diff options
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index e226c7dd..c108f65 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -983,14 +983,17 @@ combine_validate_cost (rtx_insn *i0, rtx_insn *i1, rtx_insn *i2, rtx_insn *i3, } -/* Delete any insns that copy a register to itself. */ +/* Delete any insns that copy a register to itself. + Return true if the CFG was changed. */ -static void +static bool delete_noop_moves (void) { rtx_insn *insn, *next; basic_block bb; + bool edges_deleted = false; + FOR_EACH_BB_FN (bb, cfun) { for (insn = BB_HEAD (bb); insn != NEXT_INSN (BB_END (bb)); insn = next) @@ -1001,10 +1004,12 @@ delete_noop_moves (void) if (dump_file) fprintf (dump_file, "deleting noop move %d\n", INSN_UID (insn)); - delete_insn_and_edges (insn); + edges_deleted |= delete_insn_and_edges (insn); } } } + + return edges_deleted; } @@ -1143,8 +1148,8 @@ insn_a_feeds_b (rtx_insn *a, rtx_insn *b) /* Main entry point for combiner. F is the first insn of the function. NREGS is the first unused pseudo-reg number. - Return nonzero if the combiner has turned an indirect jump - instruction into a direct jump. */ + Return nonzero if the CFG was changed (e.g. if the combiner has + turned an indirect jump instruction into a direct jump). */ static int combine_instructions (rtx_insn *f, unsigned int nregs) { @@ -1529,7 +1534,7 @@ retry: default_rtl_profile (); clear_bb_flags (); new_direct_jump_p |= purge_all_dead_edges (); - delete_noop_moves (); + new_direct_jump_p |= delete_noop_moves (); /* Clean up. */ obstack_free (&insn_link_obstack, NULL); |