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From "Travis Vitek (JIRA)" <j...@apache.org>
Subject [jira] Created: (STDCXX-939) [aCC 3.63/HP-UX 11.11] SEGV when comparing pointers.
Date Fri, 16 May 2008 23:19:55 GMT
[aCC 3.63/HP-UX 11.11] SEGV when comparing pointers.
----------------------------------------------------

                 Key: STDCXX-939
                 URL: https://issues.apache.org/jira/browse/STDCXX-939
             Project: C++ Standard Library
          Issue Type: Bug
          Components: External
         Environment: HP-UX B.11.11 U
aCC: HP ANSI C++ B3910B A.03.63 
            Reporter: Travis Vitek
             Fix For: 4.2.2


{noformat}
$ cat t.cpp; aCC -g t.cpp; ./a.out
typedef void user_proc_t (int);

user_proc_t* const _sentinel_proc = (user_proc_t*)-2;

void my_user_proc (int)
{
}

int main ()
{
    return my_user_proc != _sentinel_proc;
}
Segmentation fault (core dumped)
[vitek@jenga tests]$ gdb a.out
HP gdb 5.0 for PA-RISC 1.1 or 2.0 (narrow), HP-UX 11.00
and target hppa1.1-hp-hpux11.00.
Copyright 1986 - 2001 Free Software Foundation, Inc.
Hewlett-Packard Wildebeest 5.0 (based on GDB) is covered by the
GNU General Public License. Type "show copying" to see the conditions to
change it and/or distribute copies. Type "show warranty" for warranty/support.
..
(gdb) run
Starting program: /build/vitek/4.2.2/12s/tests/a.out 

Program received signal SIGSEGV, Segmentation fault
  si_code: 0 - SEGV_UNKNOWN - Unknown Error.
0x2dac in main () at t.cpp:11
11          return my_user_proc != _sentinel_proc;
(gdb) where
#0  0x2dac in main () at t.cpp:11
(gdb) disassemble
Dump of assembler code for function main:
;;; File: t.cpp
;;;  10 {
0x2d54 <main>:  nop
0x2d58 <main+0x4>:      stw %rp,-0x14(%sp)
0x2d5c <main+0x8>:      ldo 0x40(%sp),%sp
0x2d60 <main+0xc>:      call 0x2d44 <_main>
0x2d64 <main+0x10>:     nop
;;;  11     return my_user_proc != _sentinel_proc;
0x2d68 <main+0x14>:     addil L'-0x800,%dp,%r1
0x2d6c <main+0x18>:     ldw 0x700(%r1),%r31
0x2d70 <main+0x1c>:     addil L'-0x800,%dp,%r1
0x2d74 <main+0x20>:     ldw 0x768(%r1),%r19
0x2d78 <main+0x24>:     copy %r31,%r20
0x2d7c <main+0x28>:     extrw,u %r31,31,2,%r21
0x2d80 <main+0x2c>:     cmpib,<>,n 2,%r21,0x2d94 <main+0x40>
0x2d84 <main+0x30>:     ldi 0x1000,%r22
0x2d88 <main+0x34>:     cmpb,<<,n %r31,%r22,0x2d94 <main+0x40>
0x2d8c <main+0x38>:     depw %r0,31,2,%r20
0x2d90 <main+0x3c>:     ldw 0(%r20),%r20
0x2d94 <main+0x40>:     copy %r19,%r1
0x2d98 <main+0x44>:     extrw,u %r19,31,2,%r31
0x2d9c <main+0x48>:     cmpib,<>,n 2,%r31,0x2db0 <main+0x5c>
0x2da0 <main+0x4c>:     ldi 0x1000,%r21
0x2da4 <main+0x50>:     cmpb,<<,n %r19,%r21,0x2db0 <main+0x5c>
0x2da8 <main+0x54>:     depw %r0,31,2,%r1
0x2dac <main+0x58>:     ldw 0(%r1),%r1
0x2db0 <main+0x5c>:     cmpclr,= %r20,%r1,%r22
0x2db4 <main+0x60>:     ldi 1,%r22
0x2db8 <main+0x64>:     depw,z %r22,31,1,%ret0
;;;  12 }
0x2dbc <main+0x68>:     copy %ret0,%ret0
0x2dc0 <main+0x6c>:     ldw -0x54(%sp),%rp
0x2dc4 <main+0x70>:     ret 
0x2dc8 <main+0x74>:     ldo -0x40(%sp),%sp
End of assembler dump.
(gdb) 
{noformat}

I've checked and I get the same failure with aCC 3.73 also, but not with aCC 6.16

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