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#! /usr/bin/perl -w
# Copyright (C) 2013 Free Software Foundation, Inc.
# This file is part of the GNU C Library.
# The GNU C Library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
# The GNU C Library 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
# Lesser General Public License for more details.
# You should have received a copy of the GNU Lesser General Public
# License along with the GNU C Library; if not, see
# <http://www.gnu.org/licenses/>.
use strict;
use warnings;
# Generate a benchmark source file for a given input.
if (@ARGV < 1) {
die "Usage: bench.pl <function>"
}
my $func = $ARGV[0];
my @args;
my $ret = "void";
my $getret = "";
# We create a hash of inputs for each variant of the test.
my $variant = "";
my @curvals;
my %vals;
my @include_headers;
my @include_sources;
my $incl;
open INPUTS, "<$func-inputs" or die $!;
LINE:while (<INPUTS>) {
chomp;
# Directives.
if (/^## ([\w-]+): (.*)/) {
# Function argument types.
if ($1 eq "args") {
@args = split(":", $2);
}
# Function return type.
elsif ($1 eq "ret") {
$ret = $2;
}
elsif ($1 eq "includes") {
@include_headers = split (",", $2);
}
elsif ($1 eq "include-sources") {
@include_sources = split (",", $2);
}
# New variant. This is the only directive allowed in the body of the
# inputs to separate inputs into variants. All others should be at the
# top or else all hell will break loose.
elsif ($1 eq "name") {
# Save values in the previous variant.
my @copy = @curvals;
$vals{$variant} = \@copy;
# Prepare for the next.
$variant=$2;
undef @curvals;
next LINE;
}
else {
die "Unknown directive: ".$1;
}
}
# Skip over comments and blank lines.
if (/^#/ || /^$/) {
next LINE;
}
push (@curvals, $_);
}
my $bench_func = "#define CALL_BENCH_FUNC(v, i) $func (";
# Output variables. These include the return value as well as any pointers
# that may get passed into the function, denoted by the <> around the type.
my $outvars = "";
if ($ret ne "void") {
$outvars = "static $ret volatile ret;\n";
}
# Print the definitions and macros.
foreach $incl (@include_headers) {
print "#include <" . $incl . ">\n";
}
# Print the source files.
foreach $incl (@include_sources) {
print "#include \"" . $incl . "\"\n";
}
if (@args > 0) {
# Save values in the last variant.
$vals{$variant} = \@curvals;
my $struct =
"struct _variants
{
const char *name;
int count;
struct args *in;
};\n";
my $arg_struct = "struct args {";
my $num = 0;
my $arg;
foreach $arg (@args) {
if ($num > 0) {
$bench_func = "$bench_func,";
}
$_ = $arg;
if (/<(.*)\*>/) {
# Output variables. These have to be pointers, so dereference once by
# dropping one *.
$outvars = $outvars . "static $1 out$num;\n";
$bench_func = "$bench_func &out$num";
}
else {
$arg_struct = "$arg_struct $arg volatile arg$num;";
$bench_func = "$bench_func variants[v].in[i].arg$num";
}
$num = $num + 1;
}
$arg_struct = $arg_struct . "};\n";
$bench_func = $bench_func . ");\n";
print $bench_func;
print $arg_struct;
print $struct;
my $c = 0;
my $key;
# Print the input arrays.
foreach $key (keys %vals) {
my @arr = @{$vals{$key}};
print "struct args in" . $c . "[" . @arr . "] = {\n";
foreach (@arr) {
print "{$_},\n";
}
print "};\n\n";
$c += 1;
}
# The variants. Each variant then points to the appropriate input array we
# defined above.
print "struct _variants variants[" . (keys %vals) . "] = {\n";
$c = 0;
foreach $key (keys %vals) {
print "{\"$func($key)\", " . @{$vals{$key}} . ", in$c},\n";
$c += 1;
}
print "};\n\n";
# Finally, print the last set of macros.
print "#define NUM_VARIANTS $c\n";
print "#define NUM_SAMPLES(i) (variants[i].count)\n";
print "#define VARIANT(i) (variants[i].name)\n";
}
else {
print $bench_func . ");\n";
print "#define NUM_VARIANTS (1)\n";
print "#define NUM_SAMPLES(v) (1)\n";
print "#define VARIANT(v) FUNCNAME \"()\"\n"
}
# Print the output variable definitions.
print "$outvars\n";
# In some cases not storing a return value seems to result in the function call
# being optimized out.
if ($ret ne "void") {
$getret = "ret = ";
}
# And we're done.
print "#define BENCH_FUNC(i, j) ({$getret CALL_BENCH_FUNC (i, j);})\n";
print "#define FUNCNAME \"$func\"\n";
print "#include \"bench-skeleton.c\"\n";
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