combine.c (try_combine): Only pass SET or CLOBBER to SET_DEST

        * combine.c (try_combine): Only pass SET or CLOBBER to SET_DEST
        * rs6000.md: Only access a CONST_INT with INTVAL

From-SVN: r30729

gcc/ChangeLog

+Tue Nov 30 15:18:35 1999  Franz Sirl  <Franz.Sirl-kernel@lauterbach.com>
+
+	* combine.c (try_combine): Only pass SET or CLOBBER to SET_DEST
+	* rs6000.md: Only access a CONST_INT with INTVAL
+
 Tue Nov 30 14:21:00 1999  Richard Henderson  <rth@cygnus.com>
 
 	* lcm.c (compute_laterin): Cast bb->aux to size_t not int.

gcc/combine.c

@@ -1547,7 +1547,9 @@ try_combine (i3, i2, i1)
 
       if (i == XVECLEN (p2, 0))
 	for (i = 0; i < XVECLEN (p2, 0); i++)
-	  if (SET_DEST (XVECEXP (p2, 0, i)) == SET_SRC (PATTERN (i3)))
+	  if ((GET_CODE (XVECEXP (p2, 0, i)) == SET
+	       || GET_CODE (XVECEXP (p2, 0, i)) == CLOBBER)
+	      && SET_DEST (XVECEXP (p2, 0, i)) == SET_SRC (PATTERN (i3)))
 	    {
 	      combine_merges++;
 

gcc/config/rs6000/rs6000.md

@@ -1717,11 +1717,16 @@
   ""
   "
 {
-  int i = exact_log2 (INTVAL (operands[2]));
+  int i;
   rtx temp1;
   rtx temp2;
 
-  if (GET_CODE (operands[2]) != CONST_INT || i < 0)
+  if (GET_CODE (operands[2]) != CONST_INT)
+    FAIL;
+
+  i = exact_log2 (INTVAL (operands[2]));
+
+  if (i < 0)
     FAIL;
 
   temp1 = gen_reg_rtx (SImode);