* haifa-sched.c (ok_for_early_schedule): New function.

        (early_queue_to_ready): New function.
        (schedule_block): Allow early removal of insns from Q.
        (schedule_insn): Update INSN_TICK in case of premature
        issue.
        * common.opt (sched_stalled_insns): New flag.
        (sched_stalled_insns_dep): New flag.
        * flags.h: Same above flags.
        * opts.c: Same as above.
        * toplev.c: Same as above.
        * target.h (targetm.sched.is_costly_dependence): New
        hook.
        * target-def.h: Same as above.
        * config/rs6000/rs6000.h: (rs6000_sched_costly_dep):
        Support new flag -msched-costly-dep.
        (DEFAULT_SCHED_COSTLY_DEP): Define.
        * config/rs6000/rs6000.c:
        (rs6000_is_costly_dependence): New function.
        (is_load_insn, is_store_insn): New functions.
        (is_load_insn1, is_store_insn1, is_mem_ref): New
        functions.
        * doc/invoke.texi (-fsched-stalled-insns-dep)
        (-fsched-stalled-insns, -msched-costly-dep): Document
        options.
        * doc/tm.texi (is_costly_dependence): Define new
        scheduler target hook.


git-svn-id: https://gcc.gnu.org/svn/gcc/trunk@72261 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 14 insertions, 0 deletions

diff --git a/gcc/flags.h b/gcc/flags.h
index 4d6ea074174..f345b497197 100644
--- a/gcc/flags.h
+++ b/gcc/flags.h
@@ -439,6 +439,20 @@ extern int flag_schedule_speculative;
 extern int flag_schedule_speculative_load;
 extern int flag_schedule_speculative_load_dangerous;
 
+/* The following flags have an effect during scheduling after register
+   allocation:   
+
+   sched_stalled_insns means that insns can be moved prematurely from the queue
+   of stalled insns into the ready list.
+
+   sched_stalled_insns_dep controls how many recently scheduled cycles will 
+   be examined for a dependency on a stalled insn that is candidate for
+   premature removal from the queue of stalled insns into the ready list (has 
+   an effect only if the flag 'sched_stalled_insns' is set).  */
+
+extern int flag_sched_stalled_insns;
+extern int flag_sched_stalled_insns_dep;
+
 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
    by a cheaper branch, on a count register.  */
 extern int flag_branch_on_count_reg;