gnu /
gcc /
c1212d8d1ae719996123b2ea2aca2cd3ffc8a492 avoid null ptr deref in cselib_record_sets
Jeff Law tells me h8300-elf fails gcc.c-torture/compile/pr49029.c
with -O2 -g -mint32 -mh. This patch fixes it.
The problem is that strict low part handling in cselib_record_sets
assumes src_elt is not NULL. That src_elt is taken from a strict low
part set, but it won't always have a src_elt to begin with. In this
case, it's because src is a volatile MEM; we don't record values for
those.
Although we could fix the problem by testing for a NULL src_elt before
creating the zero extends corresponding to strict low part sets of
formerly const0_rtx REGs, there's no point in recording the additional
set that we won't be able to use anyway.
We could still record that the whole register has a zero-extend of
the value stored in the narrower-mode strict low part of the register,
but is that of any use? I guess not, but if we find otherwise, we can
change that later.
for gcc/ChangeLog
* cselib.c (cselib_record_sets): Skip strict low part sets
with NULL src_elt.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@266873 138bc75d-0d04-0410-961f-82ee72b054a4
2 files changed
