Re^2: Oh noooooo!!

[David E. Wallace]

In article <14052 at lanl.gov>, jlg at lanl.gov (Jim Giles) writes:
> This jump is allowed by C but not by Fortran.  In fact, even the
...
> So, the optimizer for C _cannot_ be any simpler than that for
> Fortran.

Sure it can.  Just turn off flow-based optimization for any program unit that
contains a goto (or that contains a backwards goto, or that contains a goto
that is not trivially recognizeable as a loop exit, or whatever).
Since 99.999% of all C program units contain no gotos, this is a perfectly
viable option for a C compiler.  The same cannot be said of Fortran: any
Fortran optimizer that followed this strategy would find that it wasn't doing
enough optimization to be generally useful.

Dave W.