https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79529
--- Comment #1 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
Looks reasonable, thanks.
I would probably check for def == NULL too, just in case:
if (!def || gimple_nop_p (def))
return true;
...since I see that replace_ssa_name can set it to NULL:
/* Now that we've used the def stmt to define new_name, make sure it
doesn't define name anymore. */
SSA_NAME_DEF_STMT (name) = NULL;
Would you care to test and submit a patch to the list?
