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[Bug tree-optimization/15524] [4.0 Regression] jump threading on trees is slow with switch statements with large # of cases
- From: "s dot bosscher at student dot tudelft dot nl" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 3 Nov 2004 16:52:33 -0000
- Subject: [Bug tree-optimization/15524] [4.0 Regression] jump threading on trees is slow with switch statements with large # of cases
- References: <20040518194300.15524.pinskia@gcc.gnu.org>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From s dot bosscher at student dot tudelft dot nl 2004-11-03 16:52 -------
Subject: RE: [4.0 Regression] jump threading
on trees is slow with switch statements with large # of cases
> No you don't know it's size or density in advance. We're not looking
> at case values, but at the label where each case statement will jump to.
You could move the expand code for SWITCH_EXPRs out of
expand_expr, and call it from cfgexpand.c, passing the
number of outgoing edges.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15524