#include "config.h"
#include "libavutil/attributes.h"
+#include "libavutil/intfloat.h"
#include "sbrdsp.h"
static void sbr_sum64x5_c(float *z)
static float sbr_sum_square_c(float (*x)[2], int n)
{
- float sum = 0.0f;
+ float sum0 = 0.0f, sum1 = 0.0f;
int i;
- for (i = 0; i < n; i++)
- sum += x[i][0] * x[i][0] + x[i][1] * x[i][1];
+ for (i = 0; i < n; i += 2)
+ {
+ sum0 += x[i + 0][0] * x[i + 0][0];
+ sum1 += x[i + 0][1] * x[i + 0][1];
+ sum0 += x[i + 1][0] * x[i + 1][0];
+ sum1 += x[i + 1][1] * x[i + 1][1];
+ }
- return sum;
+ return sum0 + sum1;
}
static void sbr_neg_odd_64_c(float *x)
{
+ union av_intfloat32 *xi = (union av_intfloat32*) x;
int i;
- for (i = 1; i < 64; i += 2)
- x[i] = -x[i];
+ for (i = 1; i < 64; i += 4) {
+ xi[i + 0].i ^= 1U << 31;
+ xi[i + 2].i ^= 1U << 31;
+ }
}
static void sbr_qmf_pre_shuffle_c(float *z)
{
+ union av_intfloat32 *zi = (union av_intfloat32*) z;
int k;
- z[64] = z[0];
- z[65] = z[1];
- for (k = 1; k < 32; k++) {
- z[64+2*k ] = -z[64 - k];
- z[64+2*k+1] = z[ k + 1];
+ zi[64].i = zi[0].i;
+ zi[65].i = zi[1].i;
+ for (k = 1; k < 31; k += 2) {
+ zi[64 + 2 * k + 0].i = zi[64 - k].i ^ (1U << 31);
+ zi[64 + 2 * k + 1].i = zi[ k + 1].i;
+ zi[64 + 2 * k + 2].i = zi[63 - k].i ^ (1U << 31);
+ zi[64 + 2 * k + 3].i = zi[ k + 2].i;
}
+ zi[64 + 2 * 31 + 0].i = zi[64 - 31].i ^ (1U << 31);
+ zi[64 + 2 * 31 + 1].i = zi[31 + 1].i;
}
static void sbr_qmf_post_shuffle_c(float W[32][2], const float *z)
{
+ const union av_intfloat32 *zi = (const union av_intfloat32*) z;
+ union av_intfloat32 *Wi = (union av_intfloat32*) W;
int k;
- for (k = 0; k < 32; k++) {
- W[k][0] = -z[63-k];
- W[k][1] = z[k];
+ for (k = 0; k < 32; k += 2) {
+ Wi[2 * k + 0].i = zi[63 - k].i ^ (1U << 31);
+ Wi[2 * k + 1].i = zi[ k + 0].i;
+ Wi[2 * k + 2].i = zi[62 - k].i ^ (1U << 31);
+ Wi[2 * k + 3].i = zi[ k + 1].i;
}
}
static void sbr_qmf_deint_neg_c(float *v, const float *src)
{
+ const union av_intfloat32 *si = (const union av_intfloat32*)src;
+ union av_intfloat32 *vi = (union av_intfloat32*)v;
int i;
for (i = 0; i < 32; i++) {
- v[ i] = src[63 - 2*i ];
- v[63 - i] = -src[63 - 2*i - 1];
+ vi[ i].i = si[63 - 2 * i ].i;
+ vi[63 - i].i = si[63 - 2 * i - 1].i ^ (1U << 31);
}
}
static void sbr_autocorrelate_c(const float x[40][2], float phi[3][2][2])
{
+#if 0
+ /* This code is slower because it multiplies memory accesses.
+ * It is left for educational purposes and because it may offer
+ * a better reference for writing arch-specific DSP functions. */
autocorrelate(x, phi, 0);
autocorrelate(x, phi, 1);
autocorrelate(x, phi, 2);
+#else
+ float real_sum2 = x[0][0] * x[2][0] + x[0][1] * x[2][1];
+ float imag_sum2 = x[0][0] * x[2][1] - x[0][1] * x[2][0];
+ float real_sum1 = 0.0f, imag_sum1 = 0.0f, real_sum0 = 0.0f;
+ int i;
+ for (i = 1; i < 38; i++) {
+ real_sum0 += x[i][0] * x[i ][0] + x[i][1] * x[i ][1];
+ real_sum1 += x[i][0] * x[i + 1][0] + x[i][1] * x[i + 1][1];
+ imag_sum1 += x[i][0] * x[i + 1][1] - x[i][1] * x[i + 1][0];
+ real_sum2 += x[i][0] * x[i + 2][0] + x[i][1] * x[i + 2][1];
+ imag_sum2 += x[i][0] * x[i + 2][1] - x[i][1] * x[i + 2][0];
+ }
+ phi[2 - 2][1][0] = real_sum2;
+ phi[2 - 2][1][1] = imag_sum2;
+ phi[2 ][1][0] = real_sum0 + x[ 0][0] * x[ 0][0] + x[ 0][1] * x[ 0][1];
+ phi[1 ][0][0] = real_sum0 + x[38][0] * x[38][0] + x[38][1] * x[38][1];
+ phi[2 - 1][1][0] = real_sum1 + x[ 0][0] * x[ 1][0] + x[ 0][1] * x[ 1][1];
+ phi[2 - 1][1][1] = imag_sum1 + x[ 0][0] * x[ 1][1] - x[ 0][1] * x[ 1][0];
+ phi[0 ][0][0] = real_sum1 + x[38][0] * x[39][0] + x[38][1] * x[39][1];
+ phi[0 ][0][1] = imag_sum1 + x[38][0] * x[39][1] - x[38][1] * x[39][0];
+#endif
}
static void sbr_hf_gen_c(float (*X_high)[2], const float (*X_low)[2],
if (ARCH_ARM)
ff_sbrdsp_init_arm(s);
- if (HAVE_MMX)
+ if (ARCH_X86)
ff_sbrdsp_init_x86(s);
}