[Bug tree-optimization/43716] [4.6/4.7/4.8 Regression] Revision 158105 miscompiles doduc.f90

["ubizjak at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43716

--- Comment #32 from Uros Bizjak <ubizjak at gmail dot com> 2012-07-21 10:49:31 UTC ---
gcc version 4.8.0 20120720 (experimental) [trunk revision 189718] (GCC)

==2822== Memcheck, a memory error detector
==2822== Copyright (C) 2002-2011, and GNU GPL'd, by Julian Seward et al.
==2822== Using Valgrind-3.7.0 and LibVEX; rerun with -h for copyright info
==2822== Command: ./a.out
==2822== 
 MAIN : FIN S00002
 MAIN : FIN S00001
 MAIN : FIN S00011
 MAIN : FIN S00022
 TEMPS =     33.00000000 , NITERA :          1
 TEMPS =     34.00031044 , NITERA :        186
 TEMPS =     35.00497388 , NITERA :        955
 TEMPS =     36.00007615 , NITERA :       1512
 TEMPS =     37.00012624 , NITERA :       1765
 TEMPS =     38.00060760 , NITERA :       2044
 TEMPS =     39.00312223 , NITERA :       2327
 TEMPS =     40.00168143 , NITERA :       2607
 TEMPS =     45.00187475 , NITERA :       4017
 TEMPS =     50.00261983 , NITERA :       5492
 TEMPS =     55.00263522 , NITERA :       6981
 TEMPS =     60.00087007 , NITERA :       8679
==2822== Invalid read of size 8
==2822==    at 0x4040E8: s00061_ (doduc.f90:568)
==2822==    by 0x412AD3: s00013_ (doduc.f90:1150)
==2822==    by 0x41B9D4: MAIN__ (doduc.f90:182)
==2822==    by 0x400B4C: main (doduc.f90:199)
==2822==  Address 0x3fefff770 is not stack'd, malloc'd or (recently) free'd
==2822==

I can reproduce it here with Rev. 189737; it also crashes without running
valgrind.

It crashes (on x86-64 openSUSE Factory) with
  -O3 -ffast-math [-g]

It does not crash with either of the following added:
  -fno-fast-math
  -fno-inline-functions
  -fno-predictive-commoning
  -fno-tree-vectorize

  -fno-protect-parens  (implied by -Ofast)

Nor does it crash with:
  -O2 -ftree-vectorize -finline-functions -ffpredictive-commoning -ffast-math
  -m32 -O3 -ffast-math