https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79265
--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
Btw, for targets which default to -fno-delete-null-pointer-checks nonnull
sanitizing is of course pointless.
I think we should simply make sure to instrument early enough before things
are folded... or should restore -fdelete-null-pointer-checks after
instrumentation.
We also instrument
<bb 3> [0.00%]:
if ("%%" == 0B)
goto <bb 6>; [0.04%]
else
goto <bb 5>; [99.96%]
<bb 6> [0.00%]:
__builtin___ubsan_handle_nonnull_arg (&*.Lubsan_data1);
instrumenting "%%" looks pointless (again, instrumentation itself can
rely on -fdelete-null-pointer-checks semantics when deciding to elide
null pointer checks).
