[Bug target/18251] unable to find a register to spill in class `POINTER_REGS'

[andrewhutchinson at cox dot net]

------- Additional Comments From andrewhutchinson at cox dot net  2005-03-12 21:20 -------
(In reply to comment #18)
> (In reply to comment #17) 

I think it is always true but the original used the same predicate and test (so
I played safe).

The pattern only helps if it is a constant.  I also thought it should handle
variable block size. However,  I found gcc already produces optimal code for
that case without any help.



> > Marek, can you review this bug, the attached patches, and possibly approve 
> > committing the fix? 
>  
> I'm looking into it right now.  I'm not sure about one thing: should "movmemhi" 
> handle only constant block sizes, or variable block sizes too?  If variable - 
> is it safe to assume nonzero?  (now 0 means 65536) 
>  
> Operand 2 (block size) has the "const_int_operand" predicate - doesn't this 
> mean that (GET_CODE(operands[2]) == CONST_INT) is always true? 
>  
> Thanks, 
> Marek 
>  



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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18251