------- Comment #28 from kenner at vlsi1 dot ultra dot nyu dot edu 2007-03-08 16:52 ------- Subject: Re: [4.3 regression] ACATS cxh1001 fails
> I don't see what the problem is - you don't have to convert to the base > type, you can always convert to some standard type of that precision, > eg int32, before calling the builtin. Sure, but it's extra tree nodes and more to do. See below. > Sure, it's just that overloading V_C_E like this feels somehow wrong to me. Why? It's not "overloading". V_C_E of an expression E of type X to type Y means "interpret the bits of E as if it were type Y and not type X". If Y is X'Base, then interpreting E as being Y means that it can now have all the values of Y. In other words, we could only change a V_C_E to a NOP_EXPR if we can prove that the value of E is in range of *both* X and Y. Of course, we still have a bit of a mess here in that the real point is a confusion between what in Ada is called a Bounded Error and C's notion of "undefined" (Ada's "erroneous"). But I think we can do better in this area: we just haven't gotten to take a really good look at it. > However I haven't been able to put my finger on any technical obstacle to > this use of V_C_E. Nor can I ... -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26797
