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From: "tuliom at ascii dot art.br" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug gdb/30457] New: Unexpected sign extension during conversions
Date: Wed, 17 May 2023 14:49:48 +0000
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X-Bugzilla-Product: gdb
X-Bugzilla-Component: gdb
X-Bugzilla-Version: HEAD
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X-Bugzilla-Status: NEW
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D30457

            Bug ID: 30457
           Summary: Unexpected sign extension during conversions
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: tuliom at ascii dot art.br
  Target Milestone: ---

Reproducer:

$ cat test-gdb-print.c=20
#include <stdio.h>

int
main()
{
  unsigned long foo =3D 0x00007fffffffe8f8;
  unsigned long * bar =3D &foo;

  printf("*bar =3D 0x%lx\n", *bar);

  return 0;
}
$ gcc -g test-gdb-print.c
$ gdb a.out
>>> b test-gdb-print.c:9
Breakpoint 1 at 0x401144: file test-gdb-print.c, line 9.
>>> r
>>> p /x *bar
$1 =3D 0x7fffffffe8f8         <--- OK, this is what we expect.
>>> p /x bar
$2 =3D 0x7fffffffda40
>>> p /x (unsigned long) *0x7fffffffda40
$3 =3D 0xffffffffffffe8f8     <--- The value got sign extended.

--=20
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