diff options
| author | Andree Buschmann <AndreeBuschmann@t-online.de> | 2012-10-07 00:29:21 +0200 |
|---|---|---|
| committer | Nils Wallménius <nils@rockbox.org> | 2012-10-07 00:31:08 +0200 |
| commit | c7840e745e9359f8210e5112bef388c4e3157765 (patch) | |
| tree | 3e8df57a58db74c2ae0e9a39053ed8bfe6ed494f /lib/rbcodec/codecs | |
| parent | 3ac0fc7c907695d72f58c41907cef913cf81561f (diff) | |
opus: speed up mdct overlap add and copying
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>
Diffstat (limited to 'lib/rbcodec/codecs')
| -rw-r--r-- | lib/rbcodec/codecs/libopus/celt/celt.c | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/lib/rbcodec/codecs/libopus/celt/celt.c b/lib/rbcodec/codecs/libopus/celt/celt.c index 4a09cc9905..52a66d1b68 100644 --- a/lib/rbcodec/codecs/libopus/celt/celt.c +++ b/lib/rbcodec/codecs/libopus/celt/celt.c @@ -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; } |