2006-11-09 Serge Belyshev <belyshev@depni.sinp.msu.ru>

[pf3gnuchains/gcc-fork.git] / gcc / combine.c

diff --git a/gcc/combine.c b/gcc/combine.c
index 0f4ea02..e85e9d1 100644 (file)
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -12165,12 +12165,14 @@ distribute_notes (rtx notes, rtx from_insn, rtx i3, rtx i2, rtx elim_i2,
                      continue;
                    }
 
-                 /* If the register is being set at TEM, see if that is all
-                    TEM is doing.  If so, delete TEM.  Otherwise, make this
-                    into a REG_UNUSED note instead. Don't delete sets to
-                    global register vars.  */
-                 if ((REGNO (XEXP (note, 0)) >= FIRST_PSEUDO_REGISTER
-                      || !global_regs[REGNO (XEXP (note, 0))])
+                 /* If TEM is a (reaching) definition of the use to which the
+                    note was attached, see if that is all TEM is doing.  If so,
+                    delete TEM.  Otherwise, make this into a REG_UNUSED note
+                    instead.  Don't delete sets to global register vars.  */
+                 if ((!from_insn
+                      || INSN_CUID (tem) < INSN_CUID (from_insn))
+                     && (REGNO (XEXP (note, 0)) >= FIRST_PSEUDO_REGISTER
+                         || !global_regs[REGNO (XEXP (note, 0))])
                      && reg_set_p (XEXP (note, 0), PATTERN (tem)))
                    {
                      rtx set = single_set (tem);