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|
/*
* Discrete Cosine Tansform (DCT) for SSE
* Copyright (c) 2006 Zuxy MENG <zuxy.meng@gmail.com>
* based upon code from mp3lib/dct64.c, mp3lib/dct64_altivec.c
* and mp3lib/dct64_MMX.c
*/
/* NOTE: The following code is suboptimal! It can be improved (at least) by
1. Replace all movups by movaps. (Can Parameter c be always aligned on
a 16-byte boundary?)
2. Rewritten using intrinsics. (GCC generally optimizes intrinsics
better. However, when __m128 locals are involved, GCC may
produce bad code that uses movaps to access a stack not aligned
on a 16-byte boundary, which leads to run-time crashes.)
*/
typedef float real;
extern float __attribute__((aligned(16))) costab_mmx[];
static const int ppnn[4] __attribute__((aligned(16))) =
{ 0, 0, 1 << 31, 1 << 31 };
static const int pnpn[4] __attribute__((aligned(16))) =
{ 0, 1 << 31, 0, 1 << 31 };
static const int nnnn[4] __attribute__((aligned(16))) =
{ 1 << 31, 1 << 31, 1 << 31, 1 << 31 };
void dct64_sse(real *a,real *b,real *c)
{
static real __attribute__ ((aligned(16))) b1[0x20];
static real __attribute__ ((aligned(16))) b2[0x20];
static real const one = 1.f;
short *out0 = (short*)a;
short *out1 = (short*)b;
{
real *costab = costab_mmx;
int i;
for (i = 0; i < 0x20 / 2; i += 4)
{
asm(
"movaps %2, %%xmm3\n\t"
"shufps $27, %%xmm3, %%xmm3\n\t"
"movups %3, %%xmm1\n\t"
"movaps %%xmm1, %%xmm4\n\t"
"movups %4, %%xmm2\n\t"
"shufps $27, %%xmm4, %%xmm4\n\t"
"movaps %%xmm2, %%xmm0\n\t"
"shufps $27, %%xmm0, %%xmm0\n\t"
"addps %%xmm0, %%xmm1\n\t"
"movaps %%xmm1, %0\n\t"
"subps %%xmm2, %%xmm4\n\t"
"mulps %%xmm3, %%xmm4\n\t"
"movaps %%xmm4, %1\n\t"
:"=m"(*(b1 + i)), "=m"(*(b1 + 0x1c - i))
:"m"(*(costab + i)), "m"(*(c + i)), "m"(*(c + 0x1c - i))
);
}
}
{
int i;
for (i = 0; i < 0x20; i += 0x10)
{
asm(
"movaps %4, %%xmm1\n\t"
"movaps %5, %%xmm3\n\t"
"movaps %6, %%xmm4\n\t"
"movaps %7, %%xmm6\n\t"
"movaps %%xmm1, %%xmm7\n\t"
"shufps $27, %%xmm7, %%xmm7\n\t"
"movaps %%xmm3, %%xmm5\n\t"
"shufps $27, %%xmm5, %%xmm5\n\t"
"movaps %%xmm4, %%xmm2\n\t"
"shufps $27, %%xmm2, %%xmm2\n\t"
"movaps %%xmm6, %%xmm0\n\t"
"shufps $27, %%xmm0, %%xmm0\n\t"
"addps %%xmm0, %%xmm1\n\t"
"movaps %%xmm1, %0\n\t"
"addps %%xmm2, %%xmm3\n\t"
"movaps %%xmm3, %1\n\t"
"subps %%xmm4, %%xmm5\n\t"
"movaps %%xmm5, %2\n\t"
"subps %%xmm6, %%xmm7\n\t"
"movaps %%xmm7, %3\n\t"
:"=m"(*(b2 + i)), "=m"(*(b2 + i + 4)), "=m"(*(b2 + i + 8)), "=m"(*(b2 + i + 12))
:"m"(*(b1 + i)), "m"(*(b1 + i + 4)), "m"(*(b1 + i + 8)), "m"(*(b1 + i + 12))
);
}
}
{
real *costab = costab_mmx + 16;
asm(
"movaps %4, %%xmm0\n\t"
