clean up flattener code and remove unneeded flattener definitions; 3% speedup

src/analyzer.js

@@ -172,9 +172,9 @@ function analyzer(data) {
             return;
           }
           type.flatSize = 0;
-          var sizes = [];
+          var diffs = [];
+          var prev = -1;
           type.flatIndexes = type.fields.map(function(field) {
-            var soFar = type.flatSize;
             var size;
             if (isNumberType(field) || isPointerType(field)) {
               size = getNativeFieldSize(field, true); // pack char; char; in structs, also char[X]s.
@@ -183,14 +183,20 @@ function analyzer(data) {
             } else {
               assert(0);
             }
-            type.flatSize += size;
-            sizes.push(size);
-            return Runtime.alignMemory(soFar, Math.min(QUANTUM_SIZE, size)); // if necessary, place this on aligned memory
+            var curr = Runtime.alignMemory(type.flatSize, Math.min(QUANTUM_SIZE, size)); // if necessary, place this on aligned memory
+            type.flatSize = curr + size;
+            if (prev >= 0) {
+              diffs.push(curr-prev);
+            }
+            prev = curr;
+            return curr;
           });
-          type.flatSize = Runtime.alignMemory(type.flatSize); // padding at end
-          if (dedup(sizes).length == 1) {
-            type.flatFactor = sizes[0];
+          if (diffs.length == 0) {
+            type.flatFactor = type.flatSize;
+          } else if (dedup(diffs).length == 1) {
+            type.flatFactor = diffs[0];
           }
+          type.flatSize = Runtime.alignMemory(type.flatSize); // final padding at end
           type.needsFlattening = (this.flatFactor != 1);
           dprint('types', 'type: ' + type.name_ + ' : ' + JSON.stringify(type.fields));
           dprint('types', '                        has final size of ' + type.flatSize + ', flatting: ' + type.needsFlattening + ' ? ' + (type.flatFactor ? type.flatFactor : JSON.stringify(type.flatIndexes)));

src/jsifier.js

@@ -9,7 +9,7 @@ function JSify(data) {
   substrate.addZyme('Type', {
     processItem: function(item) {
       var type = TYPES[item.name_];
-      if (type.needsFlattening) {
+      if (type.needsFlattening && !type.flatFactor) {
         item.JS = 'var ' + toNiceIdent(item.name_) + '___FLATTENER = ' + JSON.stringify(TYPES[item.name_].flatIndexes) + ';';
       } else {
         item.JS = '// type: ' + item.name_;

tests/runner.py

@@ -881,10 +881,13 @@ else:
   COMPILER = LLVM_GCC
   PARSER_ENGINE = V8_ENGINE
   JS_ENGINE = SPIDERMONKEY_ENGINE
+  if JS_ENGINE == SPIDERMONKEY_ENGINE:
+    JS_ENGINE_OPTS += ['-j', '-m'] # TODO: use this everywhere else
+
   RELOOP = OPTIMIZE = 1
   GUARD_MEMORY = 0
   QUANTUM_SIZE = 1
-  TEST_REPS = 10
+  TEST_REPS = 20
   TOTAL_TESTS = 2
 
   tests_done = 0
@@ -896,7 +899,7 @@ else:
       squared_times = map(lambda x: x*x, times)
       mean_of_squared = sum(squared_times)/len(times)
       std = math.sqrt(mean_of_squared - mean*mean)
-      print '   mean: %.2f (+-%.2f) seconds          (max: %.2f, min: %.2f, noise/signal: %.2f)     (%d runs)' % (mean, std, max(times), min(times), std/mean, TEST_REPS)
+      print '   mean: %.3f (+-%.3f) seconds          (max: %.3f, min: %.3f, noise/signal: %.3f)     (%d runs)' % (mean, std, max(times), min(times), std/mean, TEST_REPS)
 
     def do_benchmark(self, src, args=[], main_file=None):
       print 'Running benchmark:', inspect.stack()[1][3].replace('test_', '')

tests/settings.py

@@ -33,16 +33,10 @@ V8_ENGINE=os.path.expanduser('~/Dev/v8/d8')
 #PARSER_ENGINE=SPIDERMONKEY_ENGINE
 PARSER_ENGINE=V8_ENGINE
 
-#TODO
-#if PARSER_ENGINE == SPIDERMONKEY_ENGINE:
-#  PARSER_ENGINE_OPS += ['-j', '-m']
-
-JS_ENGINE=SPIDERMONKEY_ENGINE
-#JS_ENGINE=V8_ENGINE
+#JS_ENGINE=SPIDERMONKEY_ENGINE
+JS_ENGINE=V8_ENGINE
 
 JS_ENGINE_OPTS=[]
-if JS_ENGINE == SPIDERMONKEY_ENGINE:
-  JS_ENGINE_OPTS += ['-j', '-m']
 
 OUTPUT_TO_SCREEN = 0 # useful for debugging specific tests, or for subjectively seeing what parts are slow