1 /* Subroutines for the gcc driver.
2 Copyright (C) 2008-2020 Free Software Foundation, Inc.
3
4 This file is part of GCC.
5
6 GCC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3, or (at your option)
9 any later version.
10
11 GCC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
19
20 #define IN_TARGET_CODE 1
21
22 #include "config.h"
23 #include "system.h"
24 #include "coretypes.h"
25 #include "tm.h"
26
27 /* This will be called by the spec parser in gcc.c when it sees
28 a %:local_cpu_detect(args) construct. Currently it will be called
29 with either "arch" or "tune" as argument depending on if -march=native
30 or -mtune=native is to be substituted.
31
32 It returns a string containing new command line parameters to be
33 put at the place of the above two options, depending on what CPU
34 this is executed. E.g. "-march=loongson2f" on a Loongson 2F for
35 -march=native. If the routine can't detect a known processor,
36 the -march or -mtune option is discarded.
37
38 ARGC and ARGV are set depending on the actual arguments given
39 in the spec. */
40 const char *
host_detect_local_cpu(int argc,const char ** argv)41 host_detect_local_cpu (int argc, const char **argv)
42 {
43 const char *cpu = NULL;
44 char buf[128];
45 FILE *f;
46 bool arch;
47
48 if (argc < 1)
49 return NULL;
50
51 arch = strcmp (argv[0], "arch") == 0;
52 if (!arch && strcmp (argv[0], "tune"))
53 return NULL;
54
55 f = fopen ("/proc/cpuinfo", "r");
56 if (f == NULL)
57 return NULL;
58
59 while (fgets (buf, sizeof (buf), f) != NULL)
60 if (strncmp (buf, "cpu model", sizeof ("cpu model") - 1) == 0)
61 {
62 if (strstr (buf, "Godson2 V0.2") != NULL
63 || strstr (buf, "Loongson-2 V0.2") != NULL
64 || strstr (buf, "Loongson-2E") != NULL)
65 cpu = "loongson2e";
66 else if (strstr (buf, "Godson2 V0.3") != NULL
67 || strstr (buf, "Loongson-2 V0.3") != NULL
68 || strstr (buf, "Loongson-2F") != NULL)
69 cpu = "loongson2f";
70 else if (strstr (buf, "Godson3 V0.5") != NULL
71 || strstr (buf, "Loongson-3 V0.5") != NULL
72 || strstr (buf, "Loongson-3A") != NULL)
73 cpu = "loongson3a";
74 else if (strstr (buf, "SiByte SB1") != NULL)
75 cpu = "sb1";
76 else if (strstr (buf, "R5000") != NULL)
77 cpu = "r5000";
78 else if (strstr (buf, "Octeon II") != NULL)
79 cpu = "octeon2";
80 else if (strstr (buf, "Octeon") != NULL)
81 cpu = "octeon";
82 break;
83 }
84
85 fclose (f);
86
87 if (cpu == NULL)
88 return NULL;
89
90 return concat ("-m", argv[0], "=", cpu, NULL);
91 }
92