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/* Subroutines for the gcc driver.
Copyright (C) 2015-2017 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 "tm.h"
/* This will be called by the spec parser in gcc.c when it sees
a %:local_cpu_detect(args) construct. Currently it will be called
with either "arch" or "tune" as argument depending on if -march=native
or -mtune=native is to be substituted.
It returns a string containing new command line parameters to be
put at the place of the above two options, depending on what CPU
this is executed. E.g. "-march=zEC12" on a zEC12 for -march=native.
If the routine can't detect a known processor, the -march or -mtune
option is discarded.
ARGC and ARGV are set depending on the actual arguments given
in the spec. */
const char *
s390_host_detect_local_cpu (int argc, const char **argv)
{
const char *cpu = NULL;
char buf[256];
FILE *f;
bool arch;
const char *options = "";
unsigned int has_features;
unsigned int has_processor;
unsigned int is_cpu_z9_109 = 0;
unsigned int has_highgprs = 0;
unsigned int has_dfp = 0;
unsigned int has_te = 0;
unsigned int has_vx = 0;
unsigned int has_opt_esa_zarch = 0;
int i;
if (argc < 1)
return NULL;
arch = strcmp (argv[0], "arch") == 0;
if (!arch && strcmp (argv[0], "tune"))
return NULL;
for (i = 1; i < argc; i++)
if (strcmp (argv[i], "mesa_mzarch") == 0)
has_opt_esa_zarch = 1;
f = fopen ("/proc/cpuinfo", "r");
if (f == NULL)
return NULL;
for (has_features = 0, has_processor = 0;
(has_features == 0 || has_processor == 0)
&& fgets (buf, sizeof (buf), f) != NULL; )
{
if (has_processor == 0 && strncmp (buf, "processor", 9) == 0)
{
const char *p;
long machine_id;
p = strstr (buf, "machine = ");
if (p == NULL)
continue;
p += 10;
has_processor = 1;
machine_id = strtol (p, NULL, 16);
switch (machine_id)
{
/* g5 and g6 default to z900 */
case 0x9672:
case 0x2064:
case 0x2066:
cpu = "z900";
break;
case 0x2084:
case 0x2086:
cpu = "z990";
break;
case 0x2094:
case 0x2096:
cpu = "z9-109";
is_cpu_z9_109 = 1;
break;
case 0x2097:
case 0x2098:
cpu = "z10";
break;
case 0x2817:
case 0x2818:
cpu = "z196";
break;
case 0x2827:
case 0x2828:
cpu = "zEC12";
break;
case 0x2964:
cpu = "z13";
break;
default:
cpu = "arch12";
break;
}
}
if (has_features == 0 && strncmp (buf, "features", 8) == 0)
{
const char *p;
p = strchr (buf, ':');
if (p == NULL)
continue;
p++;
while (*p != 0)
{
int i;
while (ISSPACE (*p))
p++;
for (i = 0; !ISSPACE (p[i]) && p[i] != 0; i++)
;
if (i == 3 && strncmp (p, "dfp", 3) == 0)
has_dfp = 1;
else if (i == 2 && strncmp (p, "te", 2) == 0)
has_te = 1;
else if (i == 2 && strncmp (p, "vx", 2) == 0)
has_vx = 1;
else if (i == 8 && strncmp (p, "highgprs", 8) == 0)
has_highgprs = 1;
p += i;
}
has_features = 1;
}
}
fclose (f);
if (cpu == NULL)
return NULL;
if (arch)
{
const char *opt_htm = "";
const char *opt_vx = "";
const char *opt_esa_zarch = "";
/* We may switch off these cpu features but never switch the on
explicitly. This overrides options specified on the command line. */
if (!has_te)
opt_htm = " -mno-htm";
if (!has_vx)
opt_vx = " -mno-vx";
/* However, we set -mzarch only if neither -mzarch nor -mesa are used on
the command line. This allows the user to switch to -mesa manually.
*/
if (!has_opt_esa_zarch && has_highgprs)
opt_esa_zarch = " -mzarch";
options = concat (options, opt_htm, opt_vx, opt_esa_zarch, NULL);
}
if (has_dfp && is_cpu_z9_109)
cpu = "z9-ec";
return concat ("-m", argv[0], "=", cpu, options, NULL);
}
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