https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90244
Bug ID: 90244
Summary: [UBSAN]: in get_object_alignment_2
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: dcb314 at hotmail dot com
Target Milestone: ---
Following on from PR 85164, I tried out a UBSAN version of
gcc trunk with test suite file gcc.dg/Warray-bounds-22.c
and flag -O2 and got this:
../../trunk/gcc/poly-int.h:1095:5: runtime error: signed integer overflow:
92233
72036854775807 * 8 cannot be represented in type 'long int'
#0 0xf85e20 in poly_int<1u, poly_result<long, if_nonpoly<int, int,
poly_int_
traits<int>::is_poly>::type, poly_coeff_pair_traits<long, if_nonpoly<int, int,
p
oly_int_traits<int>::is_poly>::type>::result_kind>::type> operator*<1u, long,
in
t>(poly_int_pod<1u, long> const&, int const&) ../../trunk/gcc/poly-int.h:1095
#1 0xf85e20 in get_object_alignment_2 ../../trunk/gcc/builtins.c:344
#2 0xf86d9d in get_object_alignment_1(tree_node*, unsigned int*, unsigned
lo
ng*) ../../trunk/gcc/builtins.c:394
#3 0xf86d9d in get_object_alignment(tree_node*)
../../trunk/gcc/builtins.c:4
05
#4 0x1690d75 in expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expan
d_modifier, rtx_def**, bool) ../../trunk/gcc/expr.c:10343
#5 0x16939b8 in expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expan
d_modifier, rtx_def**, bool) ../../trunk/gcc/expr.c:9947
#6 0x16ecf5c in expand_expr ../../trunk/gcc/expr.h:279
