[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)
[EMAIL PROTECTED] 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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