A type vector with multiple IC types needs metadata.

test/cctest/test-utils.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // 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
@@ skipping 58 matching lines @@
   CHECK_EQ(0, FastD2IChecked(0.345));
   CHECK_EQ(1, FastD2IChecked(1.234));
   CHECK_EQ(1000000, FastD2IChecked(1000000.123));
 
   CHECK_EQ(INT_MAX, FastD2IChecked(1.0e100));
   CHECK_EQ(INT_MIN, FastD2IChecked(-1.0e100));
   CHECK_EQ(INT_MIN, FastD2IChecked(v8::base::OS::nan_value()));
 }
 
 
+TEST(BitSetComputer) {
+  typedef BitSetComputer<bool, 1, kSmiValueSize, uint32_t> BoolComputer;
+  CHECK_EQ(0, BoolComputer::word_count(0));
+  CHECK_EQ(1, BoolComputer::word_count(8));
+  CHECK_EQ(2, BoolComputer::word_count(50));
+  CHECK_EQ(0, BoolComputer::index(0, 8));
+  CHECK_EQ(100, BoolComputer::index(100, 8));
+  CHECK_EQ(1, BoolComputer::index(0, 40));
+  uint32_t data = 0;
+  data = BoolComputer::encode(data, 1, true);
+  data = BoolComputer::encode(data, 4, true);
+  CHECK_EQ(true, BoolComputer::decode(data, 1));
+  CHECK_EQ(true, BoolComputer::decode(data, 4));
+  CHECK_EQ(false, BoolComputer::decode(data, 0));
+  CHECK_EQ(false, BoolComputer::decode(data, 2));
+  CHECK_EQ(false, BoolComputer::decode(data, 3));
+
+  // Lets store 2 bits per item with 3000 items and verify the values are
+  // correct.
+  typedef BitSetComputer<unsigned char, 2, 8, unsigned char> TwoBits;
+  const int words = 750;
+  CHECK_EQ(words, TwoBits::word_count(3000));
+  const int offset = 10;
+  Vector<unsigned char> buffer = Vector<unsigned char>::New(offset + words);
+  memset(buffer.start(), 0, sizeof(unsigned char) * buffer.length());
+  for (int i = 0; i < words; i++) {
+    const int index = TwoBits::index(offset, i);
+    unsigned char data = buffer[index];
+    data = TwoBits::encode(data, i, i % 4);
+    buffer[index] = data;
+  }
+
+  for (int i = 0; i < words; i++) {
+    const int index = TwoBits::index(offset, i);
+    unsigned char data = buffer[index];
+    CHECK_EQ(i % 4, TwoBits::decode(data, i));
+  }
+}
+
+
 TEST(SNPrintF) {
   // Make sure that strings that are truncated because of too small
   // buffers are zero-terminated anyway.
   const char* s = "the quick lazy .... oh forget it!";
   int length = StrLength(s);
   for (int i = 1; i < length * 2; i++) {
     static const char kMarker = static_cast<char>(42);
     Vector<char> buffer = Vector<char>::New(i + 1);
     buffer[i] = kMarker;
     int n = SNPrintF(Vector<char>(buffer.start(), i), "%s", s);
@@ skipping 158 matching lines @@
   vec.push_back(66);
   for (auto& i : vec) {
     ++i;
   }
   int j = 12;
   for (auto i : vec) {
     CHECK_EQ(j, i);
     j += 11;
   }
 }