[PATCH] Fixup missing host_integerp call

[Richard Guenther]

This fixes a missed check before calling tree_int_cst_low.

Bootstrapped and tested on x86_64-unknown-linux-gnu, applied.

Richard.

2011-04-11  Richard Guenther  <rguent...@suse.de>

        * gimplify.c (gimple_fold_indirect_ref): Check host_integerp
        before calling tree_low_cst.

Index: gcc/gimplify.c
===================================================================
*** gcc/gimplify.c      (revision 172252)
--- gcc/gimplify.c      (working copy)
*************** gimple_fold_indirect_ref (tree t)
*** 4079,4087 ****
        /* ((foo*)&vectorfoo)[1] -> BIT_FIELD_REF<vectorfoo,...> */
        if (TREE_CODE (addr) == ADDR_EXPR
          && TREE_CODE (TREE_TYPE (addrtype)) == VECTOR_TYPE
!         && useless_type_conversion_p (type, TREE_TYPE (TREE_TYPE (addrtype))))
        {
!           HOST_WIDE_INT offset = tree_low_cst (off, 0);
            tree part_width = TYPE_SIZE (type);
            unsigned HOST_WIDE_INT part_widthi
              = tree_low_cst (part_width, 0) / BITS_PER_UNIT;
--- 4079,4088 ----
        /* ((foo*)&vectorfoo)[1] -> BIT_FIELD_REF<vectorfoo,...> */
        if (TREE_CODE (addr) == ADDR_EXPR
          && TREE_CODE (TREE_TYPE (addrtype)) == VECTOR_TYPE
!         && useless_type_conversion_p (type, TREE_TYPE (TREE_TYPE (addrtype)))
!         && host_integerp (off, 1))
        {
!           unsigned HOST_WIDE_INT offset = tree_low_cst (off, 1);
            tree part_width = TYPE_SIZE (type);
            unsigned HOST_WIDE_INT part_widthi
              = tree_low_cst (part_width, 0) / BITS_PER_UNIT;