PR rtl-optimization/59278

	combine (reg_dead_at_p): Consider REG_UNUSED notes.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@218250 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index c42c2e4405555fb1e1687b79c2a1717f0aaf0716..c27b1dbc330fb4c92cf5ed1b2518bf74a1f63b6b 100644 (file)
--- 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 f471920b23eae9c44111f4a6fc7e8ae22d5570d6..63c1e4f3f6031d5fd0885d3f4274707307348649 100644 (file)
--- 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;