From: Matt Wette <matt.wette@gmail.com>
To: guile-devel@gnu.org
Subject: Re: flow-analysis and Offner's notes
Date: Sat, 9 Jun 2018 06:34:49 -0700 [thread overview]
Message-ID: <85a2a273-6e21-9f57-3a43-b32607a811f3@gmail.com> (raw)
In-Reply-To: <8755be82-8386-f778-1c24-5e2a1db5b717@gmail.com>
On 06/08/2018 05:17 PM, Matt Wette wrote:
> Andy Windo's blog on flow-analysis in Guile references Offner's "Notes
> on Graph
> Algorithms Used in Optimizing Compilers"? Anyone read this
> manuscript? Lemma
> 2.2 says, in a flow-graph, if x>>z and y>>z, then either x>>y or
> y>>x. The proof
> uses the argument that the path from s, the start, to z has to include
> both x and y.
> I'm not seeing that. Consider a graph s->x, s->y, x->z and y->z. What
> am I missing?
> (another example, in figure 2.1 C>>K and B>>K but C and B are not
> ordered.)
This example does not not qualify as C and B do not dominate K.
C dominates K iff every path from the start S to K goes through C.
next prev parent reply other threads:[~2018-06-09 13:34 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-09 0:17 flow-analysis and Offner's notes Matt Wette
2018-06-09 13:34 ` Matt Wette [this message]
2018-06-09 15:20 ` Matt Wette
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