Re: BUG: GCC-4.4.x changes the function frame on some functions

[Steven Rostedt]

On Thu, 2009-11-19 at 18:20 +0000, Andrew Haley wrote:

> OK, I found it.  There is a struct defined as
> 
> struct entry {
>  ...
> } __attribute__((__aligned__((1 << (4)))));
> 
> and then in timer_stats_update_stats you have a local variable of type
> struct entry:
> 
> void timer_stats_update_stats()
> {
>  spinlock_t *lock;
>  struct entry *entry, input;
> 
> So, gcc has to 16-align the stack pointer to satisfy the alignment
> for struct entry.

It has to align the entire stack? Why not just the variable within the
stack?

-- Steve


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