* rtlanal.c (single_set): Reject if the parallel has anything

        except SET or USE or CLOBBER.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@32614 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 23 insertions, 9 deletions

diff --git a/gcc/rtlanal.c b/gcc/rtlanal.c
index 5c7e527c80f..b10a3bf3438 100644
--- a/gcc/rtlanal.c
+++ b/gcc/rtlanal.c
@@ -703,16 +703,30 @@ single_set (insn)
   else if (GET_CODE (PATTERN (insn)) == PARALLEL)
     {
       for (i = 0, set = 0; i < XVECLEN (PATTERN (insn), 0); i++)
-	if (GET_CODE (XVECEXP (PATTERN (insn), 0, i)) == SET
-	    && (! find_reg_note (insn, REG_UNUSED,
-				 SET_DEST (XVECEXP (PATTERN (insn), 0, i)))
-		|| side_effects_p (XVECEXP (PATTERN (insn), 0, i))))
-	  {
-	    if (set)
+	{
+	  rtx sub = XVECEXP (PATTERN (insn), 0, i);
+
+	  switch (GET_CODE (sub))
+	    {
+	    case USE:
+	    case CLOBBER:
+	      break;
+
+	    case SET:
+	      if (! find_reg_note (insn, REG_UNUSED, SET_DEST (sub))
+		  || side_effects_p (sub))
+		{
+		  if (set)
+		    return 0;
+		  else
+		    set = sub;
+		}
+	      break;
+
+	    default:
 	      return 0;
-	    else
-	      set = XVECEXP (PATTERN (insn), 0, i);
-	  }
+	    }
+	}
       return set;
     }