https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103209
--- Comment #3 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
This is bug I introduced to tree-ssa-structalias where I reversed order of
flags which deterine global memory read and writes. So pure functions are
handled as functions writting global memory but not reading it. I am very
surprised it took so long to show as wrong code.
diff --git a/gcc/tree-ssa-structalias.c b/gcc/tree-ssa-structalias.c
index 153ddf57a61..34fd47fdf47 100644
--- a/gcc/tree-ssa-structalias.c
+++ b/gcc/tree-ssa-structalias.c
@@ -4996,7 +4996,7 @@ find_func_aliases_for_call (struct function *fn, gcall
*t)
reachable from their arguments, but they are not an escape
point for reachable memory of their arguments. */
else if (flags & (ECF_PURE|ECF_LOOPING_CONST_OR_PURE))
- handle_rhs_call (t, &rhsc, implicit_pure_eaf_flags, true, false);
+ handle_rhs_call (t, &rhsc, implicit_pure_eaf_flags, false, true);
/* If the call is to a replaceable operator delete and results
from a delete expression as opposed to a direct call to
such operator, then the effects for PTA (in particular
