2009-07-13 Ghassan Shobaki <ghassan.shobaki@amd.com>

* haifa-sched.c 
	(rank_for_schedule): Introduced flags to enable/disable 
	individual scheduling heuristics.
	* common.opt: Introduced flags to enable/disable
        individual heuristics in the scheduler.	
	* doc/invoke.texi: Introduced flags to enable/disable
        individual heuristics in the scheduler.

From-SVN: r149603

gcc/ChangeLog

@@ -1,3 +1,13 @@
+2009-07-13  Ghassan Shobaki  <ghassan.shobaki@amd.com>
+	
+	* haifa-sched.c 
+	(rank_for_schedule): Introduced flags to enable/disable 
+	individual scheduling heuristics.
+	* common.opt: Introduced flags to enable/disable
+        individual heuristics in the scheduler.	
+	* doc/invoke.texi: Introduced flags to enable/disable
+        individual heuristics in the scheduler.
+	
 2009-07-13  Kai Tietz  <kai.tietz@onevision.com>
 
 	* config/i386/t-gthr-win32 (LIB2FUNCS_EXTRA): Remove file

gcc/common.opt

@@ -1056,6 +1056,34 @@ fsched-stalled-insns-dep=
 Common RejectNegative Joined UInteger
 -fsched-stalled-insns-dep=<number>	Set dependence distance checking in premature scheduling of queued insns
 
+fsched-group-heuristic
+Common Report Var(flag_sched_group_heuristic) Init(1) Optimization
+Enable the group heuristic in the scheduler
+
+fsched-critical-path-heuristic
+Common Report Var(flag_sched_critical_path_heuristic) Init(1) Optimization
+Enable the critical path heuristic in the scheduler
+
+fsched-spec-insn-heuristic
+Common Report Var(flag_sched_spec_insn_heuristic) Init(1) Optimization
+Enable the speculative instruction heuristic in the scheduler
+
+fsched-reg-pressure-heuristic
+Common Report Var(flag_sched_reg_pressure_heuristic) Init(1) Optimization
+Enable the register pressure heuristic in the scheduler
+
+fsched-rank-heuristic
+Common Report Var(flag_sched_rank_heuristic) Init(1) Optimization
+Enable the rank heuristic in the scheduler
+
+fsched-last-insn-heuristic
+Common Report Var(flag_sched_last_insn_heuristic) Init(1) Optimization
+Enable the last instruction heuristic in the scheduler
+
+fsched-dep-count-heuristic
+Common Report Var(flag_sched_dep_count_heuristic) Init(1) Optimization
+Enable the dependent count heuristic in the scheduler
+
 fsection-anchors
 Common Report Var(flag_section_anchors) Optimization
 Access data in the same section from shared anchor points

gcc/doc/invoke.texi

@@ -364,6 +364,10 @@ Objective-C and Objective-C++ Dialects}.
 -frounding-math -fsched2-use-superblocks @gol
 -fsched2-use-traces -fsched-spec-load -fsched-spec-load-dangerous @gol
 -fsched-stalled-insns-dep[=@var{n}] -fsched-stalled-insns[=@var{n}] @gol
+-fsched-group-heuristic -fsched-critical-path-heuristic @gol
+-fsched-spec-insn-heuristic -fsched-reg-pressure-heuristic @gol
+-fsched-rank-heuristic -fsched-last-insn-heuristic @gol
+-fsched-dep-count-heuristic @gol
 -fschedule-insns -fschedule-insns2 -fsection-anchors @gol
 -fselective-scheduling -fselective-scheduling2 @gol
 -fsel-sched-pipelining -fsel-sched-pipelining-outer-loops @gol
@@ -6229,6 +6233,49 @@ results from the algorithm.
 This only makes sense when scheduling after register allocation, i.e.@: with
 @option{-fschedule-insns2} or at @option{-O2} or higher.
 
