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48a18de1e1
Resolves: #15424 The compiler would optimize the benchmark function call out of the loop and call it only once, resulting in blazingly fast times for some benchmarks (notably atan, sin and cos). Mark the inputs as volatile so that the code is forced to read again from the input for each iteration.
169 lines
3.9 KiB
Perl
Executable File
169 lines
3.9 KiB
Perl
Executable File
#! /usr/bin/perl -w
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# Copyright (C) 2013 Free Software Foundation, Inc.
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# This file is part of the GNU C Library.
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# The GNU C Library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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# The GNU C Library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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# You should have received a copy of the GNU Lesser General Public
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# License along with the GNU C Library; if not, see
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# <http://www.gnu.org/licenses/>.
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use strict;
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use warnings;
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# Generate a benchmark source file for a given input.
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if (@ARGV < 2) {
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die "Usage: bench.pl <function> [parameter types] [return type]"
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}
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my $arg;
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my $func = $ARGV[0];
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my @args;
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my $ret = "void";
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my $getret = "";
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my $retval = "";
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if (@ARGV >= 2) {
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@args = split(':', $ARGV[1]);
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}
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if (@ARGV == 3) {
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$ret = $ARGV[2];
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}
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my $decl = "extern $ret $func (";
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# Function has no arguments.
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if (@args == 0 || $args[0] eq "void") {
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print "$decl void);\n";
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print "#define CALL_BENCH_FUNC(i,j) $func();\n";
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print "#define NUM_VARIANTS (1)\n";
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print "#define NUM_SAMPLES(v) (1)\n";
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print "#define VARIANT(v) FUNCNAME \"()\"\n"
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}
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# The function has arguments, so parse them and populate the inputs.
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else {
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my $num = 0;
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my $bench_func = "#define CALL_BENCH_FUNC(v, i) $func (";
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my $struct =
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"struct _variants
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{
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const char *name;
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int count;
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struct args *in;
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};\n";
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my $arg_struct = "struct args {";
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foreach $arg (@args) {
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if ($num > 0) {
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$bench_func = "$bench_func,";
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$decl = "$decl,";
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}
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$arg_struct = "$arg_struct volatile $arg arg$num;";
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$bench_func = "$bench_func variants[v].in[i].arg$num";
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$decl = "$decl $arg";
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$num = $num + 1;
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}
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$arg_struct = $arg_struct . "};\n";
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$decl = $decl . ");\n";
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$bench_func = $bench_func . ");\n";
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# We create a hash of inputs for each variant of the test.
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my $variant = "";
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my @curvals;
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my %vals;
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open INPUTS, "<$func-inputs" or die $!;
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LINE:while (<INPUTS>) {
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chomp;
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# New variant.
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if (/^## (\w+): (\w+)/) {
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#We only identify Name for now.
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if ($1 ne "name") {
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next LINE;
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}
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# Save values in the last variant.
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my @copy = @curvals;
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$vals{$variant} = \@copy;
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# Prepare for the next.
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$variant=$2;
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undef @curvals;
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next LINE;
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}
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# Skip over comments.
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if (/^#/) {
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next LINE;
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}
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push (@curvals, $_);
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}
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$vals{$variant} = \@curvals;
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# Print the definitions and macros.
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print $decl;
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print $bench_func;
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print $arg_struct;
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print $struct;
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my $c = 0;
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my $key;
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# Print the input arrays.
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foreach $key (keys %vals) {
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my @arr = @{$vals{$key}};
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print "struct args in" . $c . "[" . @arr . "] = {\n";
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foreach (@arr) {
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print "{$_},\n";
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}
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print "};\n\n";
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$c += 1;
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}
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# The variants. Each variant then points to the appropriate input array we
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# defined above.
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print "struct _variants variants[" . (keys %vals) . "] = {\n";
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$c = 0;
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foreach $key (keys %vals) {
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print "{\"$func($key)\", " . @{$vals{$key}} . ", in$c},\n";
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$c += 1;
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}
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print "};\n\n";
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# Finally, print the last set of macros.
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print "#define NUM_VARIANTS $c\n";
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print "#define NUM_SAMPLES(i) (variants[i].count)\n";
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print "#define VARIANT(i) (variants[i].name)\n";
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}
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# In some cases not storing a return value seems to result in the function call
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# being optimized out.
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if ($ret ne "void") {
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print "static volatile $ret ret = 0.0;\n";
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$getret = "ret = ";
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}
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# And we're done.
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print "#define BENCH_FUNC(i, j) ({$getret CALL_BENCH_FUNC (i, j);})\n";
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print "#define FUNCNAME \"$func\"\n";
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print "#include \"bench-skeleton.c\"\n";
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