[Bug c/55882] unaligned load/store : incorrect struct offset

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55882



--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> 2013-01-08 
15:25:46 UTC ---

GCC clealy thinks that



(insn 21 20 0 2 (set (mem/j:SI (plus:SI (reg/f:SI 195)

                (const_int 10 [0xa])) [0+-2 S4 A32])

        (reg:SI 201)) t.i:85 -1



is 4-byte aligned (but it _does_ have this strange MEM_OFFSET setting ...

which should be useless without a MEM_EXPR).



Does



unsigned short

testfunction(void)

{

    mystruct dmfe[8];

    unsigned i = 0;

    dmfe[0].use_alt_rd_dqs = 1;

    dmfe[i].use_alt_rd_dqs = 0;

    return dmfe[0].use_alt_rd_dqs;

}



extern void abort (void);

int main () { if (testfunction() != 0) abort (); }



abort for you?