Adds benchmark support to gotest.

No benchmarks are run unless the --benchmarks=<regexp> flag
is specified on the gotest command line.  This change includes
sample benchmarks for regexp.

% gotest --benchmarks=.*
(standard test output redacted)
testing.BenchmarkSimpleMatch	200000	      7799 ns/op
testing.BenchmarkUngroupedMatch	20000	     76898 ns/op
testing.BenchmarkGroupedMatch	50000	     38148 ns/op

R=r, rsc
http://codereview.appspot.com/154173

Committer: Russ Cox <rsc@golang.org>

1 files changed, 30 insertions, 0 deletions

diff --git a/src/pkg/testing/regexp_test.go b/src/pkg/testing/regexp_test.go
index 8f6b20c67..66139ea1e 100644
--- a/src/pkg/testing/regexp_test.go
+++ b/src/pkg/testing/regexp_test.go
@@ -279,3 +279,33 @@ func TestMatchFunction(t *T) {
 		matchFunctionTest(t, test.re, test.text, test.match);
 	}
 }
+
+func BenchmarkSimpleMatch(b *B) {
+	b.StopTimer();
+	re, _ := CompileRegexp("a");
+	b.StartTimer();
+
+	for i := 0; i < b.N; i++ {
+		re.MatchString("a")
+	}
+}
+
+func BenchmarkUngroupedMatch(b *B) {
+	b.StopTimer();
+	re, _ := CompileRegexp("[a-z]+ [0-9]+ [a-z]+");
+	b.StartTimer();
+
+	for i := 0; i < b.N; i++ {
+		re.MatchString("word 123 other")
+	}
+}
+
+func BenchmarkGroupedMatch(b *B) {
+	b.StopTimer();
+	re, _ := CompileRegexp("([a-z]+) ([0-9]+) ([a-z]+)");
+	b.StartTimer();
+
+	for i := 0; i < b.N; i++ {
+		re.MatchString("word 123 other")
+	}
+}