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some SSE optimizations 

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@3509 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
michael 2001-12-15 23:26:52 +00:00
parent a415880927
commit bd695cbb5c
1 changed files with 65 additions and 1 deletions
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66
liba52/imdct.c
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@ -72,7 +72,12 @@ static uint8_t bit_reverse_256[] = {
0x03, 0x23, 0x13, 0x33, 0x0b, 0x2b, 0x1b, 0x3b,
0x07, 0x27, 0x17, 0x37, 0x0f, 0x2f, 0x1f, 0x3f};
#ifdef HAVE_SSE
// NOTE: SSE needs 16byte alignment or it will segfault
static complex_t __attribute__((aligned(16))) buf[128];
#else
static complex_t buf[128];
#endif
/* Twiddle factor LUT */
static complex_t w_1[1];
@ -182,6 +187,64 @@ imdct_do_512(sample_t data[],sample_t delay[], sample_t bias)
}
/* FFT Merge */
#ifdef HAVE_SSE
// Note w[0][0]={1,0}
// C Code for the following asm loop
/* for(i = 0; i < 128; i += 2) {
p = 0 + i;
q = p + 1;
tmp_a_r = buf[p].real;
tmp_a_i = buf[p].imag;
tmp_b_r = buf[q].real;
tmp_b_i = buf[q].imag;
buf[p].real = tmp_a_r + tmp_b_r;
buf[p].imag = tmp_a_i + tmp_b_i;
buf[q].real = tmp_a_r - tmp_b_r;
buf[q].imag = tmp_a_i - tmp_b_i;
}*/
asm volatile(
"xorps %%xmm1, %%xmm1 \n\t"
"xorps %%xmm2, %%xmm2 \n\t"
"movl %0, %%esi \n\t"
"1: \n\t"
"movlps (%%esi), %%xmm0 \n\t" //buf[p]
"movlps 8(%%esi), %%xmm1\n\t" //buf[q]
"movhps (%%esi), %%xmm0 \n\t" //buf[p]
"movhps 8(%%esi), %%xmm2\n\t" //buf[q]
"addps %%xmm1, %%xmm0 \n\t"
"subps %%xmm2, %%xmm0 \n\t"
"movaps %%xmm0, (%%esi) \n\t"
"addl $16, %%esi \n\t"
"cmpl %1, %%esi \n\t"
" jb 1b \n\t"
:: "g" (buf), "r" (buf + 128)
: "%esi"
);
for (m=1; m < 7; m++) {
if(m)
two_m = (1 << m);
else
two_m = 1;
two_m_plus_one = (1 << (m+1));
for(k = 0; k < two_m; k++) {
for(i = 0; i < 128; i += two_m_plus_one) {
p = k + i;
q = p + two_m;
tmp_a_r = buf[p].real;
tmp_a_i = buf[p].imag;
tmp_b_r = buf[q].real * w[m][k].real - buf[q].imag * w[m][k].imag;
tmp_b_i = buf[q].imag * w[m][k].real + buf[q].real * w[m][k].imag;
buf[p].real = tmp_a_r + tmp_b_r;
buf[p].imag = tmp_a_i + tmp_b_i;
buf[q].real = tmp_a_r - tmp_b_r;
buf[q].imag = tmp_a_i - tmp_b_i;
}
}
}
#else
for (m=0; m < 7; m++) {
if(m)
two_m = (1 << m);
@ -205,7 +268,8 @@ imdct_do_512(sample_t data[],sample_t delay[], sample_t bias)
}
}
}
#endif
/* Post IFFT complex multiply plus IFFT complex conjugate*/
for( i=0; i < 128; i++) {
/* y[n] = z[n] * (xcos1[n] + j * xsin1[n]) ; */