On Mar 3, 2015, at 3:21 PM, Vladimir Ivanov <vladimir.x.iva...@oracle.com> wrote: > > Ah, I see now. > > You suggest to conditionally insert uncommon trap in MHI.profileBoolean when > a count == 0, right? > > Won't we end up with 2 checks if VM can't fold them (e.g. some action in > between)?
Maybe; that's the weak point of the idea. The VM *does* fold many dominating ifs, as you know. But, if the profileBoolean really traps on one branch, then it can return a *constant* value, can't it? After that, the cmps and ifs will fold up. (That's what's nice about returning the profiled value, rather than just looking at it.) — John _______________________________________________ mlvm-dev mailing list mlvm-dev@openjdk.java.net http://mail.openjdk.java.net/mailman/listinfo/mlvm-dev
