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#!/usr/bin/env perl
##
## Copyright (c) 2017, Alliance for Open Media. All rights reserved
##
## This source code is subject to the terms of the BSD 2 Clause License and
## the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
## was not distributed with this source code in the LICENSE file, you can
## obtain it at www.aomedia.org/license/software. If the Alliance for Open
## Media Patent License 1.0 was not distributed with this source code in the
## PATENTS file, you can obtain it at www.aomedia.org/license/patent.
##
no strict 'refs';
use warnings;
use Getopt::Long;
Getopt::Long::Configure("auto_help") if $Getopt::Long::VERSION > 2.32;
my %ALL_FUNCS = ();
my @ALL_ARCHS;
my @ALL_FORWARD_DECLS;
my @REQUIRES;
my %opts = ();
my %disabled = ();
my %required = ();
my @argv;
foreach (@ARGV) {
$disabled{$1} = 1, next if /--disable-(.*)/;
$required{$1} = 1, next if /--require-(.*)/;
push @argv, $_;
}
# NB: use GetOptions() instead of GetOptionsFromArray() for compatibility.
@ARGV = @argv;
GetOptions(
\%opts,
'arch=s',
'sym=s',
'config=s',
);
foreach my $opt (qw/arch config/) {
if (!defined($opts{$opt})) {
warn "--$opt is required!\n";
Getopt::Long::HelpMessage('-exit' => 1);
}
}
foreach my $defs_file (@ARGV) {
if (!-f $defs_file) {
warn "$defs_file: $!\n";
Getopt::Long::HelpMessage('-exit' => 1);
}
}
open CONFIG_FILE, $opts{config} or
die "Error opening config file '$opts{config}': $!\n";
my %config = ();
while (<CONFIG_FILE>) {
next if !/^#define\s+(?:CONFIG_|HAVE_)/;
chomp;
my @line_components = split /\s/;
scalar @line_components > 2 or
die "Invalid input passed to rtcd.pl via $opts{config}.";
# $line_components[0] = #define
# $line_components[1] = flag name (CONFIG_SOMETHING or HAVE_SOMETHING)
# $line_components[2] = flag value (0 or 1)
$config{$line_components[1]} = "$line_components[2]" eq "1" ? "yes" : "";
}
close CONFIG_FILE;
#
# Routines for the RTCD DSL to call
#
sub aom_config($) {
return (defined $config{$_[0]}) ? $config{$_[0]} : "";
}
sub specialize {
if (@_ <= 1) {
die "'specialize' must be called with a function name and at least one ",
"architecture ('C' is implied): \n@_\n";
}
my $fn=$_[0];
shift;
foreach my $opt (@_) {
eval "\$${fn}_${opt}=${fn}_${opt}";
}
}
sub add_proto {
my $fn = splice(@_, -2, 1);
my @proto = @_;
foreach (@proto) { tr/\t/ / }
$ALL_FUNCS{$fn} = \@proto;
specialize $fn, "c";
}
sub require {
foreach my $fn (keys %ALL_FUNCS) {
foreach my $opt (@_) {
my $ofn = eval "\$${fn}_${opt}";
next if !$ofn;
# if we already have a default, then we can disable it, as we know
# we can do better.
my $best = eval "\$${fn}_default";
if ($best) {
my $best_ofn = eval "\$${best}";
if ($best_ofn && "$best_ofn" ne "$ofn") {
eval "\$${best}_link = 'false'";
}
}
eval "\$${fn}_default=${fn}_${opt}";
eval "\$${fn}_${opt}_link='true'";
}
}
}
sub forward_decls {
push @ALL_FORWARD_DECLS, @_;
}
#
# Include the user's directives
#
foreach my $f (@ARGV) {
open FILE, "<", $f or die "cannot open $f: $!\n";
my $contents = join('', <FILE>);
close FILE;
eval $contents or warn "eval failed: $@\n";
}
#
# Process the directives according to the command line
#
sub process_forward_decls() {
foreach (@ALL_FORWARD_DECLS) {
$_->();
}
}
sub determine_indirection {
aom_config("CONFIG_RUNTIME_CPU_DETECT") eq "yes" or &require(@ALL_ARCHS);
foreach my $fn (keys %ALL_FUNCS) {
my $n = "";
my @val = @{$ALL_FUNCS{$fn}};
my $args = pop @val;
my $rtyp = "@val";
my $dfn = eval "\$${fn}_default";
$dfn = eval "\$${dfn}";
foreach my $opt (@_) {
my $ofn = eval "\$${fn}_${opt}";
next if !$ofn;
my $link = eval "\$${fn}_${opt}_link";
next if $link && $link eq "false";
$n .= "x";
}
if ($n eq "x") {
eval "\$${fn}_indirect = 'false'";
} else {
eval "\$${fn}_indirect = 'true'";
}
}
}
sub declare_function_pointers {
foreach my $fn (sort keys %ALL_FUNCS) {
my @val = @{$ALL_FUNCS{$fn}};
my $args = pop @val;
my $rtyp = "@val";
my $dfn = eval "\$${fn}_default";
$dfn = eval "\$${dfn}";
foreach my $opt (@_) {
my $ofn = eval "\$${fn}_${opt}";
next if !$ofn;
print "$rtyp ${ofn}($args);\n";
}
if (eval "\$${fn}_indirect" eq "false") {
print "#define ${fn} ${dfn}\n";
} else {
print "RTCD_EXTERN $rtyp (*${fn})($args);\n";
}
print "\n";
}
}
sub set_function_pointers {
foreach my $fn (sort keys %ALL_FUNCS) {
my @val = @{$ALL_FUNCS{$fn}};
my $args = pop @val;
my $rtyp = "@val";
my $dfn = eval "\$${fn}_default";
$dfn = eval "\$${dfn}";
if (eval "\$${fn}_indirect" eq "true") {
print " $fn = $dfn;\n";
foreach my $opt (@_) {
my $ofn = eval "\$${fn}_${opt}";
next if !$ofn;
next if "$ofn" eq "$dfn";
my $link = eval "\$${fn}_${opt}_link";
next if $link && $link eq "false";
my $cond = eval "\$have_${opt}";
print " if (${cond}) $fn = $ofn;\n"
}
}
}
}
sub filter {
my @filtered;
foreach (@_) { push @filtered, $_ unless $disabled{$_}; }
return @filtered;
}
#
# Helper functions for generating the arch specific RTCD files
#
sub common_top() {
my $include_guard = uc($opts{sym})."_H_";
print <<EOF;
// This file is generated. Do not edit.
