[Bug target/36043] gcc reads 8 bytes for a struct of size 6 which leads to sigsegv

["rguenth at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #6 from rguenth at gcc dot gnu dot org  2008-04-25 15:29 -------
Errm.  change_address_1 simply builds a DImode mem (with alignment
info properly retained)

#0  0x00000000005e80c2 in adjust_address_1 (memref=0x2b0751d81520, 
    mode=DImode, offset=0, validate=0, adjust=1)
    at /space/rguenther/src/svn/gcc-4_3-branch/gcc/emit-rtl.c:1910
#1  0x00000000005e396c in operand_subword (op=0x2b0751d81520, offset=0, 
    validate_address=1, mode=BLKmode)
    at /space/rguenther/src/svn/gcc-4_3-branch/gcc/emit-rtl.c:1346
#2  0x00000000005e3a28 in operand_subword_force (op=0x2b0751d81520, offset=0, 
    mode=BLKmode)
    at /space/rguenther/src/svn/gcc-4_3-branch/gcc/emit-rtl.c:1374
#3  0x000000000060fd27 in move_block_to_reg (regno=5, x=0x2b0751d81520, 
    nregs=1, mode=BLKmode)
    at /space/rguenther/src/svn/gcc-4_3-branch/gcc/expr.c:1560
#4  0x000000000054f7b9 in load_register_parameters (args=0x7fff59711810, 
    num_actuals=1, call_fusage=0x7fff597119d0, flags=0, is_sibcall=0, 
    sibcall_failure=0x7fff597119ac)
    at /space/rguenther/src/svn/gcc-4_3-branch/gcc/calls.c:1681
#5  0x00000000005526b4 in expand_call (exp=0x2b075142d460, target=0x0, 
    ignore=1) at /space/rguenther/src/svn/gcc-4_3-branch/gcc/calls.c:2763

no idea if that is supposed to work (and thus *movdi_1_rex64 shouldn't match)
or if not ...


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36043