Unaligned floating point access generation for powerpc

[Mike Stump]

On Wednesday, October 22, 2003, at 08:09  AM, David Edelsohn wrote:
> 	The programmer is overriding the ABI definitions for alignment.
> The compiler assumes the programmer knows what s/he is doing.  
> Violating
> the ABI may produce inefficient code.  Why do you expect the compiler 
> to
> do anything else?

?

The compiler is allowed to produce inefficient code, the compiler isn't 
allowed to produce code that doesn't work.  To do so, would be a bug.  
Now, the bug may me that gcc always assumes the existence of a trap 
handler to do the move and hasn't been ported to a ppc without such a 
handler, or the bug may be that the backend can't assume that and must 
generate a move by pieces style code.

I'd call it a compiler bug in any event.  Worst case, the target 
platform doesn't allow for trap handlers and gcc just has to be smart 
enough to generate code that will never fault.