#ifndef ${include_guard}
#define ${include_guard}
#ifdef RTCD_C
#define RTCD_EXTERN
#else
#define RTCD_EXTERN extern
#endif
EOF
process_forward_decls();
print <<EOF;
#ifdef __cplusplus
extern "C" {
#endif
EOF
declare_function_pointers("c", @ALL_ARCHS);
print <<EOF;
void $opts{sym}(void);
EOF
}
sub common_bottom() {
print <<EOF;
#ifdef __cplusplus
} // extern "C"
#endif
#endif
EOF
}
sub x86() {
determine_indirection("c", @ALL_ARCHS);
# Assign the helper variable for each enabled extension
foreach my $opt (@ALL_ARCHS) {
my $opt_uc = uc $opt;
eval "\$have_${opt}=\"flags & HAS_${opt_uc}\"";
}
common_top;
print <<EOF;
#ifdef RTCD_C
#include "aom_ports/x86.h"
static void setup_rtcd_internal(void)
{
int flags = x86_simd_caps();
(void)flags;
EOF
set_function_pointers("c", @ALL_ARCHS);
print <<EOF;
}
#endif
EOF
common_bottom;
}
sub arm() {
determine_indirection("c", @ALL_ARCHS);
# Assign the helper variable for each enabled extension
foreach my $opt (@ALL_ARCHS) {
my $opt_uc = uc $opt;
eval "\$have_${opt}=\"flags & HAS_${opt_uc}\"";
}
common_top;
print <<EOF;
#include "config/aom_config.h"
#ifdef RTCD_C
#include "aom_ports/arm.h"
static void setup_rtcd_internal(void)
{
int flags = aom_arm_cpu_caps();
(void)flags;
EOF
set_function_pointers("c", @ALL_ARCHS);
print <<EOF;
}
#endif
EOF
common_bottom;
}
sub ppc() {
determine_indirection("c", @ALL_ARCHS);
# Assign the helper variable for each enabled extension
foreach my $opt (@ALL_ARCHS) {
my $opt_uc = uc $opt;
eval "\$have_${opt}=\"flags & HAS_${opt_uc}\"";
}
common_top;
print <<EOF;
#include "config/aom_config.h"
#ifdef RTCD_C
#include "aom_ports/ppc.h"
static void setup_rtcd_internal(void)
{
int flags = ppc_simd_caps();
(void)flags;
EOF
set_function_pointers("c", @ALL_ARCHS);
print <<EOF;
}
#endif
EOF
common_bottom;
}
sub unoptimized() {
determine_indirection "c";
common_top;
print <<EOF;
#include "config/aom_config.h"
#ifdef RTCD_C
static void setup_rtcd_internal(void)
{
EOF
set_function_pointers "c";
print <<EOF;
}
#endif
EOF
common_bottom;
}
#
# Main Driver
#
&require("c");
&require(keys %required);
if ($opts{arch} eq 'x86') {
@ALL_ARCHS = filter(qw/mmx sse sse2 sse3 ssse3 sse4_1 sse4_2 avx avx2/);
x86;
} elsif ($opts{arch} eq 'x86_64') {
@ALL_ARCHS = filter(qw/mmx sse sse2 sse3 ssse3 sse4_1 sse4_2 avx avx2/);
@REQUIRES = filter(qw/mmx sse sse2/);
&require(@REQUIRES);
x86;
} elsif ($opts{arch} =~ /armv[78]\w?/) {
@ALL_ARCHS = filter(qw/neon/);
arm;
} elsif ($opts{arch} eq 'arm64' ) {
@ALL_ARCHS = filter(qw/neon arm_crc32 neon_dotprod neon_i8mm sve sve2/);
@REQUIRES = filter(qw/neon/);
&require(@REQUIRES);
arm;
} elsif ($opts{arch} eq 'ppc') {
@ALL_ARCHS = filter(qw/vsx/);
ppc;
} else {
unoptimized;
}
__END__
=head1 NAME
rtcd -
=head1 SYNOPSIS
Usage: rtcd.pl [options] FILE
See 'perldoc rtcd.pl' for more details.
=head1 DESCRIPTION
Reads the Run Time CPU Detections definitions from FILE and generates a
C header file on stdout.
=head1 OPTIONS
Options:
--arch=ARCH Architecture to generate defs for (required)
--disable-EXT Disable support for EXT extensions
--require-EXT Require support for EXT extensions
--sym=SYMBOL Unique symbol to use for RTCD initialization function
--config=FILE Path to file containing C preprocessor directives to parse
|