On 10/18/13 15:15, Marc Glisse wrote:
On Fri, 18 Oct 2013, Jeff Law wrote:
On 10/18/13 14:31, Marc Glisse wrote:
But once you have that pointer defined by a PHI containing a zero, you
look at all its uses, trying to find one that proves the pointer is
non-zero
What are you going to do with that information?
Uh? I must have been very unclear in my post, this sentence was supposed
to describe what *your* patch is doing...
Ah, no worries. Sometimes email is a lousy medium for communication.
Yes, precisely. All I was talking about was separating the predicate:
"this statement results in UB if that SSA_NAME pointer is NULL" into its
own function, and we happen to already have a function in VRP which does
that.
Yes, good point. Sharing that routine would be advisable for various
reasons. I don't offhand see anything VRP specific in there, so it
ought to be relatively easy.
Jeff