+@item -fsched-group-heuristic
+@opindex fsched-group-heuristic
+Enable the group heuristic in the scheduler.  This is enabled by default
+when scheduling is enabled, i.e.@: with @option{-fschedule-insns} 
+or @option{-fschedule-insns2} or at @option{-O2} or higher.
+
+@item -fsched-critical-path-heuristic
+@opindex fsched-critical-path-heuristic
+Enable the critical-path heuristic in the scheduler.  This is enabled 
+by default when scheduling is enabled, i.e.@: with @option{-fschedule-insns} 
+or @option{-fschedule-insns2} or at @option{-O2} or higher.
+
+@item -fsched-spec-insn-heuristic
+@opindex fsched-spec-insn-heuristic
+Enable the speculative instruction heuristic in the scheduler.  This is 
+enabled by default when scheduling is enabled, i.e.@: with 
+@option{-fschedule-insns} or @option{-fschedule-insns2} or 
+at @option{-O2} or higher.
+
+@item -fsched-reg-pressure-heuristic
+@opindex fsched-reg-pressure-heuristic
+Enable the register pressure heuristic in the scheduler.  This only makes  
+sense when scheduling before register allocation, i.e.@: 
+with @option{-fschedule-insns} or at @option{-O2} or higher.
+
+@item -fsched-rank-heuristic
+@opindex fsched-rank-heuristic
+Enable the rank heuristic in the scheduler.  This is enabled by default 
+when scheduling is enabled, i.e.@: with @option{-fschedule-insns} 
+or @option{-fschedule-insns2} or at @option{-O2} or higher.
+
+@item -fsched-last-insn-heuristic
+@opindex fsched-last-insn-heuristic
+Enable the last-instruction heuristic in the scheduler.  This is enabled 
+by default when scheduling is enabled, i.e.@: with @option{-fschedule-insns} 
+or @option{-fschedule-insns2} or at @option{-O2} or higher.
+
+@item -fsched-dep-count-heuristic
+@opindex fsched-dep-count-heuristic
+Enable the dependent-count heuristic in the scheduler.  This is enabled 
+by default when scheduling is enabled, i.e.@: with @option{-fschedule-insns} 
+or @option{-fschedule-insns2} or at @option{-O2} or higher.
+
 @item -fsched2-use-traces
 @opindex fsched2-use-traces
 Use @option{-fsched2-use-superblocks} algorithm when scheduling after register

gcc/haifa-sched.c

@@ -890,7 +890,8 @@ rank_for_schedule (const void *x, const void *y)
   int val, priority_val, weight_val, info_val;
 
   /* The insn in a schedule group should be issued the first.  */
-  if (SCHED_GROUP_P (tmp) != SCHED_GROUP_P (tmp2))
+  if (flag_sched_group_heuristic && 
+      SCHED_GROUP_P (tmp) != SCHED_GROUP_P (tmp2))
     return SCHED_GROUP_P (tmp2) ? 1 : -1;
 
   /* Make sure that priority of TMP and TMP2 are initialized.  */
@@ -899,11 +900,11 @@ rank_for_schedule (const void *x, const void *y)
   /* Prefer insn with higher priority.  */
   priority_val = INSN_PRIORITY (tmp2) - INSN_PRIORITY (tmp);
 
-  if (priority_val)
+  if (flag_sched_critical_path_heuristic && priority_val)
     return priority_val;
 
   /* Prefer speculative insn with greater dependencies weakness.  */
-  if (spec_info)
+  if (flag_sched_spec_insn_heuristic && spec_info)
     {
       ds_t ds1, ds2;
       dw_t dw1, dw2;
@@ -927,16 +928,16 @@ rank_for_schedule (const void *x, const void *y)
     }
 
   /* Prefer an insn with smaller contribution to registers-pressure.  */
-  if (!reload_completed &&
+  if (flag_sched_reg_pressure_heuristic && !reload_completed &&
       (weight_val = INSN_REG_WEIGHT (tmp) - INSN_REG_WEIGHT (tmp2)))
     return weight_val;
 
   info_val = (*current_sched_info->rank) (tmp, tmp2);
-  if (info_val)
+  if(flag_sched_rank_heuristic && info_val)
     return info_val;
 
   /* Compare insns based on their relation to the last-scheduled-insn.  */
-  if (INSN_P (last_scheduled_insn))
+  if (flag_sched_last_insn_heuristic && INSN_P (last_scheduled_insn))
     {
       dep_t dep1;
       dep_t dep2;
@@ -977,7 +978,7 @@ rank_for_schedule (const void *x, const void *y)
   val = (sd_lists_size (tmp2, SD_LIST_FORW)
 	 - sd_lists_size (tmp, SD_LIST_FORW));
 
-  if (val != 0)
+  if (flag_sched_dep_count_heuristic && val != 0)
     return val;
 
   /* If insns are equally good, sort by INSN_LUID (original insn order),