[Bug 1520539] Re: compiler ICE when building libtheora on s390x

[Dimitri John Ledkov]

** Changed in: gcc-5 (Ubuntu)
       Status: New => Invalid

** Changed in: libtheora (Ubuntu)
       Status: New => Fix Released

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Title:
  compiler ICE when building libtheora on s390x

Status in gcc-5 package in Ubuntu:
  Invalid
Status in libtheora package in Ubuntu:
  Fix Released

Bug description:
  5.2.1-22ubuntu2
  s390x
  wily

  Good:
  gcc -DHAVE_CONFIG_H -I. -I.. -I../include -g -O0 -c decode.c  -fPIC -DPIC -o .libs/decode.o

  ICE:
  gcc -DHAVE_CONFIG_H -I. -I.. -I../include -g -O1 -c decode.c  -fPIC -DPIC -o .libs/decode.o

  Output of ICE:
  decode.c: In function 'th_decode_alloc':
  decode.c:400:49: warning: iteration 2u invokes undefined behavior [-Waggressive-loop-optimizations]
         qsum+=_dec->state.dequant_tables[qti][pli][qi][12]+
                                                   ^
  decode.c:396:3: note: containing loop
     for(qi=0;qi<64;qi++){
     ^
  decode.c: In function 'th_decode_packetin':
  decode.c:2289:1: internal compiler error: in s390_emit_compare, at config/s390/s390.c:1732
   }
   ^
  Please submit a full bug report,
  with preprocessed source if appropriate.
  See <file:///usr/share/doc/gcc-5/README.Bugs> for instructions.

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