Re: Gotos

bright@dataio.Data-IO.COM (Walter Bright)
17 Nov 89 21:51:25 GMT

          From comp.compilers
Related articles
Gotos jhallen@wpi.wpi.edu (1989-11-12)
Re: Gotos preston@rice.edu (Preston Briggs) (1989-11-13)
Re: Gotos bright@dataio.Data-IO.COM (1989-11-17)
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Newsgroups: comp.compilers
Date: 17 Nov 89 21:51:25 GMT
References: <1989Nov13.203034.1778@esegue.segue.boston.ma.us>
From: bright@dataio.Data-IO.COM (Walter Bright)
Organization: Data I/O Corporation; Redmond, WA

In article <1989Nov13.203034.1778@esegue.segue.boston.ma.us> Preston Briggs <preston@rice.edu> writes:
>In article <1989Nov12.222530.14148@esegue.segue.boston.ma.us> you write:
>>In particular, do C optimizing compilers take a simple minded
>>view towards gotos or does data flow analysis actually follow goto paths?


Zortech C's optimizer (which I wrote) converts *everything* into goto's, and
then analyzes the flow graph to discover loops and such.


>Do any of the IBM PC-class C compilers do global optimizations?
Zortech does.


>Global constant propagation?
Zortech does.


>Graph coloring register allocation?
Zortech does.


ZTC also does loop induction variables, copy propagation, common
subexpressions, very busy expressions, dead variables, dead code,
loop invariants, etc.
[From bright@dataio.Data-IO.COM (Walter Bright)]




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