a question about memory access on IA64

[liuduo <liuduo@sinosoft.com.cn>]

Dear Sir:
nice to see you !
here is a problem about accessing memory on IA64 as follows,
 we define a structrue is :
typedef struct b{
unsigned short  b1;
unsigned short  b2;
unsigned char   b3;
unsigned char  b4;
unsigned char  b5;
unsigned char  b6;
}B;

typedef struct  a{
struct b bb[512];
int c;}A;

when we use  the struct A on IA64, the segmentation fault occurs ,
and then we modify the struct A as follows :
typedef struct  a{
int c;
struct b bb[512];
}A;
we can use it normally .
can you  explain why ?
thanks a lot , and expect your reply urgently

yours : calis






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