Haifa scheduler: Prevent splitting of fusion pairs in dispatch scheduling

gcc/Changelog

	* haifa-sched.cc (choose_ready): Don't require dfa_lookahead <= 0
	to schedule SCHED_GROUP_P insns first.

diff --git a/gcc/haifa-sched.cc b/gcc/haifa-sched.cc
index 63eb06b2d820b86f39def44be97df37a7a498290..58e04eee0dbab65fd3acf0ee86bde93c6d998ef2 100644 (file)
--- a/gcc/haifa-sched.cc
+++ b/gcc/haifa-sched.cc
@@ -6132,8 +6132,13 @@ choose_ready (struct ready_list *ready, bool first_cycle_insn_p,
       return -1;
     }
 
-  if (dfa_lookahead <= 0 || SCHED_GROUP_P (ready_element (ready, 0))
+  if (SCHED_GROUP_P (ready_element (ready, 0))
       || DEBUG_INSN_P (ready_element (ready, 0)))
+    {
+      *insn_ptr = ready_remove_first (ready);
+      return 0;
+    }
+  else if (dfa_lookahead <= 0)
     {
       if (targetm.sched.dispatch (NULL, IS_DISPATCH_ON))
        *insn_ptr = ready_remove_first_dispatch (ready);