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    /or1k/tags/stable_0_2_0_rc1/or1ksim/bpb
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Rev 1572 → Rev 1765

/Makefile.in
0,0 → 1,331
# Makefile.in generated by automake 1.6.3 from Makefile.am.
# @configure_input@
 
# Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002
# Free Software Foundation, Inc.
# This Makefile.in is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.
 
# This program is distributed in the hope that it will be useful,
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@SET_MAKE@
 
# Makefile -- Makefile for cpu architecture independent simulation
# Copyright (C) 1999 Damjan Lampret, lampret@opencores.org
#
# This file is part of OpenRISC 1000 Architectural Simulator.
#
# This program 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 2 of the License, or
# (at your option) any later version.
#
# This program 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.
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# Tell versions [3.59,3.63) of GNU make to not export all variables.
# Otherwise a system limit (for SysV at least) may be exceeded.
.NOEXPORT:
/branch_predict.c
0,0 → 1,285
/* branch_predict.c -- branch prediction simulation
Copyright (C) 1999 Damjan Lampret, lampret@opencores.org
This file is part of OpenRISC 1000 Architectural Simulator.
 
This program 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 2 of the License, or
(at your option) any later version.
 
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
 
/* Branch prediction functions.
At the moment this functions only simulate functionality of branch
prediction and do not influence on fetche/decode/execute stages.
They are here only to verify performance of various branch
prediction configurations.
*/
 
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <stdarg.h>
 
#include "config.h"
 
#ifdef HAVE_INTTYPES_H
#include <inttypes.h>
#endif
 
#include "port.h"
#include "arch.h"
#include "branch_predict.h"
#include "abstract.h"
#include "opcode/or32.h"
#include "stats.h"
#include "sim-config.h"
 
/* Branch prediction buffer */
 
/* Length of BPB */
#define BPB_LEN 64
 
/* Number of BPB ways (1, 2, 3 etc.). */
#define BPB_WAYS 1
 
/* Number of prediction states (2, 4, 8 etc.). */
#define BPB_PSTATES 2
 
/* Number of usage states (2, 3, 4 etc.). */
#define BPB_USTATES 2
 
/* branch prediction buffer entry */
struct bpb_entry {
struct {
oraddr_t addr; /* address of a branch insn */
int taken; /* taken == 1, not taken == 0 OR */
/* strongly taken == 3, taken == 2,
not taken == 1, strongly not taken == 0 */
int lru; /* least recently == 0 */
} way[BPB_WAYS];
} bpb[BPB_LEN];
 
void bpb_info()
{
if (!config.bpb.enabled) {
PRINTF("BPB not simulated. Check -bpb option.\n");
return;
}
PRINTF("BPB %d bytes: ", BPB_LEN * BPB_WAYS * (BPB_PSTATES + BPB_USTATES) / 8);
PRINTF("%d ways, %d sets, %d bits/prediction\n", BPB_WAYS, BPB_LEN, BPB_PSTATES + BPB_USTATES);
}
/* First check if branch is already in the cache and if it is:
- increment BPB hit stats,
- set 'lru' at this way to BPB_USTATES - 1 and
decrement 'lru' of other ways unless they have reached 0,
- increment correct/incorrect stats according to BPB 'taken' field
and 'taken' variable,
- increment or decrement BPB taken field according to 'taken' variable
and if not:
- increment BPB miss stats
- find lru way and entry and replace old address with 'addr' and
'taken' field with (BPB_PSTATES/2 - 1) + 'taken'
- set 'lru' with BPB_USTATES - 1 and decrement 'lru' of other
ways unless they have reached 0
*/
 
void bpb_update(oraddr_t addr, int taken)
{
int entry, way = -1;
int i;
 
/* BPB simulation enabled/disabled. */
if (!config.bpb.enabled)
return;
/* Calc entry. */
entry = addr % BPB_LEN;
/* Scan all ways and try to find our addr. */
for (i = 0; i < BPB_WAYS; i++)
if (bpb[entry].way[i].addr == addr)
way = i;
/* Did we find our cached branch? */
if (way >= 0) { /* Yes, we did. */
or1k_mstats.bpb.hit++;
for (i = 0; i < BPB_WAYS; i++)
if (bpb[entry].way[i].lru)
bpb[entry].way[i].lru--;
bpb[entry].way[way].lru = BPB_USTATES - 1;
if (bpb[entry].way[way].taken / (BPB_PSTATES / 2) == taken)
or1k_mstats.bpb.correct++;
else
or1k_mstats.bpb.incorrect++;
if (taken && (bpb[entry].way[way].taken < BPB_PSTATES - 1))
bpb[entry].way[way].taken++;
else
if (!taken && (bpb[entry].way[way].taken))
bpb[entry].way[way].taken--;
}
else { /* No, we didn't. */
int minlru = BPB_USTATES - 1;
int minway = 0;
or1k_mstats.bpb.miss++;
for (i = 0; i < BPB_WAYS; i++)
if (bpb[entry].way[i].lru < minlru)
minway = i;
bpb[entry].way[minway].addr = addr;
bpb[entry].way[minway].taken = (BPB_PSTATES / 2 - 1) + taken;
for (i = 0; i < BPB_WAYS; i++)
if (bpb[entry].way[i].lru)
bpb[entry].way[i].lru--;
bpb[entry].way[minway].lru = BPB_USTATES - 1;
}
}
 
