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Fix bug with simple returns on cc0 targets
- From: Eric Botcazou <ebotcazou at adacore dot com>
- To: gcc-patches at gcc dot gnu dot org
- Date: Mon, 25 Mar 2013 12:24:15 +0100
- Subject: Fix bug with simple returns on cc0 targets
Hi,
for a private port which both is a cc0 target and has conditional returns,
emit_use_return_register_into_block will try to emit the use return register
sequence between a cc0 setter and a cc0 user.
Fixed thusly, tested on x86_64-suse-linux, applied on the mainline.
2013-03-25 Eric Botcazou <ebotcazou@adacore.com>
* function.c (emit_use_return_register_into_block): On cc0 targets,
do not emit the sequence between cc0 setter and user.
--
Eric Botcazou
Index: function.c
===================================================================
--- function.c (revision 197003)
+++ function.c (working copy)
@@ -5598,12 +5598,17 @@ prepare_shrink_wrap (basic_block entry_b
static void
emit_use_return_register_into_block (basic_block bb)
{
- rtx seq;
+ rtx seq, insn;
start_sequence ();
use_return_register ();
seq = get_insns ();
end_sequence ();
- emit_insn_before (seq, BB_END (bb));
+ insn = BB_END (bb);
+#ifdef HAVE_cc0
+ if (reg_mentioned_p (cc0_rtx, PATTERN (insn)))
+ insn = prev_cc0_setter (insn);
+#endif
+ emit_insn_before (seq, insn);
}