[Bug 693502] Re: gromacs ns.c miscompiled on armel with -O1 -fcse-follow-jumps -finline-small-functions

[Matthias Klose]

fixed in natty

** Changed in: gcc-4.5 (Ubuntu)
       Status: New => Fix Released

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Title:
  gromacs ns.c miscompiled on armel with -O1 -fcse-follow-jumps
  -finline-small-functions

Status in The GNU Compiler Collection:
  Fix Released
Status in Linaro GCC:
  Fix Released
Status in Linaro GCC Tracking:
  Fix Released
Status in “gcc-4.5” package in Ubuntu:
  Fix Released

Bug description:
  Gromacs (as included in the SPEC2006 benchmark) fails with the error:

  Fatal error: One of the box vectors has become shorter than twice the
  cut-off length.

  when built with -O2 but works with -O1; I've followed it down to
  -O1 -fcse-follow-jumps -finline-small-functions failing, which seems to be the minimal set and this is the
  ns.c file of Gromacs that needs those options to fail.

  Dave

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