*** empty log message ***

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@864 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/combine.c b/gcc/combine.c
index ade79cb..8db1fb9 100644 (file)
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -8054,14 +8054,33 @@ distribute_notes (notes, from_insn, i3, i2, elim_i2, elim_i1)
                    if (! refers_to_regno_p (i, i + 1, PATTERN (place), 0))
                      {
                        rtx piece = gen_rtx (REG, word_mode, i);
-                       rtx use_insn
-                         = emit_insn_before (gen_rtx (USE, VOIDmode, piece),
-                                             place);
+                       rtx p;
+
+                       /* See if we already placed a USE note for this
+                          register in front of PLACE.  */
+                       for (p = place;
+                            GET_CODE (PREV_INSN (p)) == INSN
+                            && GET_CODE (PATTERN (PREV_INSN (p))) == USE;
+                            p = PREV_INSN (p))
+                         if (rtx_equal_p (piece,
+                                          XEXP (PATTERN (PREV_INSN (p)), 0)))
+                           {
+                             p = 0;
+                             break;
+                           }
+
+                       if (p)
+                         {
+                           rtx use_insn
+                             = emit_insn_before (gen_rtx (USE, VOIDmode,
+                                                          piece),
+                                                 p);
+                           REG_NOTES (use_insn)
+                             = gen_rtx (EXPR_LIST, REG_DEAD, piece,
+                                        REG_NOTES (use_insn));
+                         }
 
                        all_used = 0;
-                       REG_NOTES (use_insn)
-                         = gen_rtx (EXPR_LIST, REG_DEAD, piece,
-                                    REG_NOTES (use_insn));
                      }
 
                  if (! all_used)