https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65997
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2015-05-04
Summary|-mregparm=3 causes bad |Bad DWARF debug info
|DWARF debug info |
Ever confirmed|0 |1
--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
Also happen on x86-64:
[hjl@gnu-6 gcc]$ cat /tmp/x.c
void
foo (void *b , unsigned int length)
{
char *ptr = (char *)b;
while (length--)
*ptr++ = 0;
}
[hjl@gnu-6 gcc]$ /usr/gcc-5.1.1/bin/gcc -O2 -g /tmp/x.c -c
[hjl@gnu-6 gcc]$ readelf --debug-dump=loc x.o
Contents of the .zdebug_loc section:
Offset Begin End Expression
00000000 0000000000000000 000000000000000c (DW_OP_reg5 (rdi))
00000013 000000000000000c 000000000000001f (DW_OP_GNU_entry_value:
(DW_OP_reg5 (rdi)); DW_OP_stack_value)
00000029 <End of list>
00000039 <End of list>
readelf: Warning: There are 40 unused bytes at the end of section .zdebug_loc
[hjl@gnu-6 gcc]$
