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We're updating REG_DEAD notes in regrename.c, but it seems this is for historical reasons only. As far as I can tell, every pass that needs such notes recomputes them with df_note_add_problem/df_analyze, and the following patch bootstrapped and tested successfully on i686-linux (some random libmudflap failures mentioned previously), with the following change to ensure it's tested: +++ gcc/config/i386/i386.c (working copy) @@ -5099,6 +5099,9 @@ static const struct default_options ix86 #ifdef INSN_SCHEDULING { OPT_LEVELS_ALL, OPT_fschedule_insns, NULL, 0 }, #endif +#ifdef INSN_SCHEDULING + { OPT_LEVELS_2_PLUS, OPT_frename_registers, NULL, 1 }, +#endif Ok? Bernd
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