On Fri, Jun 6, 2014 at 9:47 AM, Uros Bizjak <ubiz...@gmail.com> wrote:
>> 2014-05-28 Richard Biener <rguent...@suse.de>
>>
>> PR tree-optimization/61335
>> * tree-vrp.c (vrp_visit_phi_node): If the compare of old and
>> new range fails, drop to varying.
>>
>> * gfortran.dg/pr61335.f90: New testcase.
>
> This testcase triggers SIGFPE on alpha due to the use of denormal
> operand. Maybe uninitialized value is used in line 48?
SIGFPE also triggers at the same place on x86_64 with unmasked FPE
exceptions (compile with -O0).
(gdb) b main
Breakpoint 1 at 0x401602: file
/home/uros/gcc-svn/trunk/gcc/testsuite/gfortran.dg/pr61335.f90, line
115.
(gdb) r
Starting program: /home/uros/test/pr61335.exe
warning: no loadable sections found in added symbol-file
system-supplied DSO at 0x2aaaaaaab000
Breakpoint 1, main (argc=1, argv=0x7fffffffd88e) at
/home/uros/gcc-svn/trunk/gcc/testsuite/gfortran.dg/pr61335.f90:115
115 USE cp_units
(gdb) i r mxcsr
mxcsr 0x1f80 [ IM DM ZM OM UM PM ]
(gdb) set $mxcsr=0x1000
(gdb) i r mxcsr
mxcsr 0x1000 [ PM ]
(gdb) c
Continuing.
Program received signal SIGFPE, Arithmetic exception.
0x0000000000400b60 in cp_units::cp_unit_create (string=<error reading
variable: Cannot access memory at address 0x401c47>, _string=5)
at /home/uros/gcc-svn/trunk/gcc/testsuite/gfortran.dg/pr61335.f90:49
49 kind_id=cp_ukind_none
0x0000000000400b57 <+95>: mov -0x28(%rbp),%eax
0x0000000000400b5a <+98>: mov %eax,-0x280(%rbp)
=> 0x0000000000400b60 <+104>: cvttss2si -0x280(%rbp),%ecx
(gdb) i r mxcsr
mxcsr 0x1021 [ IE PE PM ]
Uros.
