[Bug c/83390] valgrind error in lra_eliminate_regs_1

["vmakarov at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83390

--- Comment #8 from Vladimir Makarov <vmakarov at gcc dot gnu.org> ---
(In reply to David Binderman from comment #0)
> A build of today's gcc trunk with valgrind produces this:
> 
> ==8995== Conditional jump or move depends on uninitialised value(s)
> ==8995==    at 0xA39BBE: lra_eliminate_regs_1 (lra-eliminations.c:403)
> ==8995==    by 0xA39BBE: eliminate_regs_in_insn(rtx_insn*, bool, bool, long)
> (lra-eliminations.c:1114)
> ==8995==    by 0xA3A147: process_insn_for_elimination
> (lra-eliminations.c:1396)
> ==8995==    by 0xA3A147: lra_eliminate(bool, bool) (lra-eliminations.c:1459)
> 
> svn blame gives us
> 
> 222223   vmakarov         if (CONST_INT_P (XEXP (x, 1)) && INTVAL (XEXP (x,
> 1)) == -offset)
> 
> I suspect local variable offset isn't correct.
> 
> Configure lines are
> 
> ../trunk/configure --prefix=/home/dcb/gcc/results.255572.valgrind \
> 	--disable-bootstrap \
> 	--disable-multilib \
> 	--disable-werror \
> 	--enable-checking=valgrind \
> 	--enable-languages=c,c++,fortran
> 
> sed 's/-O2/-O3 -funroll-loops -Wtautological-compare/' < Makefile >
> Makefile.tmp
> mv Makefile.tmp Makefile
> 
> svn info tells us current revision number is 255572.

Sorry, I tried to reproduce it according to these instructions (without and
with editing the Makefile) but I've failed.

Could you confirm that it is still the problem in your environment.