[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

[vries at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50764

--- Comment #3 from vries at gcc dot gnu.org 2011-10-27 14:32:45 UTC ---
Created attachment 25633
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=25633
sdiff between 209r.split4 (before sched2) -fno-tree-tail-merge and
-ftree-tail-merge

differences between the 2:
- the position of a dead code_label (code_label 33 vs. code_label 23)
- the presence of DImode on label_refs (insn 19 vs insn 19,  insn 26 vs insn
31)