From a01b319fccabf29a461c611632cbd848c7ea2930 Mon Sep 17 00:00:00 2001 From: shivac Date: Wed, 4 May 2016 16:37:19 +0800 Subject: [PATCH 6/7] skip the loop if the loop size too small --- gcc/modulo-sched.c | 8 ++++++++ gcc/params.def | 4 ++++ 2 files changed, 12 insertions(+) diff --git a/gcc/modulo-sched.c b/gcc/modulo-sched.c index ce2c338..890b543 100644 --- a/gcc/modulo-sched.c +++ b/gcc/modulo-sched.c @@ -1936,6 +1936,14 @@ sms_schedule (void) continue; } + if (num_loop_insns (loop) < PARAM_VALUE (PARAM_SMS_LOOP_MIN_SIZE)) + { + if (dump_file) + fprintf (dump_file, "SMS loop size = %d is too small\n", + num_loop_insns (loop)); + continue; + } + if ((non_sms_insn = loop_sms_insn_check (loop))) { if (dump_file) diff --git a/gcc/params.def b/gcc/params.def index 9e05401..8fa812f 100644 --- a/gcc/params.def +++ b/gcc/params.def @@ -375,6 +375,10 @@ DEFPARAM(PARAM_SMS_LOOP_AVERAGE_COUNT_THRESHOLD, "sms-loop-average-count-threshold", "A threshold on the average loop count considered by the swing modulo scheduler.", 0, 0, 0) +DEFPARAM(PARAM_SMS_LOOP_MIN_SIZE, + "sms-loop-min-size", + "A threshold on the loop instruction count considered by the swing modulo scheduler", + 8, 0, 0) DEFPARAM(HOT_BB_COUNT_WS_PERMILLE, "hot-bb-count-ws-permille", -- 2.5.0