re PR rtl-optimization/49235 (ICE: in int_mode_for_mode, at stor-layout.c:424…

re PR rtl-optimization/49235 (ICE: in int_mode_for_mode, at stor-layout.c:424 with -O -fno-delete-null-pointer-checks -fno-tree-scev-cprop -ftree-vectorize -fno-vect-cost-model)

	PR rtl-optimization/49235
	* tree-ssa-address.c (gen_addr_rtx): Ignore base if it is const0_rtx.
	(create_mem_ref_raw): Create MEM_REF even if base is INTEGER_CST.

	* gcc.dg/pr49235.c: New test.

From-SVN: r174478

gcc/ChangeLog

+2011-05-31  Jakub Jelinek  <jakub@redhat.com>
+
+	PR rtl-optimization/49235
+	* tree-ssa-address.c (gen_addr_rtx): Ignore base if it is const0_rtx.
+	(create_mem_ref_raw): Create MEM_REF even if base is INTEGER_CST.
+
 2011-05-31  Ira Rosen  <ira.rosen@linaro.org>
 
 	PR tree-optimization/49093

gcc/testsuite/ChangeLog

+2011-05-31  Jakub Jelinek  <jakub@redhat.com>
+
+	PR rtl-optimization/49235
+	* gcc.dg/pr49235.c: New test.
+
 2011-05-31  Ira Rosen  <ira.rosen@linaro.org>
 
 	PR tree-optimization/49093

gcc/testsuite/gcc.dg/pr49235.c

+/* PR rtl-optimization/49235 */
+/* { dg-do compile { target { int32plus } } } */
+/* { dg-options "-O -fno-delete-null-pointer-checks -fno-tree-scev-cprop -ftree-vectorize -fno-vect-cost-model -w" } */
+
+void
+foo (void)
+{
+  unsigned i;
+  unsigned *p = 0;
+  for (i = 0; i < 4; ++i)
+    *p++ = 0;
+  for (i = 0; i < 4; ++i)
+    *p++ = 0;
+}
+
+void
+bar (void)
+{
+  unsigned i;
+  unsigned *p = (unsigned *) (__UINTPTR_TYPE__) 0x12340000;
+  for (i = 0; i < 4; ++i)
+    *p++ = 0;
+  for (i = 0; i < 4; ++i)
+    *p++ = 0;
+}

gcc/tree-ssa-address.c

 /* Memory address lowering and addressing mode selection.
-   Copyright (C) 2004, 2006, 2007, 2008, 2009, 2010
+   Copyright (C) 2004, 2006, 2007, 2008, 2009, 2010, 2011
    Free Software Foundation, Inc.
 
 This file is part of GCC.
@@ -129,7 +129,7 @@ gen_addr_rtx (enum machine_mode address_mode,
       *addr = act_elem;
     }
 
-  if (base)
+  if (base && base != const0_rtx)
     {
       if (*addr)
 	*addr = simplify_gen_binary (PLUS, address_mode, base, *addr);
@@ -365,7 +365,7 @@ create_mem_ref_raw (tree type, tree alias_ptr_type, struct mem_address *addr,
      ???  As IVOPTs does not follow restrictions to where the base
      pointer may point to create a MEM_REF only if we know that
      base is valid.  */
-  if (TREE_CODE (base) == ADDR_EXPR
+  if ((TREE_CODE (base) == ADDR_EXPR || TREE_CODE (base) == INTEGER_CST)
       && (!index2 || integer_zerop (index2))
       && (!addr->index || integer_zerop (addr->index)))
     return fold_build2 (MEM_REF, type, base, addr->offset);