http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54154
--- Comment #2 from Paulo J. Matos <Paulo.Matos at csr dot com> 2012-08-01 14:37:53 UTC --- Created attachment 27924 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27924 Add debug info when redundant insn is going to be generated Looking at the gcc log header after running cprop_hardreg shows: rescanning insn with uid = 14. deleting insn with uid = 14. insn 14: replaced reg 0 with 1 insn 48: replaced reg 0 with 1 rescanning insn with uid = 48. deleting insn with uid = 48. rescanning insn with uid = 5. deleting insn with uid = 5. oops, substitution makes dest same as src insn 5: replaced reg 0 with 1
