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[Bug middle-end/37884] [4.4 Regression] Bootstrap failure due to miscompilation of tree-vrp.c
- From: "vmakarov at redhat dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 24 Oct 2008 22:21:52 -0000
- Subject: [Bug middle-end/37884] [4.4 Regression] Bootstrap failure due to miscompilation of tree-vrp.c
- References: <bug-37884-11173@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #2 from vmakarov at redhat dot com 2008-10-24 22:21 -------
Andreas, thanks for the useful preliminary analysis. The problem is a bit
different than 37674. Loop4 contains Loop5 and there is an exit from Loop5
right to Loop1 and store (from hard reg in L5 to memory in L1) is removed
because the corresponding pseudo-register is not changed in L5 and L4. In this
case we should propagate hard register conflicts as it is done for live ranges
in ira-build.c::copy_live_ranges_to_removed_store_destination.
I have a patch to solve the problem. Unfortunately I have not enough disk
space to make bootstrap on s390 on available to me. But at least it went to
3rd stage. After patch testing I am going to submit it.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37884