$ gcc -S -g -dA auxv.c
$ grep -A1 regx auxv.s
data1 0x90 // DW_OP_regx
.uleb128 0xffffffff
--
data1 0x90 // DW_OP_regx
.uleb128 0xffffffff
--
data1 0x90 // DW_OP_regx
.uleb128 0xffffffff
--
Summary: [4.1 regression] invalid register in debug info
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Keywords: wrong-debug
Severity: normal
Priority: P2
Component: debug
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: schwab at suse dot de
GCC target triplet: ia64-suse-linux
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24444