"movaps %5, %%xmm1\n\t"
"movaps %8, %%xmm4\n\t"
"xorps %%xmm6, %%xmm6\n\t"
"shufps $27, %%xmm4, %%xmm4\n\t"
"mulps %%xmm4, %%xmm1\n\t"
"movaps %9, %%xmm2\n\t"
"xorps %%xmm7, %%xmm7\n\t"
"shufps $27, %%xmm2, %%xmm2\n\t"
"mulps %%xmm2, %%xmm0\n\t"
"movaps %%xmm0, %0\n\t"
"movaps %%xmm1, %1\n\t"
"movaps %6, %%xmm3\n\t"
"mulps %%xmm2, %%xmm3\n\t"
"subps %%xmm3, %%xmm6\n\t"
"movaps %%xmm6, %2\n\t"
"movaps %7, %%xmm5\n\t"
"mulps %%xmm4, %%xmm5\n\t"
"subps %%xmm5, %%xmm7\n\t"
"movaps %%xmm7, %3\n\t"
:"=m"(*(b2 + 8)), "=m"(*(b2 + 0xc)), "=m"(*(b2 + 0x18)), "=m"(*(b2 + 0x1c))
:"m"(*(b2 + 8)), "m"(*(b2 + 0xc)), "m"(*(b2 + 0x18)), "m"(*(b2 + 0x1c)), "m"(*costab), "m"(*(costab + 4))
);
}
{
real *costab = costab_mmx + 24;
int i;
asm(
"movaps %0, %%xmm0\n\t"
"shufps $27, %%xmm0, %%xmm0\n\t"
"movaps %1, %%xmm5\n\t"
"movaps %%xmm5, %%xmm6\n\t"
:
:"m"(*costab), "m"(*nnnn)
);
for (i = 0; i < 0x20; i += 8)
{
asm(
"movaps %2, %%xmm2\n\t"
"movaps %3, %%xmm3\n\t"
"movaps %%xmm2, %%xmm4\n\t"
"xorps %%xmm5, %%xmm6\n\t"
"shufps $27, %%xmm4, %%xmm4\n\t"
"movaps %%xmm3, %%xmm1\n\t"
"shufps $27, %%xmm1, %%xmm1\n\t"
"addps %%xmm1, %%xmm2\n\t"
"movaps %%xmm2, %0\n\t"
"subps %%xmm3, %%xmm4\n\t"
"xorps %%xmm6, %%xmm4\n\t"
"mulps %%xmm0, %%xmm4\n\t"
"movaps %%xmm4, %1\n\t"
:"=m"(*(b1 + i)), "=m"(*(b1 + i + 4))
:"m"(*(b2 + i)), "m"(*(b2 + i + 4))
);
}
}
{
int i;
asm(
"movss %0, %%xmm1\n\t"
"movss %1, %%xmm0\n\t"
"movaps %%xmm1, %%xmm3\n\t"
"unpcklps %%xmm0, %%xmm3\n\t"
"movss %2, %%xmm2\n\t"
"movaps %%xmm1, %%xmm0\n\t"
"unpcklps %%xmm2, %%xmm0\n\t"
"unpcklps %%xmm3, %%xmm0\n\t"
"movaps %3, %%xmm2\n\t"
:
:"m"(one), "m"(costab_mmx[28]), "m"(costab_mmx[29]), "m"(*ppnn)
);
for (i = 0; i < 0x20; i += 8)
{
asm(
"movaps %2, %%xmm3\n\t"
"movaps %%xmm3, %%xmm4\n\t"
"shufps $20, %%xmm4, %%xmm4\n\t"
"shufps $235, %%xmm3, %%xmm3\n\t"
"xorps %%xmm2, %%xmm3\n\t"
"addps %%xmm3, %%xmm4\n\t"
"mulps %%xmm0, %%xmm4\n\t"
"movaps %%xmm4, %0\n\t"
"movaps %3, %%xmm6\n\t"
"movaps %%xmm6, %%xmm5\n\t"
"shufps $27, %%xmm5, %%xmm5\n\t"
"xorps %%xmm2, %%xmm5\n\t"
"addps %%xmm5, %%xmm6\n\t"
"mulps %%xmm0, %%xmm6\n\t"
"movaps %%xmm6, %1\n\t"
:"=m"(*(b2 + i)), "=m"(*(b2 + i + 4))
:"m"(*(b1 + i)), "m"(*(b1 + i + 4))
);
}
}
{
int i;
asm(
"movss %0, %%xmm0\n\t"
"movaps %%xmm1, %%xmm2\n\t"
"movaps %%xmm0, %%xmm7\n\t"
"unpcklps %%xmm1, %%xmm2\n\t"
"unpcklps %%xmm0, %%xmm7\n\t"
"movaps %1, %%xmm0\n\t"
"unpcklps %%xmm7, %%xmm2\n\t"
:
:"m"(costab_mmx[30]), "m"(*pnpn)
);
for (i = 0x8; i < 0x20; i += 8)
{
asm volatile (
"movaps %2, %%xmm1\n\t"
"movaps %%xmm1, %%xmm3\n\t"
"shufps $224, %%xmm3, %%xmm3\n\t"
