blob: 808eecac2dcd0768126320cc1aebf832e8190254 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
|
#!/usr/bin/perl
#
# GCC optimization flag generator
#
use strict;
use warnings;
my $gcc = $ARGV[0];
my $cpuinfo = $ARGV[1];
if ( ! $gcc ) {
die "Can't generate optimization flags (no compiler specified)\n";
}
if ( ! `which $gcc 2> /dev/null` ) {
die "Can't generate optimization flags ($gcc is missing?)\n";
}
#
# We allow people to provide their own cpuinfo-compatible
# descriptor. This may be useful later if we want to have
# specific architecture-specific optimizations for release
# builds or something.
#
if ( ! $cpuinfo ) {
$cpuinfo = "/proc/cpuinfo";
}
my %features;
my $family;
my $uname_S = `uname -s`;
#
# Collect CPU feature list
#
# The Linux way
if ( -e $cpuinfo ) {
open(FH, "< $cpuinfo");
my @cpuinfo = <FH>;
close FH;
my @familyline = grep(/^cpu family/, @cpuinfo);
$familyline[0] =~ s/^cpu[ ]family[ \t]*[:][ ]*//;
$family = $familyline[0];
my @flags = grep(/^flags/, @cpuinfo);
$flags[0] =~ s/^flags[ \t]*[:][ \t]*//;
@flags = split(' ',$flags[0]);
foreach (@flags) {
$features{$_} = 1;
}
}
# The Mac OS X way
if ( $uname_S =~ /^Darwin/ ) {
# All released Intel macs have CMOV, and
# sysctl doesn't provide this one.
$features{"cmov"} = 1;
$features{"mmx"} = `sysctl -n hw.optional.mmx`;
$features{"sse"} = `sysctl -n hw.optional.sse`;
$features{"sse2"} = `sysctl -n hw.optional.sse2`;
$features{"pni"} = `sysctl -n hw.optional.sse3`;
$features{"ssse3"} = `sysctl -n hw.optional.supplementalsse3`;
}
#
# Check the minimum march/mtune value
#
my $march = "i386";
my $fpmath;
if ( $features{"cmov"} && $features{"mmx"} ) {
$march = "pentium2";
}
if ( $features{"sse"} ) {
$march = "pentium3";
$fpmath = "sse"
}
if ( $features{"sse2"} ) {
$march = "pentium-m";
}
if ( $features{"pni"} ) {
$march = "prescott";
}
# It's important to specify 'march=pentium4' for the
# Pentium 4, because it has vastly different optimization
# rules than other x86 processors. What's optimal for the
# Pentium 3 is extremely sub-optimal for the Pentium 4.
if ( $family == 15 ) {
$march = "pentium4";
}
print "-march=$march -mtune=$march";
if ( $fpmath ) {
print " -mfpmath=$fpmath";
}
print "\n";
exit 0
|
