[Bug c/18671] New: Structure with bit-field offset is wrong.

[Bug c/18671] New: Structure with bit-field offset is wrong.

[nitins2 at kpitcummins dot com]

Hi,
I am using tool chain built with gcc-3.4-20040813 snapshot.
The structure offset byte is wrong for the following C-source code with "-
mrenesas" option.
Without "-mrenesas" option it gives correct offset that is 4.

The data "b2" of structure "bbb" offset is comming 8 which is wrong, it should 
be 4.

******************************test.c***************************
struct aaa{
    int a1;
}*zzz;

struct bbb {
     int b1:1;
     int b2;
};

test(){
    ((struct bbb*)zzz)->b2 = 0x12345678;
}

************************Command line **************************
sh-elf-gcc -mrenesas  -S test.c

***********************test.s**********************************
_test:
        mov.l   r14,@-r15
        mov     r15,r14
        mov.l   .L2,r1
        mov.l   @r1,r2
        mov.l   .L3,r1
        mov.l   r1,@(8,r2)  <-WRONG OFFSET 
        mov     r14,r15
        mov.l   @r15+,r14
        rts
        nop
***************************************************************

Kindly suggest how to solve this bug.

Thanks in advance.

Nitin Shah,
KPIT Cummins InfoSystems Ltd.
Pune, India

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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

-- 
           Summary: Structure with bit-field offset is wrong.
           Product: gcc
           Version: 3.4.2
            Status: UNCONFIRMED
          Severity: critical
          Priority: P1
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: nitins2 at kpitcummins dot com
                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: sh-unknown-elf/sh-unknown-coff


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18671

[Bug target/18671] Structure with bit-field offset is wrong.

[pinskia at gcc dot gnu dot org]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|critical                    |normal
          Component|c                           |target


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18671

[Bug target/18671] Structure with bit-field offset is wrong.

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-11-29 14:29 -------
This seems like an alignment issue.

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18671

[Bug target/18671] Structure with bit-field offset is wrong.

[pinskia at gcc dot gnu dot org]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
  GCC build triplet|i686-pc-linux-gnu           |
   GCC host triplet|i686-pc-linux-gnu           |
 GCC target triplet|sh-unknown-elf/sh-unknown-  |sh-elf/sh-coff
                   |coff                        |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18671