re PR middle-end/36701 (unaligned access in gcc.c-torture/execute/complex-7.c)

2008-08-13  H.J. Lu  <hongjiu.lu@intel.com>

	PR middle-end/36701
	* expr.c (emit_group_store): Allocate stack temp with the
	largest alignment when copying from register to stack.

From-SVN: r139062

gcc/ChangeLog

+2008-08-13  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR middle-end/36701
+	* expr.c (emit_group_store): Allocate stack temp with the
+	largest alignment when copying from register to stack.
+
 2008-08-13  Richard Guenther  <rguenther@suse.de>
 
 	* tree.h (maybe_fold_offset_to_address): Declare.

gcc/expr.c

@@ -2074,12 +2074,31 @@ emit_group_store (rtx orig_dst, rtx src, tree type ATTRIBUTE_UNUSED, int ssize)
 	    }
 	  else
 	    {
-	      gcc_assert (bytepos == 0 && XVECLEN (src, 0));
-	      dest = assign_stack_temp (GET_MODE (dest),
-				        GET_MODE_SIZE (GET_MODE (dest)), 0);
-	      emit_move_insn (adjust_address (dest, GET_MODE (tmps[i]), bytepos),
-			      tmps[i]);
-	      dst = dest;
+	      enum machine_mode dest_mode = GET_MODE (dest);
+	      enum machine_mode tmp_mode = GET_MODE (tmps[i]);
+	      int dest_size = GET_MODE_SIZE (dest_mode);
+	      int tmp_size = GET_MODE_SIZE (tmp_mode);
+
+	      gcc_assert (bytepos == 0
+			  && XVECLEN (src, 0)
+			  && dest_size == tmp_size);
+
+	      if (GET_MODE_ALIGNMENT (dest_mode)
+		  >= GET_MODE_ALIGNMENT (tmp_mode))
+		{
+		  dest = assign_stack_temp (dest_mode, dest_size, 0);
+		  emit_move_insn (adjust_address (dest,
+						  tmp_mode,
+						  bytepos),
+				  tmps[i]);
+		  dst = dest;
+		}
+	      else
+		{
+		  dest = assign_stack_temp (tmp_mode, tmp_size, 0);
+		  emit_move_insn (dest, tmps[i]);
+		  dst = adjust_address (dest, dest_mode, bytepos);
+		}
 	      break;
 	    }
 	}