[multiple changes]

2012-01-24  Richard Guenther  <rguenther@suse.de>

	Forward-port to trunk
	2010-09-21  Jakub Jelinek  <jakub@redhat.com>

	PR middle-end/45678
	* expr.c (expand_expr_real_1) <case VIEW_CONVERT_EXPR>: If
	op0 isn't sufficiently aligned and there is movmisalignM
	insn for mode, use it to load op0 into a temporary register.

From-SVN: r183470

gcc/ChangeLog

+2012-01-24  Richard Guenther  <rguenther@suse.de>
+
+	Forward-port to trunk
+	2010-09-21  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/45678
+	* expr.c (expand_expr_real_1) <case VIEW_CONVERT_EXPR>: If
+	op0 isn't sufficiently aligned and there is movmisalignM
+	insn for mode, use it to load op0 into a temporary register.
+
 2012-01-24  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/51957

gcc/expr.c

@@ -10044,10 +10044,32 @@ expand_expr_real_1 (tree exp, rtx target, enum machine_mode tmode,
 	 results.  */
       if (MEM_P (op0))
 	{
+	  enum insn_code icode;
+
 	  op0 = copy_rtx (op0);
 
 	  if (TYPE_ALIGN_OK (type))
 	    set_mem_align (op0, MAX (MEM_ALIGN (op0), TYPE_ALIGN (type)));
+	  else if (mode != BLKmode
+		   && MEM_ALIGN (op0) < GET_MODE_ALIGNMENT (mode)
+		   /* If the target does have special handling for unaligned
+		      loads of mode then use them.  */
+		   && ((icode = optab_handler (movmisalign_optab, mode))
+		       != CODE_FOR_nothing))
+	    {
+	      rtx reg, insn;
+
+	      op0 = adjust_address (op0, mode, 0);
+	      /* We've already validated the memory, and we're creating a
+		 new pseudo destination.  The predicates really can't
+		 fail.  */
+	      reg = gen_reg_rtx (mode);
+
+	      /* Nor can the insn generator.  */
+	      insn = GEN_FCN (icode) (reg, op0);
+	      emit_insn (insn);
+	      return reg;
+	    }
 	  else if (STRICT_ALIGNMENT
 		   && mode != BLKmode
 		   && MEM_ALIGN (op0) < GET_MODE_ALIGNMENT (mode))