptr [edi+ebx*F8size]
fxch st(3) // 0 2 1 3
fistp dword ptr [edx-16] // 2 1 3
fxch st(1) // 1 2 3
fistp dword ptr [edx-12] // 2 3
fistp dword ptr [edx-8] // 3
fistp dword ptr [edx-4]
jnz loop1
mov dword ptr [xr], esi
mov dword ptr [ix], edx
fstp st(0)
}
}
#else
#if 0
{ /* generic code if you write ASM for XRPOW_FTOI() */
FLOAT8 x;
int j, rx;
for (j = 576 / 4; j > 0; --j) {
x = *xr++ * istep;
XRPOW_FTOI(x, rx);
XRPOW_FTOI(x + QUANTFAC(rx), *ix++);
x = *xr++ * istep;
XRPOW_FTOI(x, rx);
XRPOW_FTOI(x + QUANTFAC(rx), *ix++);
x = *xr++ * istep;
XRPOW_FTOI(x, rx);
XRPOW_FTOI(x + QUANTFAC(rx), *ix++);
x = *xr++ * istep;
XRPOW_FTOI(x, rx);
XRPOW_FTOI(x + QUANTFAC(rx), *ix++);
}
}
#endif
{/* from Wilfried.Behne@t-online.de. Reported to be 2x faster than
the above code (when not using ASM) on PowerPC */
int j;
for ( j = 576/8; j > 0; --j)
{
FLOAT8 x1, x2, x3, x4, x5, x6, x7, x8;
int rx1, rx2, rx3, rx4, rx5, rx6, rx7, rx8;
x1 = *xr++ * istep;
x2 = *xr++ * istep;
XRPOW_FTOI(x1, rx1);
x3 = *xr++ * istep;
XRPOW_FTOI(x2, rx2);
x4 = *xr++ * istep;
XRPOW_FTOI(x3, rx3);
x5 = *xr++ * istep;
XRPOW_FTOI(x4, rx4);
x6 = *xr++ * istep;
XRPOW_FTOI(x5, rx5);
x7 = *xr++ * istep;
XRPOW_FTOI(x6, rx6);
x8 = *xr++ * istep;
XRPOW_FTOI(x7, rx7);
x1 += QUANTFAC(rx1);
XRPOW_FTOI(x8, rx8);
x2 += QUANTFAC(rx2);
XRPOW_FTOI(x1,*ix++);
x3 += QUANTFAC(rx3);
XRPOW_FTOI(x2,*ix++);
x4 += QUANTFAC(rx4);
XRPOW_FTOI(x3,*ix++);
x5 += QUANTFAC(rx5);
XRPOW_FTOI(x4,*ix++);
x6 += QUANTFAC(rx6);
XRPOW_FTOI(x5,*ix++);
x7 += QUANTFAC(rx7);
XRPOW_FTOI(x6,*ix++);
x8 += QUANTFAC(rx8);
XRPOW_FTOI(x7,*ix++);
XRPOW_FTOI(x8,*ix++);
}
}
#endif
}
void quantize_xrpow_ISO( FLOAT8 xr[576], int ix[576], gr_info *cod_info )
{
/* quantize on xr^(3/4) instead of xr */
const FLOAT8 istep = IPOW20(cod_info->global_gain);
#if defined(USE_GNUC_ASM)
{
__asm__ __volatile__ (
"\n\nloop0:\n\t"
"fld" F8type " 0*" F8size "(%3)\n\t"
"fld" F8type " 1*" F8size "(%3)\n\t"
"fld" F8type " 2*" F8size "(%3)\n\t"
"fld" F8type " 3*" F8size "(%3)\n\t"
"addl $4*" F8size ", %3\n\t"
"addl $16, %4\n\t"
"fxch %%st(3)\n\t"
"fmul %%st(4)\n\t"
"fxch %%st(2)\n\t"
"fmul %%st(4)\n\t"
"fxch %%st(1)\n\t"
"fmul %%st(4)\n\t"
"fxch %%st(3)\n\t"
"fmul %%st(4)\n\t"
"dec %0\n\t"
"fxch %%st(2)\n\t"
"fadd %%st(5)\n\t"
"fxch %%st(1)\n\t"
"fadd %%st(5)\n\t"
"fxch %%st(3)\n\t"
"fadd %%st(5)\n\t"
"fxch %%st(2)\n\t"
"fadd %%st(5)\n\t"
"fxch %%st(1)\n\t"
