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/* Scheduler hooks for IA-32 which implement atom+ specific logic.
Copyright (C) 1988-2017 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GCC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "backend.h"
#include "rtl.h"
#include "tree.h"
#include "cfghooks.h"
#include "tm_p.h"
#include "insn-config.h"
#include "insn-attr.h"
#include "recog.h"
#include "target.h"
#include "rtl-iter.h"
#include "regset.h"
#include "sched-int.h"
/* Try to reorder ready list to take advantage of Atom pipelined IMUL
execution. It is applied if
(1) IMUL instruction is on the top of list;
(2) There exists the only producer of independent IMUL instruction in
ready list.
Return index of IMUL producer if it was found and -1 otherwise. */
static int
do_reorder_for_imul (rtx_insn **ready, int n_ready)
{
rtx_insn *insn;
rtx set, insn1, insn2;
sd_iterator_def sd_it;
dep_t dep;
int index = -1;
int i;
if (!TARGET_BONNELL)
return index;
/* Check that IMUL instruction is on the top of ready list. */
insn = ready[n_ready - 1];
set = single_set (insn);
if (!set)
return index;
if (!(GET_CODE (SET_SRC (set)) == MULT
&& GET_MODE (SET_SRC (set)) == SImode))
return index;
/* Search for producer of independent IMUL instruction. */
for (i = n_ready - 2; i >= 0; i--)
{
insn = ready[i];
if (!NONDEBUG_INSN_P (insn))
continue;
/* Skip IMUL instruction. */
insn2 = PATTERN (insn);
if (GET_CODE (insn2) == PARALLEL)
insn2 = XVECEXP (insn2, 0, 0);
if (GET_CODE (insn2) == SET
&& GET_CODE (SET_SRC (insn2)) == MULT
&& GET_MODE (SET_SRC (insn2)) == SImode)
continue;
FOR_EACH_DEP (insn, SD_LIST_FORW, sd_it, dep)
{
rtx con;
con = DEP_CON (dep);
if (!NONDEBUG_INSN_P (con))
continue;
insn1 = PATTERN (con);
if (GET_CODE (insn1) == PARALLEL)
insn1 = XVECEXP (insn1, 0, 0);
if (GET_CODE (insn1) == SET
&& GET_CODE (SET_SRC (insn1)) == MULT
&& GET_MODE (SET_SRC (insn1)) == SImode)
{
sd_iterator_def sd_it1;
dep_t dep1;
/* Check if there is no other dependee for IMUL. */
index = i;
FOR_EACH_DEP (con, SD_LIST_BACK, sd_it1, dep1)
{
rtx pro;
pro = DEP_PRO (dep1);
if (!NONDEBUG_INSN_P (pro))
continue;
if (pro != insn)
index = -1;
}
if (index >= 0)
break;
}
}
if (index >= 0)
break;
}
return index;
}
/* Try to find the best candidate on the top of ready list if two insns
have the same priority - candidate is best if its dependees were
scheduled earlier. Applied for Silvermont only.
Return true if top 2 insns must be interchanged. */
static bool
swap_top_of_ready_list (rtx_insn **ready, int n_ready)
{
rtx_insn *top = ready[n_ready - 1];
rtx_insn *next = ready[n_ready - 2];
rtx set;
sd_iterator_def sd_it;
dep_t dep;
int clock1 = -1;
int clock2 = -1;
#define INSN_TICK(INSN) (HID (INSN)->tick)
if (!TARGET_SILVERMONT && !TARGET_INTEL)
return false;
if (!NONDEBUG_INSN_P (top))
return false;
if (!NONJUMP_INSN_P (top))
return false;
if (!NONDEBUG_INSN_P (next))
return false;
if (!NONJUMP_INSN_P (next))
return false;
set = single_set (top);
if (!set)
return false;
set = single_set (next);
if (!set)
return false;
if (INSN_PRIORITY_KNOWN (top) && INSN_PRIORITY_KNOWN (next))
{
if (INSN_PRIORITY (top) != INSN_PRIORITY (next))
return false;
/* Determine winner more precise. */
FOR_EACH_DEP (top, SD_LIST_RES_BACK, sd_it, dep)
{
rtx pro;
pro = DEP_PRO (dep);
if (!NONDEBUG_INSN_P (pro))
continue;
if (INSN_TICK (pro) > clock1)
clock1 = INSN_TICK (pro);
}
FOR_EACH_DEP (next, SD_LIST_RES_BACK, sd_it, dep)
{
rtx pro;
pro = DEP_PRO (dep);
if (!NONDEBUG_INSN_P (pro))
continue;
if (INSN_TICK (pro) > clock2)
clock2 = INSN_TICK (pro);
}
if (clock1 == clock2)
{
/* Determine winner - load must win. */
enum attr_memory memory1, memory2;
memory1 = get_attr_memory (top);
memory2 = get_attr_memory (next);
if (memory2 == MEMORY_LOAD && memory1 != MEMORY_LOAD)
return true;
}
return (bool) (clock2 < clock1);
}
return false;
#undef INSN_TICK
}
/* Perform possible reodering of ready list for Atom/Silvermont only.
Return issue rate. */
int
ix86_atom_sched_reorder (FILE *dump, int sched_verbose, rtx_insn **ready,
int *pn_ready, int clock_var)
{
int issue_rate = -1;
int n_ready = *pn_ready;
int i;
rtx_insn *insn;
int index = -1;
/* Set up issue rate. */
issue_rate = ix86_issue_rate ();
/* Do reodering for BONNELL/SILVERMONT only. */
if (!TARGET_BONNELL && !TARGET_SILVERMONT && !TARGET_INTEL)
return issue_rate;
/* Nothing to do if ready list contains only 1 instruction. */
if (n_ready <= 1)
return issue_rate;
/* Do reodering for post-reload scheduler only. */
if (!reload_completed)
return issue_rate;
if ((index = do_reorder_for_imul (ready, n_ready)) >= 0)
{
if (sched_verbose > 1)
fprintf (dump, ";;\tatom sched_reorder: put %d insn on top\n",
INSN_UID (ready[index]));
/* Put IMUL producer (ready[index]) at the top of ready list. */
insn = ready[index];
for (i = index; i < n_ready - 1; i++)
ready[i] = ready[i + 1];
ready[n_ready - 1] = insn;
return issue_rate;
}
/* Skip selective scheduling since HID is not populated in it. */
if (clock_var != 0
&& !sel_sched_p ()
&& swap_top_of_ready_list (ready, n_ready))
{
if (sched_verbose > 1)
fprintf (dump, ";;\tslm sched_reorder: swap %d and %d insns\n",
INSN_UID (ready[n_ready - 1]), INSN_UID (ready[n_ready - 2]));
/* Swap 2 top elements of ready list. */
insn = ready[n_ready - 1];
ready[n_ready - 1] = ready[n_ready - 2];
ready[n_ready - 2] = insn;
}
return issue_rate;
}
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