[COMMITTED] benchtests: New script to parse memcpy results

diff --git a/benchtests/scripts/benchout_strings.schema.json b/benchtests/scripts/benchout_strings.schema.json
new file mode 100644
index 0000000..7c9a671
--- /dev/null
+++ b/benchtests/scripts/benchout_strings.schema.json
@@ -0,0 +1,44 @@ 
+{
+  "title": "string benchmark",
+  "type": "object",
+  "properties": {
+    "timing_type": {
+      "type": "string"
+    },
+    "functions": {
+      "title": "Associative array of functions",
+      "type": "object",
+      "patternProperties": {
+        "^[_a-zA-Z][_a-zA-Z0-9]+$": {
+          "title": "Function names",
+          "type": "object",
+          "properties": {
+            "bench-variant": {"type": "string"},
+	    "ifuncs": {
+              "type": "array",
+	      "items": {"type": "string"}
+	    },
+	    "results": {
+              "type": "array",
+	      "items": {
+                "type": "object",
+		"properties": {
+                  "timings": {
+	            "type": "array",
+		    "items": {"type": "number"}
+                   }
+		 },
+		 "additionalProperties": {"type": "number"},
+		 "minProperties": 2
+	      }
+	    }
+          },
+          "additionalProperties": false
+        }
+      },
+      "minProperties": 1
+    }
+  },
+  "required": ["timing_type", "functions"],
+  "additionalProperties": false
+}
diff --git a/benchtests/scripts/compare_strings.py b/benchtests/scripts/compare_strings.py
new file mode 100755
index 0000000..9d73ec4
--- /dev/null
+++ b/benchtests/scripts/compare_strings.py
@@ -0,0 +1,129 @@ 
+#!/usr/bin/python
+# Copyright (C) 2017 Free Software Foundation, Inc.
+# This file is part of the GNU C Library.
+#
+# The GNU C Library 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 2.1 of the License, or (at your option) any later version.
+#
+# The GNU C Library 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 the GNU C Library; if not, see
+# <http://www.gnu.org/licenses/>.
+"""Compare results of string functions
+
+Given a string benchmark result file, print a table with comparisons with a
+baseline.  The baseline is the first function, which typically is the builtin
+function.
+"""
+import sys
+import os
+import json
+import pylab
+
+try:
+    import jsonschema as validator
+except ImportError:
+    print('Could not find jsonschema module.')
+    raise
+
+
+def parse_file(filename, schema_filename):
+    with open(schema_filename, 'r') as schemafile:
+        schema = json.load(schemafile)
+        with open(filename, 'r') as benchfile:
+            bench = json.load(benchfile)
+            validator.validate(bench, schema)
+            return bench
+
+
+def draw_graph(f, v, ifuncs, results):
+    """Plot graphs for functions
+
+    Plot line graphs for each of the ifuncs
+
+    Args:
+        f: Function name
+        v: Benchmark variant for the function.
+        ifuncs: List of ifunc names
+        results: Dictionary of results for each test criterion
+    """
+    xkeys = results.keys()
+
+    pylab.clf()
+    fig = pylab.figure(frameon=False)
+    fig.set_size_inches(32, 18)
+    pylab.ylabel('Performance improvement from base')
+    X = range(len(xkeys))
+    pylab.xticks(X, xkeys)
+
+    i = 0
+
+    while i < len(ifuncs):
+        Y = [results[k][i] for k in xkeys]
+        lines = pylab.plot(X, Y, label=':'+ifuncs[i])
+        i = i + 1
+
+    pylab.legend()
+    pylab.grid()
+    pylab.savefig('%s-%s.png' % (f, v), bbox_inches='tight')
+
+
+def process_results(results, attrs):
+    """ Process results and print them
+
+    Args:
+        results: JSON dictionary of results
+        attrs: Attributes that form the test criteria
+    """
+
+    for f in results['functions'].keys():
+        print('Function: %s' % f)
+        print('\t'.join(results['functions'][f]['ifuncs']))
+        v = results['functions'][f]['bench-variant']
+        print('Variant: %s' % v)
+        print("=" * 80)
+        graph_res = {}
+        for res in results['functions'][f]['results']:
+            attr_list = ['%s=%s' % (a, res[a]) for a in attrs]
+            first = True
+            key = ','.join(attr_list)
+            sys.stdout.write('%s: \t' % key)
+            graph_res[key] = res['timings']
+            for t in res['timings']:
+                sys.stdout.write ('%.2f' % t)
+                if first:
+                    first = False
+                else:
+                    diff = (res['timings'][0] - t) * 100 / res['timings'][0]
+
+                    sys.stdout.write (' (%.2f%%)' % diff)
+                sys.stdout.write('\t')
+            print('')
+        draw_graph(f, v, results['functions'][f]['ifuncs'], graph_res)
+
+
+def main(args):
+    """Program Entry Point
+
+    Take a string benchmark output file and compare timings.
+    """
+    if len(args) < 3:
+        print('Usage: %s <input file> <schema file> attr1 [attr2 ...]' % sys.argv[0])
+        sys.exit(os.EX_USAGE)
+
+    filename = args[0]
+    schema_filename = args[1]
+    attrs = args[2:]
+
+    results = parse_file(filename, schema_filename)
+    process_results(results, attrs)
+
+
+if __name__ == '__main__':
+    main(sys.argv[1:])