[Bug c/66600] New: sign_mask meets valgrind

dcb314 at hotmail dot com gcc-bugzilla@gcc.gnu.org
Fri Jun 19 16:50:00 GMT 2015


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66600

            Bug ID: 66600
           Summary: sign_mask meets valgrind
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com
  Target Milestone: ---

Created attachment 35814
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35814&action=edit
gzipped C source code

I have gcc trunk, dated 20150617, compiled with --enable-checking=valgrind
and the attached code, when compiled with -O2, produces this:

==7615== Conditional jump or move depends on uninitialised value(s)
==7615==    at 0xBAB0E1: sign_mask (wide-int.h:801)
==7615==    by 0xBAB0E1: neg_p<generic_wide_int<wide_int_storage> >
(wide-int.h:
1692)
==7615==    by 0xBAB0E1: get_int_cst_ext_nunits(tree_node*,
generic_wide_int<wid
e_int_storage> const&) (tree.c:1218)
==7615==    by 0xBBC7E3: wide_int_to_tree(tree_node*,
generic_wide_int<wide_int_
ref_storage<false> > const&) (tree.c:1399)



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