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Date: Tue, 18 May 2004 16:17:00 -0000
From: "ken dot tsukahara at tmt-d dot co dot jp" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Message-ID: <20040518014945.15506.ken.tsukahara@tmt-d.co.jp>
Reply-To: gcc-bugzilla@gcc.gnu.org
Subject: [Bug c/15506] New: wrong cast from long to long long
X-Bugzilla-Reason: CC
X-SW-Source: 2004-05/txt/msg01942.txt.bz2
List-Id: <gcc-bugs.sourceware.org>

on x86 family(32bit) Linux
RedHat9 : GCC 3.2.2, 3.2.3
SUSE9 : GCC 3.3.1, 3.4.1

A long long value which is casted from a long value (< 0) seems to be wrong.

$ cat longlong.c

#include <stdio.h>
int main(int argc, char **argv)
{
    long long     ll = 0xc0000000;
    unsigned long ul = 0xc0000000;
    long          sl = 0xc0000000;

    printf("long long : 0x%llx\n", ll);
    printf("u_long    : 0x%lx\n",  ul);
    printf("long      : 0x%lx\n",  sl);
    printf("u_long -> long long : 0x%llx\n", (long long)ul);
    printf("long   -> long long : 0x%llx\n", (long long)sl);

    return 0;
}

$ cc -o longlong longlong.c
$ ./longlong
long long : 0xc0000000
u_long    : 0xc0000000
long      : 0xc0000000
u_long -> long long : 0xc0000000
long   -> long long : 0xffffffffc0000000

-- 
           Summary: wrong cast from long to long long
           Product: gcc
           Version: 3.4.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P1
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: ken dot tsukahara at tmt-d dot co dot jp
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15506