Re: [PATCH] cse: Lookup for both PLUS operands in an address

[Paolo Bonzini <paolo dot bonzini at lu dot unisi dot ch>]

> Without the patch cse is only able to replace one of the PLUS operands 
> resulting in code like:
>
> r2 = u
> r3 = v
>
> r4 = r3
> r4 += 4
> r2 += &a
> r1 = [r3 + r2]
> r1 += [r4 + r2]
> r1 += [r4 + r2 + 4]
>
> And with the patch applied we get:
>
> r2 = u
> r3 = v
>
> r2 += &a
> r1 = [r3 + r2]
> r1 += [r3 + r2 + 4]
> r1 += [r3 + r2 + 8]
>  
My replacement will get this, because it looks into all the uses.  Good 
to know.

Paolo