"shufps $181, %%xmm1, %%xmm1\n\t"
"xorps %%xmm0, %%xmm1\n\t"
"addps %%xmm1, %%xmm3\n\t"
"mulps %%xmm2, %%xmm3\n\t"
"movaps %%xmm3, %0\n\t"
"movaps %3, %%xmm4\n\t"
"movaps %%xmm4, %%xmm5\n\t"
"shufps $224, %%xmm5, %%xmm5\n\t"
"shufps $181, %%xmm4, %%xmm4\n\t"
"xorps %%xmm0, %%xmm4\n\t"
"addps %%xmm4, %%xmm5\n\t"
"mulps %%xmm2, %%xmm5\n\t"
"movaps %%xmm5, %1\n\t"
:"=m"(*(b1 + i)), "=m"(*(b1 + i + 4))
:"m"(*(b2 + i)), "m"(*(b2 + i + 4))
:"memory"
);
}
for (i = 0x8; i < 0x20; i += 8)
{
b1[i + 2] += b1[i + 3];
b1[i + 6] += b1[i + 7];
b1[i + 4] += b1[i + 6];
b1[i + 6] += b1[i + 5];
b1[i + 5] += b1[i + 7];
}
}
#if 0
/* Reference C code */
/*
Should run faster than x87 asm, given that the compiler is sane.
However, the C code dosen't round with saturation (0x7fff for too
large positive float, 0x8000 for too small negative float). You
can hear the difference if you listen carefully.
*/
out0[256] = (short)(b2[0] + b2[1]);
out0[0] = (short)((b2[0] - b2[1]) * costab_mmx[30]);
out1[128] = (short)((b2[3] - b2[2]) * costab_mmx[30]);
out0[128] = (short)((b2[3] - b2[2]) * costab_mmx[30] + b2[3] + b2[2]);
out1[192] = (short)((b2[7] - b2[6]) * costab_mmx[30]);
out0[192] = (short)((b2[7] - b2[6]) * costab_mmx[30] + b2[6] + b2[7] + b2[4] + b2[5]);
out0[64] = (short)((b2[7] - b2[6]) * costab_mmx[30] + b2[6] + b2[7] + (b2[4] - b2[5]) * costab_mmx[30]);
out1[64] = (short)((b2[7] - b2[6]) * costab_mmx[30] + (b2[4] - b2[5]) * costab_mmx[30]);
out0[224] = (short)(b1[8] + b1[12]);
out0[160] = (short)(b1[12] + b1[10]);
out0[96] = (short)(b1[10] + b1[14]);
out0[32] = (short)(b1[14] + b1[9]);
out1[32] = (short)(b1[9] + b1[13]);
out1[96] = (short)(b1[13] + b1[11]);
out1[224] = (short)b1[15];
out1[160] = (short)(b1[15] + b1[11]);
out0[240] = (short)(b1[24] + b1[28] + b1[16]);
out0[208] = (short)(b1[24] + b1[28] + b1[20]);
out0[176] = (short)(b1[28] + b1[26] + b1[20]);
out0[144] = (short)(b1[28] + b1[26] + b1[18]);
out0[112] = (short)(b1[26] + b1[30] + b1[18]);
out0[80] = (short)(b1[26] + b1[30] + b1[22]);
out0[48] = (short)(b1[30] + b1[25] + b1[22]);
out0[16] = (short)(b1[30] + b1[25] + b1[17]);
out1[16] = (short)(b1[25] + b1[29] + b1[17]);
out1[48] = (short)(b1[25] + b1[29] + b1[21]);
out1[80] = (short)(b1[29] + b1[27] + b1[21]);
out1[112] = (short)(b1[29] + b1[27] + b1[19]);
out1[144] = (short)(b1[27] + b1[31] + b1[19]);
out1[176] = (short)(b1[27] + b1[31] + b1[23]);
out1[240] = (short)(b1[31]);
out1[208] = (short)(b1[31] + b1[23]);
#else
/*
To do saturation efficiently in x86 we can use fist(t)(p),
pf2iw, or packssdw. We use fist(p) here.
