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[Bug target/28764] [4.2 Regression] libjava build failure on sh4
- From: "amylaar at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 25 Aug 2006 17:01:20 -0000
- Subject: [Bug target/28764] [4.2 Regression] libjava build failure on sh4
- References: <bug-28764-5208@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #15 from amylaar at gcc dot gnu dot org 2006-08-25 17:01 -------
(In reply to comment #13)
> For any transparent sub-graph, considering the expression anticipatable
> in this graph is beneficial if the sum of the frequencies of outgoing edges
> on which the expression is anticipatable is larger than the sum of the
> frequencies of incoming edges on which the expression is not available.
Actually, for SH variants with the FPCHG instruction, we could do a lower
cost mode switch if the previous mode is known. Hence we can also add
some benefit for the other mode being anticipatable, and the cost of
the considered mode not being available is reduced when the other mode
is available.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28764