PATCH: PR tree-optimization/63828: [5 Regression] g++.dg/ipa/devirt-47.C fails for x32

[H.J. Lu]

Hi,

possible_placement_new checks if the structure is at least big enough to
hold the VPTR pointer.  But it uses BITS_PER_WORD for pointer size,
which is incorrect for many ILP32 targets.  This patch replaces it with
POINTER_SIZE.  Tested on Linux/x32.  OK for trunk?

Thanks.


H.J.
---
2014-11-12  H.J. Lu  <hongjiu...@intel.com>

        PR tree-optimization/63828
        * ipa-polymorphic-call.c (possible_placement_new): Check
        POINTER_SIZE, instead of BITS_PER_WORD, for pointer size.

diff --git a/gcc/ipa-polymorphic-call.c b/gcc/ipa-polymorphic-call.c
index 33dd1a8..30b5db2 100644
--- a/gcc/ipa-polymorphic-call.c
+++ b/gcc/ipa-polymorphic-call.c
@@ -106,7 +106,7 @@ possible_placement_new (tree type, tree expected_type,
 {
   return ((TREE_CODE (type) != RECORD_TYPE
           || !TYPE_BINFO (type)
-          || cur_offset >= BITS_PER_WORD
+          || cur_offset >= POINTER_SIZE
           || !polymorphic_type_binfo_p (TYPE_BINFO (type)))
          && (!TYPE_SIZE (type)
              || !tree_fits_shwi_p (TYPE_SIZE (type))