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[Bug rtl-optimization/42889] [4.5 Regression] "-fcompare-debug failure (length)" with "-O1 -fgcse"
- From: "steven at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 28 Jan 2010 18:05:19 -0000
- Subject: [Bug rtl-optimization/42889] [4.5 Regression] "-fcompare-debug failure (length)" with "-O1 -fgcse"
- References: <bug-42889-14164@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #17 from steven at gcc dot gnu dot org 2010-01-28 18:05 -------
How does this address the 30ish calls to df_set_bb_dirty from the rest of the
compiler? See cfgcleanup, cfgrtl, emit-rtl, ifcvt, and modulo-sched. Each of
them could result in a DCE run if someone adds DF_LR_RUN_DCE. At least in ifcvt
we already have this problem even now (i.e. directly from ifcvt.c). The others
could trigger a DCE run via one of the CFG manipulation functions in cfg* and
emit-rtl.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42889