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authorSiddhesh Poyarekar <siddhesh@redhat.com>2013-04-30 14:17:57 +0530
committerSiddhesh Poyarekar <siddhesh@redhat.com>2013-04-30 14:17:57 +0530
commitf0ee064b7dcdbde6b28002a63be4b86c86e235b9 (patch)
tree9f8bf86a28d538c1158913afc8f734eb6339b44e /scripts
parentd569c6eeb48219993063f956e516704281602f7d (diff)
downloadglibc-f0ee064b7dcdbde6b28002a63be4b86c86e235b9.tar.gz
Allow multiple input domains to be run in the same benchmark program
Some math functions have distinct performance characteristics in specific domains of inputs, where some inputs return via a fast path while other inputs require multiple precision calculations, that too at different precision levels. The way to implement different domains was to have a separate source file and benchmark definition, resulting in separate programs. This clutters up the benchmark, so this change allows these domains to be consolidated into the same input file. To do this, the input file format is now enhanced to allow comments with a preceding # and directives with two # at the begining of a line. A directive that looks like: tells the benchmark generation script that what follows is a different domain of inputs. The value of the 'name' directive (in this case, foo) is used in the output. The two input domains are then executed sequentially and their results collated separately. with the above directive, there would be two lines in the result that look like: func(): .... func(foo): ...
Diffstat (limited to 'scripts')
-rwxr-xr-xscripts/bench.pl105
1 files changed, 91 insertions, 14 deletions
diff --git a/scripts/bench.pl b/scripts/bench.pl
index 5856cfa397..dcc5ead727 100755
--- a/scripts/bench.pl
+++ b/scripts/bench.pl
@@ -42,15 +42,28 @@ if (@ARGV == 3) {
my $decl = "extern $ret $func (";
+# Function has no arguments.
if (@args == 0 || $args[0] eq "void") {
print "$decl void);\n";
- print "#define CALL_BENCH_FUNC(j) $func();\n";
- print "#define NUM_SAMPLES (1)\n";
+ print "#define CALL_BENCH_FUNC(i,j) $func();\n";
+ print "#define NUM_VARIANTS (1)\n";
+ print "#define NUM_SAMPLES(v) (1)\n";
+ print "#define VARIANT(v) FUNCNAME \"()\"\n"
}
+# The function has arguments, so parse them and populate the inputs.
else {
my $num = 0;
- my $bench_func = "#define CALL_BENCH_FUNC(j) $func (";
- my $struct = "struct args {";
+ my $bench_func = "#define CALL_BENCH_FUNC(v, i) $func (";
+
+ my $struct =
+ "struct _variants
+ {
+ const char *name;
+ int count;
+ struct args *in;
+ };\n";
+
+ my $arg_struct = "struct args {";
foreach $arg (@args) {
if ($num > 0) {
@@ -58,24 +71,87 @@ else {
$decl = "$decl,";
}
- $struct = "$struct $arg arg$num;";
- $bench_func = "$bench_func in[j].arg$num";
+ $arg_struct = "$arg_struct $arg arg$num;";
+ $bench_func = "$bench_func variants[v].in[i].arg$num";
$decl = "$decl $arg";
$num = $num + 1;
}
- print "$decl);\n";
- print "$bench_func);\n";
- print "$struct } in[] = {";
+ $arg_struct = $arg_struct . "};\n";
+ $decl = $decl . ");\n";
+ $bench_func = $bench_func . ");\n";
+
+ # We create a hash of inputs for each variant of the test.
+ my $variant = "";
+ my @curvals;
+ my %vals;
open INPUTS, "<$func-inputs" or die $!;
- while (<INPUTS>) {
+ LINE:while (<INPUTS>) {
chomp;
- print "{$_},\n";
+
+ # New variant.
+ if (/^## (\w+): (\w+)/) {
+ #We only identify Name for now.
+ if ($1 ne "name") {
+ next LINE;
+ }
+
+ # Save values in the last variant.
+ my @copy = @curvals;
+ $vals{$variant} = \@copy;
+
+ # Prepare for the next.
+ $variant=$2;
+ undef @curvals;
+ next LINE;
+ }
+
+ # Skip over comments.
+ if (/^#/) {
+ next LINE;
+ }
+ push (@curvals, $_);
}
- print "};\n";
- print "#define NUM_SAMPLES (sizeof (in) / sizeof (struct args))\n"
+
+ $vals{$variant} = \@curvals;
+
+ # Print the definitions and macros.
+ print $decl;
+ 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 $c\n";
+ print "#define NUM_SAMPLES(i) (variants[i].count)\n";
+ print "#define VARIANT(i) (variants[i].name)\n";
}
# In some cases not storing a return value seems to result in the function call
@@ -85,7 +161,8 @@ if ($ret ne "void") {
$getret = "ret = ";
}
-print "#define BENCH_FUNC(j) ({$getret CALL_BENCH_FUNC (j);})\n";
+# 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";