[PATCH] Fix PR54826

[Dehao Chen]

Hi,

This patch fixes PR54826. When lowering the gimple, the block for call
arg also need to be reset.

Bootstrapped and passed gcc regression test on x86.

Okay for trunk?

Thanks,
Dehao

2012-10-05  Dehao Chen  <de...@google.com>

        * gimple-low.c (lower_stmt): Set the block for call args.

Index: gcc/gimple-low.c
===================================================================
--- gcc/gimple-low.c    (revision 192147)
+++ gcc/gimple-low.c    (working copy)
@@ -425,7 +425,15 @@ lower_stmt (gimple_stmt_iterator *gsi, struct lowe
     case GIMPLE_CALL:
       {
        tree decl = gimple_call_fndecl (stmt);
+       unsigned i;
 
+       for (i = 0; i < gimple_call_num_args (stmt); i++)
+         {
+           tree arg = gimple_call_arg (stmt, i);
+           if (EXPR_P (arg))
+             TREE_SET_BLOCK (arg, data->block);
+         }
+
        if (decl
            && DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL
            && DECL_FUNCTION_CODE (decl) == BUILT_IN_SETJMP)