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opus: put frequently used mdct buffer on the real stack which is in iram

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Saves about 30MHz on h300 (cf) and 1.5MHz on c200 (pp) decoding a
64kbps test file. Stack usage is still below 70%.

Change-Id: Ib13df9011adb4eef4bb91a52e5a32741c8bf8988
This commit is contained in:
Nils Wallménius 2012-09-26 11:54:03 +02:00
parent 425725edb0
commit f636aa07df
1 changed files with 4 additions and 3 deletions
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7
lib/rbcodec/codecs/libopus/celt/mdct.c
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@ -214,14 +214,15 @@ void clt_mdct_backward(const mdct_lookup *l, kiss_fft_scalar *in, kiss_fft_scala
int i;
int N, N2, N4;
kiss_twiddle_scalar sine;
VARDECL(kiss_fft_scalar, f);
/* VARDECL(kiss_fft_scalar, f); */
VARDECL(kiss_fft_scalar, f2);
SAVE_STACK;
N = l->n;
N = l->n; /* static modes => N = 1920 */
N >>= shift;
N2 = N>>1;
N4 = N>>2;
ALLOC(f, N2, kiss_fft_scalar);
/* ALLOC(f, N2, kiss_fft_scalar); */
kiss_fft_scalar f[N2]; /* worst case 3840b */
ALLOC(f2, N2, kiss_fft_scalar);
/* sin(x) ~= x here */
#ifdef FIXED_POINT