[Bug middle-end/44843] New: [4.6 regression] All 32-bit fortran execution tests SEGV on SPARC: unaligned access

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

Between 20100628 and 20100705, all 32-bit Fortran execution tests started to
FAIL
on Solaris 2.  E.g. achar_1.exe:

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 1 (LWP 1)]
0xff301d98 in *_gfortrani_free_format_hash_table (u=<value optimized out>) at
/vol/gcc/src/hg/trunk/solaris/libgfortran/io/format.c:91
(gdb) where
#0  0xff301d98 in *_gfortrani_free_format_hash_table (u=<value optimized out>)
at /vol/gcc/src/hg/trunk/solaris/libgfortran/io/format.c:91
#1  0xff3132dc in close_unit_1 (u=0x21ca0, locked=1) at
/vol/gcc/src/hg/trunk/solaris/libgfortran/io/unit.c:650
#2  0xff3135bc in *_gfortrani_close_units () at
/vol/gcc/src/hg/trunk/solaris/libgfortran/io/unit.c:697
#3  0xff292084 in cleanup () at
/vol/gcc/src/hg/trunk/solaris/libgfortran/runtime/main.c:180
#4  0xff28d5d4 in __do_global_dtors_aux () from
../../../sparc-sun-solaris2.10/libgfortran/.libs/libgfortran.so.3
#5  0xff28d54c in _fini () from
../../../sparc-sun-solaris2.10/libgfortran/.libs/libgfortran.so.3
#6  0xff3c589c in call_fini () from /usr/lib/ld.so.1
#7  0xff3c5a6c in atexit_fini () from /usr/lib/ld.so.1
#8  0xff0421ac in _exithandle () from /lib/libc.so.1
#9  0xff0305d8 in exit () from /lib/libc.so.1
#10 0x000105cc in _start ()
(gdb) (gdb) display/i $pc
1: x/i $pc
=> 0xff301d98 <*_gfortrani_free_format_hash_table+32>:  clrx  [ %i0 + 0xf0 ]
(gdb) p/x $i0
$1 = 0x21cac

but %i=+0xf0 isn't 8-byte aligned.  Before, two separate clr insns were used
instead.


-- 
           Summary: [4.6 regression] All 32-bit fortran execution tests SEGV
                    on SPARC: unaligned access
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: ro at gcc dot gnu dot org
 GCC build triplet: sparc-sun-solaris2*
  GCC host triplet: sparc-sun-solaris2*
GCC target triplet: sparc-sun-solaris2*


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44843