/* Branch target instruction cache */
 
/* Length of BTIC */
#define BTIC_LEN 128
 
/* Number of BTIC ways (1, 2, 3 etc.). */
#define BTIC_WAYS 2
 
/* Number of usage states (2, 3, 4 etc.). */
#define BTIC_USTATES 2
 
/* Target block size in bytes. */
#define BTIC_BLOCKSIZE 4
 
struct btic_entry {
struct {
oraddr_t addr; /* cached target address of a branch */
int lru; /* least recently used */
char *insn; /* cached insn at target address (not used currently) */
} way[BTIC_WAYS];
} btic[BTIC_LEN];
 
void btic_info()
{
if (!config.bpb.btic) {
PRINTF("BTIC not simulated. Check --btic option.\n");
return;
}
 
PRINTF("BTIC %d bytes: ", BTIC_LEN * BTIC_WAYS * (BTIC_USTATES + BTIC_BLOCKSIZE * 8) / 8);
PRINTF("%d ways, %d sets, %d bits/target\n", BTIC_WAYS, BTIC_LEN, BTIC_USTATES + BTIC_BLOCKSIZE * 8);
}
 
/* First check if target addr is already in the cache and if it is:
- increment BTIC hit stats,
- set 'lru' at this way to BTIC_USTATES - 1 and
decrement 'lru' of other ways unless they have reached 0,
and if not:
- increment BTIC miss stats
- find lru way and entry and replace old address with 'addr' and
'insn' with NULL
- set 'lru' with BTIC_USTATES - 1 and decrement 'lru' of other
ways unless they have reached 0
*/
 
void btic_update(oraddr_t targetaddr)
{
int entry, way = -1;
int i;
/* BTIC simulation enabled/disabled. */
if (!config.bpb.btic)
return;
 
/* Calc entry. */
entry = targetaddr % BTIC_LEN;
/* Scan all ways and try to find our addr. */
for (i = 0; i < BTIC_WAYS; i++)
if (btic[entry].way[i].addr == targetaddr)
way = i;
/* Did we find our cached branch? */
if (way >= 0) { /* Yes, we did. */
or1k_mstats.btic.hit++;
for (i = 0; i < BTIC_WAYS; i++)
if (btic[entry].way[i].lru)
btic[entry].way[i].lru--;
btic[entry].way[way].lru = BTIC_USTATES - 1;
}
else { /* No, we didn't. */
int minlru = BTIC_USTATES - 1;
int minway = 0;
or1k_mstats.btic.miss++;
for (i = 0; i < BTIC_WAYS; i++)
if (btic[entry].way[i].lru < minlru)
minway = i;
btic[entry].way[minway].addr = targetaddr;
btic[entry].way[minway].insn = NULL;
for (i = 0; i < BTIC_WAYS; i++)
if (btic[entry].way[i].lru)
btic[entry].way[i].lru--;
btic[entry].way[minway].lru = BTIC_USTATES - 1;
}
}
 
/*----------------------------------------------------[ BPB configuration ]---*/
void bpb_enabled(union param_val val, void *dat)
{
config.bpb.enabled = val.int_val;
}
 
void bpb_btic(union param_val val, void *dat)
{
config.bpb.btic = val.int_val;
}
 
void bpb_sbp_bnf_fwd(union param_val val, void *dat)
{
config.bpb.sbp_bnf_fwd = val.int_val;
}
 
void bpb_sbp_bf_fwd(union param_val val, void *dat)
{
config.bpb.sbp_bf_fwd = val.int_val;
}
 
void bpb_missdelay(union param_val val, void *dat)
{
config.bpb.missdelay = val.int_val;
}
 
void bpb_hitdelay(union param_val val, void *dat)
{
config.bpb.hitdelay = val.int_val;
}
 
void reg_bpb_sec(void)
{
struct config_section *sec = reg_config_sec("bpb", NULL, NULL);
 
reg_config_param(sec, "enabled", paramt_int, bpb_enabled);
reg_config_param(sec, "btic", paramt_int, bpb_btic);
reg_config_param(sec, "sbp_bnf_fwd", paramt_int, bpb_sbp_bnf_fwd);
reg_config_param(sec, "sbp_bf_fwd", paramt_int, bpb_sbp_bf_fwd);
reg_config_param(sec, "missdelay", paramt_int, bpb_missdelay);
reg_config_param(sec, "hitdelay", paramt_int, bpb_hitdelay);
}
/branch_predict.h
0,0 → 1,25
/* branch_predict.h -- branch prediction header file
Copyright (C) 1999 Damjan Lampret, lampret@opencores.org
This file is part of OpenRISC 1000 Architectural Simulator.
This program 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 2 of the License, or
(at your option) any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
 
/* more or less useless at the moment */
void bpb_update(oraddr_t addr, int taken);
void btic_update(oraddr_t targetaddr);
void bpb_info();
void btic_info();
/Makefile.am
0,0 → 1,23
# Makefile -- Makefile for cpu architecture independent simulation
# Copyright (C) 1999 Damjan Lampret, lampret@opencores.org
#
# This file is part of OpenRISC 1000 Architectural Simulator.
#
# This program 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 2 of the License, or
# (at your option) any later version.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
 
noinst_LIBRARIES = libbpb.a
libbpb_a_SOURCES = branch_predict.c
 
/.
. Property changes : Added: svn:ignore ## -0,0 +1,2 ## +Makefile +.deps

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