shootout: move test/bench/shootout from Go distribution here
README is new; everything else is a verbatim copy.
For golang/go#13584.
Change-Id: I425b5f3aab235e4165cec0711a5029edcd1a56c3
Reviewed-on: https://go-review.googlesource.com/18319
Reviewed-by: Ian Lance Taylor <iant@golang.org>
diff --git a/shootout/reverse-complement.go b/shootout/reverse-complement.go
new file mode 100644
index 0000000..baa30ff
--- /dev/null
+++ b/shootout/reverse-complement.go
@@ -0,0 +1,105 @@
+/*
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+ * Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+
+ * Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
+
+ * Neither the name of "The Computer Language Benchmarks Game" nor the
+ name of "The Computer Language Shootout Benchmarks" nor the names of
+ its contributors may be used to endorse or promote products derived
+ from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+*/
+
+/* The Computer Language Benchmarks Game
+ * http://shootout.alioth.debian.org/
+ *
+ * contributed by The Go Authors.
+ */
+
+package main
+
+import (
+ "bufio"
+ "os"
+)
+
+const lineSize = 60
+
+var complement = [256]uint8{
+ 'A': 'T', 'a': 'T',
+ 'C': 'G', 'c': 'G',
+ 'G': 'C', 'g': 'C',
+ 'T': 'A', 't': 'A',
+ 'U': 'A', 'u': 'A',
+ 'M': 'K', 'm': 'K',
+ 'R': 'Y', 'r': 'Y',
+ 'W': 'W', 'w': 'W',
+ 'S': 'S', 's': 'S',
+ 'Y': 'R', 'y': 'R',
+ 'K': 'M', 'k': 'M',
+ 'V': 'B', 'v': 'B',
+ 'H': 'D', 'h': 'D',
+ 'D': 'H', 'd': 'H',
+ 'B': 'V', 'b': 'V',
+ 'N': 'N', 'n': 'N',
+}
+
+func main() {
+ in := bufio.NewReader(os.Stdin)
+ buf := make([]byte, 1024*1024)
+ line, err := in.ReadSlice('\n')
+ for err == nil {
+ os.Stdout.Write(line)
+
+ // Accumulate reversed complement in buf[w:]
+ nchar := 0
+ w := len(buf)
+ for {
+ line, err = in.ReadSlice('\n')
+ if err != nil || line[0] == '>' {
+ break
+ }
+ line = line[0 : len(line)-1]
+ nchar += len(line)
+ if len(line)+nchar/60+128 >= w {
+ nbuf := make([]byte, len(buf)*5)
+ copy(nbuf[len(nbuf)-len(buf):], buf)
+ w += len(nbuf) - len(buf)
+ buf = nbuf
+ }
+
+ // This loop is the bottleneck.
+ for _, c := range line {
+ w--
+ buf[w] = complement[c]
+ }
+ }
+
+ // Copy down to beginning of buffer, inserting newlines.
+ // The loop left room for the newlines and 128 bytes of padding.
+ i := 0
+ for j := w; j < len(buf); j += 60 {
+ n := copy(buf[i:i+60], buf[j:])
+ buf[i+n] = '\n'
+ i += n + 1
+ }
+ os.Stdout.Write(buf[0:i])
+ }
+}
