From: Segher Boessenkool <segher@kernel.crashing.org>
Date: Mon, 1 Dec 2014 23:48:26 +0000 (+0100)
Subject: re PR rtl-optimization/59278 (combine does not replace matched insn)
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=14f2df344a8b68da0bd31e6a8201ae293b55d499;p=gcc.git

re PR rtl-optimization/59278 (combine does not replace matched insn)

	PR rtl-optimization/59278
	combine (reg_dead_at_p): Consider REG_UNUSED notes.

From-SVN: r218250
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index c42c2e44055..c27b1dbc330 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2014-12-01  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	PR rtl-optimization/59278
+	combine (reg_dead_at_p): Consider REG_UNUSED notes.
+
 2014-12-01  Segher Boessenkool  <segher@kernel.crashing.org>
 
 	* combine.c (try_combine): Use is_parallel_of_n_reg_sets some more.
diff --git a/gcc/combine.c b/gcc/combine.c
index f471920b23e..63c1e4f3f60 100644
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -12990,6 +12990,9 @@ reg_dead_at_p (rtx reg, rtx_insn *insn)
     {
       if (INSN_P (insn))
         {
+	  if (find_regno_note (insn, REG_UNUSED, reg_dead_regno))
+	    return 1;
+
 	  note_stores (PATTERN (insn), reg_dead_at_p_1, NULL);
 	  if (reg_dead_flag)
 	    return reg_dead_flag == 1 ? 1 : 0;