[PATCH]: handle size_t /= ptr size in tree-ssa-strlen.c

[Tristan Gingold]

Hi,

get_string_length assumes that precision of size_t is the same as precision of 
a pointer, which isn't always true at least on VMS.
This patch simply add a conversion in case of mismatch.

Tested on ia64/VMS by cross-bootstrapping.
Bootstrapped and regtested on i386/GNU Linux.

Ok for trunk ?

Tristan.

2012-05-04  Tristan Gingold  <ging...@adacore.com>

        * tree-ssa-strlen.c (get_string_length): Convert lhs if needed.

diff --git a/gcc/tree-ssa-strlen.c b/gcc/tree-ssa-strlen.c
index a37633a..bda5ffb 100644
--- a/gcc/tree-ssa-strlen.c
+++ b/gcc/tree-ssa-strlen.c
@@ -427,6 +427,12 @@ get_string_length (strinfo si)
                                    NULL);
          add_referenced_var (lhs_var);
          tem = gimple_call_arg (stmt, 0);
+          if (!useless_type_conversion_p (sizetype, TREE_TYPE (lhs)))
+            {
+              lhs = convert_to_ptrofftype (lhs);
+              lhs = force_gimple_operand_gsi (&gsi, lhs, true, NULL_TREE,
+                                              true, GSI_SAME_STMT);
+            }
          lenstmt
            = gimple_build_assign_with_ops (POINTER_PLUS_EXPR,
                                            make_ssa_name (lhs_var, NULL),