+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
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
-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
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
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. */
/* 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;
}
/* 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;
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),