(distribute_notes): When output an insn to hold a REG_DEAD note,

update basic_block_head if necessary.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@8658 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/combine.c b/gcc/combine.c
index f7415ae..fb82ea8 100644 (file)
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -10576,9 +10576,16 @@ distribute_notes (notes, from_insn, i3, i2, elim_i2, elim_i1)
                 put the death node there.  This prevents problems with
                 call-state tracking in caller-save.c.  */
              if (REG_NOTE_KIND (note) == REG_DEAD && place == 0 && tem != 0)
-               place
-                 = emit_insn_after (gen_rtx (USE, VOIDmode, XEXP (note, 0)),
-                                    tem);
+               {
+                 place
+                   = emit_insn_after (gen_rtx (USE, VOIDmode, XEXP (note, 0)),
+                                      tem);
+
+                 /* If this insn was emitted between blocks, then update
+                    basic_block_head of the current block to include it.  */
+                 if (basic_block_end[this_basic_block - 1] == tem)
+                   basic_block_head[this_basic_block] = place;
+               }
            }
 
          /* If the register is set or already dead at PLACE, we needn't do