https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80171
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot
gnu.org
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
On trunk:
#1 0x000000000173ef58 in generic_simplify_VIEW_CONVERT_EXPR (loc=0,
code=VIEW_CONVERT_EXPR, type=<integer_type 0x7ffff6a00f18 size_t>,
op0=<tree 0x0>) at generic-match.c:9836
9836 if ((0 && useless_type_conversion_p (type, TREE_TYPE
(captures[0]))) || (1 && type == TREE_TYPE (captures[0])))
(gdb) p captures[0]
$1 = (tree_node *) 0x0
#4 0x0000000000e05840 in fold_ctor_reference (
type=<integer_type 0x7ffff6a00f18 size_t>,
ctor=<addr_expr 0x7ffff677ac20>, offset=0, size=64,
from_decl=<var_decl 0x7ffff678a000
_ZTVN5padis12isislistener3tlv2te25IPv4NeighborAddressSubTlvE>)
at /space/rguenther/src/svn/gcc-7-branch/gcc/gimple-fold.c:6242
6242 ret = fold_unary (VIEW_CONVERT_EXPR, type, ret);
(gdb) p ret
$2 = <tree 0x0>
Simple fix (further reduced testcase appreciated)
Index: gcc/gimple-fold.c
===================================================================
--- gcc/gimple-fold.c (revision 246437)
+++ gcc/gimple-fold.c (working copy)
@@ -6239,9 +6239,12 @@ fold_ctor_reference (tree type, tree cto
&& !compare_tree_int (TYPE_SIZE (TREE_TYPE (ctor)), size))
{
ret = canonicalize_constructor_val (unshare_expr (ctor), from_decl);
- ret = fold_unary (VIEW_CONVERT_EXPR, type, ret);
if (ret)
- STRIP_USELESS_TYPE_CONVERSION (ret);
+ {
+ ret = fold_unary (VIEW_CONVERT_EXPR, type, ret);
+ if (ret)
+ STRIP_USELESS_TYPE_CONVERSION (ret);
+ }
return ret;
}
/* For constants and byte-aligned/sized reads try to go through
