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[Bug tree-optimization/50764] [4.7 Regression] ICE: in maybe_record_trace_start, at dwarf2cfi.c:2243 with -O2 -fsched2-use-superblocks -ftree-tail-merge
- From: "vries at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 17 Oct 2011 21:55:12 +0000
- Subject: [Bug tree-optimization/50764] [4.7 Regression] ICE: in maybe_record_trace_start, at dwarf2cfi.c:2243 with -O2 -fsched2-use-superblocks -ftree-tail-merge
- Auto-submitted: auto-generated
- References: <bug-50764-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50764
--- Comment #1 from vries at gcc dot gnu.org 2011-10-17 21:55:12 UTC ---
Created attachment 25535
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=25535
sdiff between 091t.crited and 092t.pre
I don't seen anything obviously wrong with the transformation by
-ftree-tail-merge.
Block 6 and block 7 have the same successor (block 4) and are both empty, so
equal.
Block 7 is removed, the incoming edge of block 7 is redirected to block 6, and
a virtual phi is inserted at the start of block 6.