* Small cleanup in RTL expansion
@ 2019-07-02 9:45 Eric Botcazou
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From: Eric Botcazou @ 2019-07-02 9:45 UTC (permalink / raw)
To: gcc-patches
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pass_expand::execute does the same job as commit_edge_insertions but manually,
except for a special case if the entry block has a single successor. But we
can extract the special case and just call commit_edge_insertions afterwards.
Tested on x86_64-suse-linux, applied on the mainline.
2019-07-02 Eric Botcazou <ebotcazou@adacore.com>
* cfgexpand.c (pass_expand::execute): Deal specially with instructions
to be inserted on single successor edge of the entry block. Then call
commit_edge_insertions instead of inserting the instructions manually.
* cfgrtl.c (commit_edge_insertions): Do not verify flow info during
RTL expansion.
--
Eric Botcazou
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Index: cfgexpand.c
===================================================================
--- cfgexpand.c (revision 272891)
+++ cfgexpand.c (working copy)
@@ -6576,37 +6576,27 @@ pass_expand::execute (function *fun)
split edges which edge insertions might do. */
rebuild_jump_labels (get_insns ());
- FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR_FOR_FN (fun),
- EXIT_BLOCK_PTR_FOR_FN (fun), next_bb)
+ /* If we have a single successor to the entry block, put the pending insns
+ after parm birth, but before NOTE_INSNS_FUNCTION_BEG. */
+ if (single_succ_p (ENTRY_BLOCK_PTR_FOR_FN (fun)))
{
- edge e;
- edge_iterator ei;
- for (ei = ei_start (bb->succs); (e = ei_safe_edge (ei)); )
+ edge e = single_succ_edge (ENTRY_BLOCK_PTR_FOR_FN (fun));
+ if (e->insns.r)
{
- if (e->insns.r)
- {
- rebuild_jump_labels_chain (e->insns.r);
- /* Put insns after parm birth, but before
- NOTE_INSNS_FUNCTION_BEG. */
- if (e->src == ENTRY_BLOCK_PTR_FOR_FN (fun)
- && single_succ_p (ENTRY_BLOCK_PTR_FOR_FN (fun)))
- {
- rtx_insn *insns = e->insns.r;
- e->insns.r = NULL;
- if (NOTE_P (parm_birth_insn)
- && NOTE_KIND (parm_birth_insn) == NOTE_INSN_FUNCTION_BEG)
- emit_insn_before_noloc (insns, parm_birth_insn, e->dest);
- else
- emit_insn_after_noloc (insns, parm_birth_insn, e->dest);
- }
- else
- commit_one_edge_insertion (e);
- }
+ rtx_insn *insns = e->insns.r;
+ e->insns.r = NULL;
+ rebuild_jump_labels_chain (insns);
+ if (NOTE_P (parm_birth_insn)
+ && NOTE_KIND (parm_birth_insn) == NOTE_INSN_FUNCTION_BEG)
+ emit_insn_before_noloc (insns, parm_birth_insn, e->dest);
else
- ei_next (&ei);
+ emit_insn_after_noloc (insns, parm_birth_insn, e->dest);
}
}
+ /* Otherwise, as well as for other edges, take the usual way. */
+ commit_edge_insertions ();
+
/* We're done expanding trees to RTL. */
currently_expanding_to_rtl = 0;
Index: cfgrtl.c
===================================================================
--- cfgrtl.c (revision 272891)
+++ cfgrtl.c (working copy)
@@ -2105,7 +2105,8 @@ commit_edge_insertions (void)
which will be done by fixup_partitions. */
fixup_partitions ();
- checking_verify_flow_info ();
+ if (!currently_expanding_to_rtl)
+ checking_verify_flow_info ();
FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR_FOR_FN (cfun),
EXIT_BLOCK_PTR_FOR_FN (cfun), next_bb)
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