*/
asm(
"flds %0\n\t"
"flds (%2)\n\t"
"fadds 4(%2)\n\t"
"fistp 512(%3)\n\t"
"flds (%2)\n\t"
"fsubs 4(%2)\n\t"
"fmul %%st(1)\n\t"
"fistp (%3)\n\t"
"flds 12(%2)\n\t"
"fsubs 8(%2)\n\t"
"fmul %%st(1)\n\t"
"fist 256(%4)\n\t"
"fadds 12(%2)\n\t"
"fadds 8(%2)\n\t"
"fistp 256(%3)\n\t"
"flds 16(%2)\n\t"
"fsubs 20(%2)\n\t"
"fmul %%st(1)\n\t"
"flds 28(%2)\n\t"
"fsubs 24(%2)\n\t"
"fmul %%st(2)\n\t"
"fist 384(%4)\n\t"
"fld %%st(0)\n\t"
"fadds 24(%2)\n\t"
"fadds 28(%2)\n\t"
"fld %%st(0)\n\t"
"fadds 16(%2)\n\t"
"fadds 20(%2)\n\t"
"fistp 384(%3)\n\t"
"fadd %%st(2)\n\t"
"fistp 128(%3)\n\t"
"faddp %%st(1)\n\t"
"fistp 128(%4)\n\t"
"flds 32(%1)\n\t"
"fadds 48(%1)\n\t"
"fistp 448(%3)\n\t"
"flds 48(%1)\n\t"
"fadds 40(%1)\n\t"
"fistp 320(%3)\n\t"
"flds 40(%1)\n\t"
"fadds 56(%1)\n\t"
"fistp 192(%3)\n\t"
"flds 56(%1)\n\t"
"fadds 36(%1)\n\t"
"fistp 64(%3)\n\t"
"flds 36(%1)\n\t"
"fadds 52(%1)\n\t"
"fistp 64(%4)\n\t"
"flds 52(%1)\n\t"
"fadds 44(%1)\n\t"
"fistp 192(%4)\n\t"
"flds 60(%1)\n\t"
"fist 448(%4)\n\t"
"fadds 44(%1)\n\t"
"fistp 320(%4)\n\t"
"flds 96(%1)\n\t"
"fadds 112(%1)\n\t"
"fld %%st(0)\n\t"
"fadds 64(%1)\n\t"
"fistp 480(%3)\n\t"
"fadds 80(%1)\n\t"
"fistp 416(%3)\n\t"
"flds 112(%1)\n\t"
"fadds 104(%1)\n\t"
"fld %%st(0)\n\t"
"fadds 80(%1)\n\t"
"fistp 352(%3)\n\t"
"fadds 72(%1)\n\t"
"fistp 288(%3)\n\t"
"flds 104(%1)\n\t"
"fadds 120(%1)\n\t"
"fld %%st(0)\n\t"
"fadds 72(%1)\n\t"
"fistp 224(%3)\n\t"
"fadds 88(%1)\n\t"
"fistp 160(%3)\n\t"
"flds 120(%1)\n\t"
"fadds 100(%1)\n\t"
"fld %%st(0)\n\t"
"fadds 88(%1)\n\t"
"fistp 96(%3)\n\t"
"fadds 68(%1)\n\t"
"fistp 32(%3)\n\t"
"flds 100(%1)\n\t"
"fadds 116(%1)\n\t"
"fld %%st(0)\n\t"
"fadds 68(%1)\n\t"
"fistp 32(%4)\n\t"
"fadds 84(%1)\n\t"
"fistp 96(%4)\n\t"
"flds 116(%1)\n\t"
"fadds 108(%1)\n\t"
"fld %%st(0)\n\t"
"fadds 84(%1)\n\t"
"fistp 160(%4)\n\t"
"fadds 76(%1)\n\t"
"fistp 224(%4)\n\t"
"flds 108(%1)\n\t"
"fadds 124(%1)\n\t"
"fld %%st(0)\n\t"
"fadds 76(%1)\n\t"
"fistp 288(%4)\n\t"
"fadds 92(%1)\n\t"
"fistp 352(%4)\n\t"
"flds 124(%1)\n\t"
"fist 480(%4)\n\t"
"fadds 92(%1)\n\t"
"fistp 416(%4)\n\t"
".byte 0xdf, 0xc0\n\t" // ffreep %%st(0)
:
:"m"(costab_mmx[30]), "r"(b1), "r"(b2), "r"(a), "r"(b)
:"memory"
);
#endif
out1[0] = out0[0];
}
|
