[tuples] gimple_assign_subcode for GIMPLE_SINGLE_RHS

[Zdenek Dvorak]

Hi,

> On 03/10/08 08:24, Richard Guenther wrote:
> 
> >You could either do
> >
> >GIMPLE_ASSIGN <COND_EXPR, cond, x, y>
> 
> But 'cond' would be an unflattened tree expression.  I'm trying to avoid 
> that.
> 
> >or invent COND_GT_EXPR, COND_GE_EXPR, etc. (at least in GIMPLE
> >we always have a comparison in COND_EXPR_COND, never a plain
> >boolean variable).
> 
> Yeah, that would mean adding 5 more tree codes, though.  Unless we gave 
> up and invented a new set of subcodes exclusively for gimple.  That 
> seems like a waste, since tree.def neatly defines all the subcodes we 
> want already.

another possibility would be to represent a = b < c ? d : e as

GIMPLE_ASSIGN (LT_EXPR, a, b, c, d, e)

and a = (b < c) as

GIMPLE_ASSIGN (LT_EXPR, a, b, c, true, false)

Zdenek