"fistpl -16(%4)\n\t"
"fxch %%st(2)\n\t"
"fistpl -12(%4)\n\t"
"fistpl -8(%4)\n\t"
"fistpl -4(%4)\n\t"
"jnz loop0\n\n"
: /* no outputs */
: "r" (576 / 4), "u" ((FLOAT8)(0.4054 - 0.5)), "t" (istep), "r" (xr), "r" (ix)
: "memory", "cc"
);
}
#elif defined(USE_MSC_ASM)
{
/* asm from Acy Stapp <AStapp@austin.rr.com> */
const FLOAT8 temp0 = 0.4054 - 0.5;
_asm {
mov ecx, 576/4;
fld F8type ptr [temp0];
fld F8type ptr [istep];
mov eax, dword ptr [xr];
mov edx, dword ptr [ix];
} loop0: _asm {
fld F8type ptr [eax+0*F8size]; // 0
fld F8type ptr [eax+1*F8size]; // 1 0
fld F8type ptr [eax+2*F8size]; // 2 1 0
fld F8type ptr [eax+3*F8size]; // 3 2 1 0
add eax, 4*F8size;
add edx, 16;
fxch st(3); // 0 2 1 3
fmul st(0), st(4);
fxch st(2); // 1 2 0 3
fmul st(0), st(4);
fxch st(1); // 2 1 0 3
fmul st(0), st(4);
fxch st(3); // 3 1 0 2
fmul st(0), st(4);
dec ecx;
fxch st(2); // 0 1 3 2
fadd st(0), st(5);
fxch st(1); // 1 0 3 2
fadd st(0), st(5);
fxch st(3); // 2 0 3 1
fadd st(0), st(5);
fxch st(2); // 3 0 2 1
fadd st(0), st(5);
fxch st(1); // 0 3 2 1
fistp dword ptr [edx-16]; // 3 2 1
fxch st(2); // 1 2 3
fistp dword ptr [edx-12];
fistp dword ptr [edx-8];
fistp dword ptr [edx-4];
jnz loop0;
mov dword ptr [xr], eax;
mov dword ptr [ix], edx;
fstp st(0);
fstp st(0);
}
}
#else
#if 0
/* generic ASM */
register int j;
for (j=576/4;j>0;j--) {
XRPOW_FTOI(istep * (*xr++) + ROUNDFAC, *ix++);
XRPOW_FTOI(istep * (*xr++) + ROUNDFAC, *ix++);
XRPOW_FTOI(istep * (*xr++) + ROUNDFAC, *ix++);
XRPOW_FTOI(istep * (*xr++) + ROUNDFAC, *ix++);
}
#endif
{
register int j;
const FLOAT8 compareval0 = (1.0 - 0.4054)/istep;
/* depending on architecture, it may be worth calculating a few more compareval's.
eg. compareval1 = (2.0 - 0.4054/istep);
.. and then after the first compare do this ...
if compareval1>*xr then ix = 1;
On a pentium166, it's only worth doing the one compare (as done here), as the second
compare becomes more expensive than just calculating the value. Architectures with
slow FP operations may want to add some more comparevals. try it and send your diffs
statistically speaking
73% of all xr*istep values give ix=0
16% will give 1
4% will give 2
*/
for (j=576;j>0;j--)
{
if (compareval0 > *xr) {
*(ix++) = 0;
xr++;
} else
/* *(ix++) = (int)( istep*(*(xr++)) + 0.4054); */
XRPOW_FTOI( istep*(*(xr++)) + ROUNDFAC , *(ix++) );
}
}
#endif
}
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