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[Bug rtl-optimization/39762] [4.4/4.5 Regression] IRA ICE with -msoft-float
- From: "vmakarov at redhat dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 15 Apr 2009 21:49:33 -0000
- Subject: [Bug rtl-optimization/39762] [4.4/4.5 Regression] IRA ICE with -msoft-float
- References: <bug-39762-87@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #1 from vmakarov at redhat dot com 2009-04-15 21:49 -------
The compiler is broken in IRA on this test because ira_register_move_cost is
not initialized for DFmode, AREG, GENERAL_REGS.
It is supposed that all necessary elements of this array are initialized in
ira-costs.c by ira_init_register_move_cost but it was not done for this mode
and reg classes for some reasons. I think that the elements should be checked
for initialization every time when we need their values. It would be a tiny
performance penalty but it will guarantee that such situation will be not
occurred anymore.
I'll send a patch soon.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39762