alpha.h (alpha_expand_mov): Return false if force_const_mem returns NULL_RTX.

	* config/alpha/alpha.h (alpha_expand_mov): Return false if
	force_const_mem returns NULL_RTX.

From-SVN: r144450

gcc/ChangeLog

+2009-02-26  Uros Bizjak  <ubizjak@gmail.com>
+
+	* config/alpha/alpha.h (alpha_expand_mov): Return false if
+	force_const_mem returns NULL_RTX.
+
 2009-02-25  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR rtl-optimization/39241
@@ -36,8 +41,7 @@
 2009-02-24  Sandra Loosemore  <sandra@codesourcery.com>
 
 	* doc/invoke.texi (Link Options): Document an easier way to pass
-	options that take arguments to the GNU linker using -Xlinker and
-	-Wl.
+	options that take arguments to the GNU linker using -Xlinker and -Wl.
 
 2009-02-24  Steve Ellcey  <sje@cup.hp.com>
 
@@ -74,20 +78,21 @@
 2009-02-23  Jan Hubicka  <jh@suse.cz>
 
 	PR c/12245
-	* ggc.h (htab_create_ggc): Use ggc_free to free hashtable when resizing.
+	* ggc.h (htab_create_ggc): Use ggc_free to free hashtable when
+	resizing.
 
 2009-02-23  Jan Hubicka  <jh@suse.cz>
 
-	PR tree-optimization/37709                                              
-	* tree.c (block_ultimate_origin): Move here from dwarf2out.             
-	* tree.h (block_ultimate_origin): Declare.                              
-	* dwarf2out.c (block_ultimate_origin): Move to tree.c                   
+	PR tree-optimization/37709
+	* tree.c (block_ultimate_origin): Move here from dwarf2out.
+	* tree.h (block_ultimate_origin): Declare.
+	* dwarf2out.c (block_ultimate_origin): Move to tree.c
 	* tree-ssa-live.c (remove_unused_scope_block_p):
 	Eliminate blocks containig no instructions nor live variables nor
 	nested blocks.
 	(dump_scope_block): New function.
 	(remove_unused_locals): Enable removal of dead blocks by default;
-	enable dumping at TDF_DETAILS.                                          
+	enable dumping at TDF_DETAILS.
 
 2009-02-21  H.J. Lu  <hongjiu.lu@intel.com>
 

gcc/config/alpha/alpha.c

@@ -2124,6 +2124,8 @@ alpha_split_const_mov (enum machine_mode mode, rtx *operands)
 bool
 alpha_expand_mov (enum machine_mode mode, rtx *operands)
 {
+  rtx tmp;
+
   /* If the output is not a register, the input must be.  */
   if (GET_CODE (operands[0]) == MEM
       && ! reg_or_0_operand (operands[1], mode))
@@ -2132,8 +2134,6 @@ alpha_expand_mov (enum machine_mode mode, rtx *operands)
   /* Allow legitimize_address to perform some simplifications.  */
   if (mode == Pmode && symbolic_operand (operands[1], mode))
     {
-      rtx tmp;
-
       tmp = alpha_legitimize_address (operands[1], operands[0], mode);
       if (tmp)
 	{
@@ -2158,14 +2158,18 @@ alpha_expand_mov (enum machine_mode mode, rtx *operands)
     }
 
   /* Otherwise we've nothing left but to drop the thing to memory.  */
-  operands[1] = force_const_mem (mode, operands[1]);
+  tmp = force_const_mem (mode, operands[1]);
+
+  if (tmp == NULL_RTX)
+    return false;
+
   if (reload_in_progress)
     {
-      emit_move_insn (operands[0], XEXP (operands[1], 0));
-      operands[1] = replace_equiv_address (operands[1], operands[0]);
+      emit_move_insn (operands[0], XEXP (tmp, 0));
+      operands[1] = replace_equiv_address (tmp, operands[0]);
     }
   else
-    operands[1] = validize_mem (operands[1]);
+    operands[1] = validize_mem (tmp);
   return false;
 }