re PR middle-end/48908 (build fails on cris-elf in libiberty:md5.c, shift-related)

2011-05-08  Richard Guenther  <rguenther@suse.de>

	PR middle-end/48908
	PR middle-end/48905
	* expmed.c (expand_shift_1): Compute adjusted constant shift
	amount manually.

From-SVN: r173550

gcc/ChangeLog

+2011-05-08  Richard Guenther  <rguenther@suse.de>
+
+	PR middle-end/48908
+	PR middle-end/48905
+	* expmed.c (expand_shift_1): Compute adjusted constant shift
+	amount manually.
+
 2011-05-08  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* config/avr/avr.c (print_operand_address): Fix invalid RTL access.

gcc/expmed.c

@@ -2142,10 +2142,14 @@ expand_shift_1 (enum tree_code code, enum machine_mode mode, rtx shifted,
 	      rtx temp1;
 
 	      new_amount = op1;
-	      other_amount
-		= simplify_gen_binary (MINUS, GET_MODE (op1),
-				       GEN_INT (GET_MODE_BITSIZE (mode)),
-				       op1);
+	      if (CONST_INT_P (op1))
+		other_amount = GEN_INT (GET_MODE_BITSIZE (mode)
+					- INTVAL (op1));
+	      else
+		other_amount
+		  = simplify_gen_binary (MINUS, GET_MODE (op1),
+					 GEN_INT (GET_MODE_BITSIZE (mode)),
+					 op1);
 
 	      shifted = force_reg (mode, shifted);