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Re: -frerun-loop
- To: Toon Moene <toon at moene dot indiv dot nluug dot nl>
- Subject: Re: -frerun-loop
- From: Jeffrey A Law <law at cygnus dot com>
- Date: Fri, 24 Oct 1997 23:39:06 -0600
- cc: egcs at cygnus dot com
- Reply-To: law at cygnus dot com
It should be noted that rerunning the loop optimizer seems to
interact nicely with the simplify_giv_expr patch.
The simplify_giv_expr patch can potentially create many insns
one loop level out of a loop with complex GIVs.
Re-running loop allows many of those new insns to be hoisted
out of another loop nest.
I don't know how much gain this is in practice, but it may
be worth playing with.
jeff