In the testsuite for C is the file gcc.c-torture/execute/pr38151.c
I just tried to compile this file with the GNU C compiler
version 4.4 snapshot 20090102 using valgrind.
The debug output was
==32071== Conditional jump or move depends on uninitialised value(s)
==32071== at 0x8A1544: merge_classes (i386.c:4787)
==32071== by 0x8A69D6: classify_argument (i386.c:4912)
==32071== by 0x8A727C: construct_container (i386.c:5205)
==32071== by 0x8B1283: ix86_gimplify_va_arg (i386.c:6633)
==32071== by 0x4BE4FA: gimplify_va_arg_expr (builtins.c:5025)
==32071== by 0x5FE7F5: gimplify_expr (gimplify.c:6361)
==32071== by 0x613B69: gimplify_modify_expr (gimplify.c:4230)
==32071== by 0x5FDE09: gimplify_expr (gimplify.c:6333)
I've had a quick look at the code, and I suspect that
some array index checking around line 4912 of i386.c
might help.
This bug report may be related to the original source of
this code, pr38151.
--
Summary: PR38151: valgrind finds problem
Product: gcc
Version: 4.4.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: dcb314 at hotmail dot com
GCC host triplet: x86_64-suse-linux
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38781
