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author | Jean-Marc Valin <jmvalin@jmvalin.ca> | 2014-01-07 16:26:27 -0500 |
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committer | Jean-Marc Valin <jmvalin@jmvalin.ca> | 2014-01-07 16:26:27 -0500 |
commit | 81af25950f061aa18339c23ae07846d72a49e3d3 (patch) | |
tree | a1b3ccfefbdd36cdddb9c5a008bd8dc58e3dd5a8 /silk/PLC.c | |
parent | e17ca25617009ce0ec7701c08bdb0e367da94ca0 (diff) | |
download | opus-81af25950f061aa18339c23ae07846d72a49e3d3.tar.gz |
Another aliasing hack in the SILK PLC with SMALL_FOOTPRINT
Diffstat (limited to 'silk/PLC.c')
-rw-r--r-- | silk/PLC.c | 11 |
1 files changed, 10 insertions, 1 deletions
@@ -181,15 +181,24 @@ static OPUS_INLINE void silk_PLC_conceal( opus_int32 *sLPC_Q14_ptr; VARDECL( opus_int16, exc_buf ); opus_int16 A_Q12[ MAX_LPC_ORDER ]; +#ifdef SMALL_FOOTPRINT + opus_int16 *sLTP; +#else VARDECL( opus_int16, sLTP ); +#endif VARDECL( opus_int32, sLTP_Q14 ); silk_PLC_struct *psPLC = &psDec->sPLC; opus_int32 prevGain_Q10[2]; SAVE_STACK; ALLOC( exc_buf, 2*psPLC->subfr_length, opus_int16 ); - ALLOC( sLTP, psDec->ltp_mem_length, opus_int16 ); ALLOC( sLTP_Q14, psDec->ltp_mem_length + psDec->frame_length, opus_int32 ); +#ifdef SMALL_FOOTPRINT + /* Ugly hack that breaks aliasing rules to save stack: put sLTP at the very end of sLTP_Q14. */ + sLTP = ((opus_int16*)&sLTP_Q14[psDec->ltp_mem_length + psDec->frame_length])-psDec->ltp_mem_length; +#else + ALLOC( sLTP, psDec->ltp_mem_length, opus_int16 ); +#endif prevGain_Q10[0] = silk_RSHIFT( psPLC->prevGain_Q16[ 0 ], 6); prevGain_Q10[1] = silk_RSHIFT( psPLC->prevGain_Q16[ 1 ], 6); |