Add 'string-hash' benchmarks.

* benchmark-suite/benchmarks/hash.bm: New file.
* benchmark-suite/Makefile.am (SCM_BENCHMARKS): Add it.

benchmark-suite/Makefile.am

@@ -3,6 +3,7 @@ SCM_BENCHMARKS = benchmarks/0-reference.bm		\
 		 benchmarks/bytevectors.bm		\
 		 benchmarks/chars.bm			\
 		 benchmarks/continuations.bm		\
+		 benchmarks/hash.bm			\
                  benchmarks/if.bm			\
                  benchmarks/logand.bm			\
 		 benchmarks/ports.bm			\

benchmark-suite/benchmarks/hash.bm

@@ -0,0 +1,53 @@
+;;; hash.bm --- Hash functions.                       -*- Scheme -*-
+;;;
+;;; Copyright (C) 2015 Free Software Foundation, Inc.
+;;;
+;;; This program 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 3, or
+;;; (at your option) any later version.
+;;;
+;;; This program 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 this software; see the file COPYING.LESSER.  If
+;;; not, write to the Free Software Foundation, Inc., 51 Franklin
+;;; Street, Fifth Floor, Boston, MA 02110-1301 USA
+
+(define-module (benchmarks write)
+  #:use-module (benchmark-suite lib))
+
+(define %narrow-string
+  (make-string 30 #\a))
+
+(define %wide-string
+  (make-string 30 #\λ))
+
+(define %long-string
+  (make-string 300 #\x))
+
+(define-syntax repeat
+  (lambda (s)
+    (syntax-case s ()
+      ((_ 1 exp)
+       #'exp)
+      ((_ count exp)
+       (with-syntax ((count (- (syntax->datum #'count) 1)))
+         #'(begin
+             exp
+             (repeat count exp)))))))
+
+
+(with-benchmark-prefix "string-hash"
+
+  (benchmark "narrow string" 100000
+    (repeat 100 (string-hash %narrow-string)))
+
+  (benchmark "wide string" 100000
+    (repeat 100 (string-hash %wide-string)))
+
+  (benchmark "long string" 100000
+    (repeat 100 (string-hash %long-string))))