Different multiply operator for pointers and integers

[Dave Korn]

> -----Original Message-----
> From: gcc-owner On Behalf Of Richard Earnshaw
> Sent: 16 December 2004 16:40

> On Thu, 2004-12-16 at 16:32, Laura Tosoratto wrote:

> > In the same time, it needs all addresses to be hold in a 
> specific part 
> > of register file (we defined a reg_class to represent this 
> set of regs) .


> You just need to provide multiple alternatives to the 
> standard multiply operator.
> 
> If your two register classes are matched by the constraint letters 'x'
> and 'y' respectively, then you just need a pattern something like
> 
> (define_insn "muldi"
>    [(set (match_operand:DI 0 "register_operand" "=x,y")
>          (mult:DI (match_operand:DI 1 "register_operand" "%x,y")
> 		 (match_operand:DI 2 "register_operand" "x,y")))]
>   ""
>   "@
>   mult_fmt1 %0, %1, %2
>   mult_fmt2 %0, %1, %2")
> 

  Doesn't that assume that the registers that hold pointers can _only_ be used
for pointers and not for integers?  It doesn't necessarily follow from Laura's
original description that those registers _can't_ hold integers, only that
pointers _must_ be in one of them.

    cheers, 
      DaveK
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