From 3e2fdd240f8000068f78fd76898f4700ed2926ca Mon Sep 17 00:00:00 2001 From: Revital Eres Date: Sun, 17 Apr 2011 14:32:24 +0000 Subject: [PATCH] New flag to apply SMS when SC equals 1 From-SVN: r172610 --- gcc/ChangeLog | 6 ++++++ gcc/doc/invoke.texi | 4 ++++ gcc/modulo-sched.c | 7 ++++--- gcc/params.def | 5 +++++ 4 files changed, 19 insertions(+), 3 deletions(-) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 23199ca80b3..73f304d0788 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2011-04-17 Revital Eres + + * params.def (sms-min-sc): New param flag. + * modulo-sched.c (sms_schedule): Use it. + * doc/invoke.texi (sms-min-sc): Document it. + 2011-04-17 Jan Hubicka * lto-symtab.c (lto_cgraph_replace_node): When call statement is diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 89eb525caa9..7ca4405a18f 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -8700,6 +8700,10 @@ through which the instruction may be pipelined. The default value is 2. The maximum number of best instructions in the ready list that are considered for renaming in the selective scheduler. The default value is 2. +@item sms-min-sc +The minimum value of stage count that swing modulo scheduler will +generate. The default value is 2. + @item max-last-value-rtl The maximum size measured as number of RTLs that can be recorded in an expression in combiner for a pseudo register as last known value of that register. The default diff --git a/gcc/modulo-sched.c b/gcc/modulo-sched.c index 73317444ff7..f37d743e287 100644 --- a/gcc/modulo-sched.c +++ b/gcc/modulo-sched.c @@ -1162,9 +1162,10 @@ sms_schedule (void) gcc_assert(stage_count >= 1); } - /* Stage count of 1 means that there is no interleaving between - iterations, let the scheduling passes do the job. */ - if (stage_count <= 1 + /* The default value of PARAM_SMS_MIN_SC is 2 as stage count of + 1 means that there is no interleaving between iterations thus + we let the scheduling passes do the job in this case. */ + if (stage_count < (unsigned) PARAM_VALUE (PARAM_SMS_MIN_SC) || (count_init && (loop_count <= stage_count)) || (flag_branch_probabilities && (trip_count <= stage_count))) { diff --git a/gcc/params.def b/gcc/params.def index 81fdfcdf500..5e8be211394 100644 --- a/gcc/params.def +++ b/gcc/params.def @@ -334,6 +334,11 @@ DEFPARAM(PARAM_SMS_MAX_II_FACTOR, "sms-max-ii-factor", "A factor for tuning the upper bound that swing modulo scheduler uses for scheduling a loop", 100, 0, 0) +/* The minimum value of stage count that swing modulo scheduler will generate. */ +DEFPARAM(PARAM_SMS_MIN_SC, + "sms-min-sc", + "The minimum value of stage count that swing modulo scheduler will generate.", + 2, 1, 1) DEFPARAM(PARAM_SMS_DFA_HISTORY, "sms-dfa-history", "The number of cycles the swing modulo scheduler considers when checking conflicts using DFA", -- 2.30.2