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opus: speed up mdct overlap add and copying

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Unroll overlap add loop by four and use memcpy for copying
instead of loops.

Change-Id: I17114626a395d5972130251d892f851bc86e3a6a
Signed-off-by: Nils Wallménius <nils@rockbox.org>
This commit is contained in:
Andree Buschmann 2012-10-07 00:29:21 +02:00 • committed by Nils Wallménius
parent 3ac0fc7c90
commit c7840e745e
1 changed files with 10 additions and 6 deletions
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16
lib/rbcodec/codecs/libopus/celt/celt.c
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@ -448,12 +448,16 @@ static void compute_inv_mdcts(const CELTMode *mode, int shortBlocks, celt_sig *X
clt_mdct_backward(&mode->mdct, &X[b+c*N2*B], x+N2*b, mode->window, overlap, shortBlocks ? mode->maxLM : mode->maxLM-LM, B);
}
for (j=0;j<overlap;j++)
out_mem[c][j] = x[j] + overlap_mem[c][j];
for (;j<N;j++)
out_mem[c][j] = x[j];
for (j=0;j<overlap;j++)
overlap_mem[c][j] = x[N+j];
/* overlap can be divided by 4 */
for (j=0;j<overlap;j+=4)
{
out_mem[c][j ] = x[j ] + overlap_mem[c][j ];
out_mem[c][j+1] = x[j+1] + overlap_mem[c][j+1];
out_mem[c][j+2] = x[j+2] + overlap_mem[c][j+2];
out_mem[c][j+3] = x[j+3] + overlap_mem[c][j+3];
}
OPUS_COPY(out_mem[c]+overlap, x+overlap, N-overlap);
OPUS_COPY(overlap_mem[c] , x+N , overlap);
} while (++c<C);
RESTORE_STACK;
}