https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62030
vries at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |vries at gcc dot gnu.org
--- Comment #2 from vries at gcc dot gnu.org ---
I think the test-case is reading an undefined value from n->next, but that's
easy enough to fix with an intializer for node.
Taking the tentative patch from PR62004, (
https://gcc.gnu.org/bugzilla/attachment.cgi?id=33242&action=diff ), with this
patch added prevents the if-conversion in this case:
...
@@ -2504,7 +2534,9 @@ noce_process_if_block (struct noce_if_info *if_info)
if (! insn_b
|| insn_b != last_active_insn (else_bb, FALSE)
|| (set_b = single_set (insn_b)) == NULL_RTX
- || ! rtx_equal_p (x, SET_DEST (set_b)))
+ || ! (rtx_equal_p (x, SET_DEST (set_b))
+ && (GET_CODE (x) != MEM
+ || mem_interchangeable_p (x, SET_DEST (set_b))))
return FALSE;
}
else
...
