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  • #2326

Closed
Open
Opened Jun 14, 2020 by Ralph Giles@rillianOwner

undefined behavior in silk_NSQ_del_dec_neon

Compiling for aarch64 with gcc 9.3.0, I get an undefined behaviour warning:

silk/arm/NSQ_del_dec_neon_intr.c: In function ‘silk_NSQ_del_dec_neon’:
silk/arm/NSQ_del_dec_neon_intr.c:422:55: warning: iteration 80 invokes undefined behavior [-Waggressive-loop-optimizations]
  422 |           NSQ->sLPC_Q14[ i ] = psDelDec->sLPC_Q14[ i ][ Winner_ind ];
      |                                ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~
silk/arm/NSQ_del_dec_neon_intr.c:421:9: note: within this loop
  421 |         for( ; i < NSQ_LPC_BUF_LENGTH; i++ ) {
      |         ^~~
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Reference: xiph/opus#2326