Added a test for CLZ

test/cctest/compiler/test-run-machops.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <cmath>
 #include <functional>
 #include <limits>
 
 #include "src/base/bits.h"
 #include "src/base/utils/random-number-generator.h"
@@ skipping 57 matching lines @@
   TestWord32Ctz(0x27a9db40, 6);
   TestWord32Ctz(0xde3bcb20, 5);
   TestWord32Ctz(0xd7e8a610, 4);
   TestWord32Ctz(0x9afdbc88, 3);
   TestWord32Ctz(0x9afdbc84, 2);
   TestWord32Ctz(0x9afdbc82, 1);
   TestWord32Ctz(0x9afdbc81, 0);
 }
 
 
+void TestWord32Clz(int32_t value, int32_t expected) {
+  RawMachineAssemblerTester<int32_t> m;
+  Node* clz = m.Word32Clz(m.Int32Constant(value));
+  m.Return(clz);
+  CHECK_EQ(expected, m.Call());
+}
+
+
+TEST(RunInt32Clz) {
+  TestWord32Clz(0x80001000, 0);
+  TestWord32Clz(0x40000500, 1);
+  TestWord32Clz(0x20000300, 2);
+  TestWord32Clz(0x10000003, 3);
+  TestWord32Clz(0x08050000, 4);
+  TestWord32Clz(0x04006000, 5);
+  TestWord32Clz(0x02000000, 6);
+  TestWord32Clz(0x010000a0, 7);
+  TestWord32Clz(0x00800c00, 8);
+  TestWord32Clz(0x00400000, 9);
+  TestWord32Clz(0x0020000d, 10);
+  TestWord32Clz(0x00100f00, 11);
+  TestWord32Clz(0x00080000, 12);
+  TestWord32Clz(0x00041000, 13);
+  TestWord32Clz(0x00020020, 14);
+  TestWord32Clz(0x00010300, 15);
+  TestWord32Clz(0x00008040, 16);
+  TestWord32Clz(0x00004005, 17);
+  TestWord32Clz(0x00002050, 18);
+  TestWord32Clz(0x00001700, 19);
+  TestWord32Clz(0x00000870, 20);
+  TestWord32Clz(0x00000405, 21);
+  TestWord32Clz(0x00000203, 22);
+  TestWord32Clz(0x00000101, 23);
+  TestWord32Clz(0x00000089, 24);
+  TestWord32Clz(0x00000041, 25);
+  TestWord32Clz(0x00000022, 26);
+  TestWord32Clz(0x00000013, 27);
+  TestWord32Clz(0x00000008, 28);
+  TestWord32Clz(0x00000004, 29);
+  TestWord32Clz(0x00000002, 30);
+  TestWord32Clz(0x00000001, 31);
+  TestWord32Clz(0x00000000, 32);
+}
+
+
 static Node* Int32Input(RawMachineAssemblerTester<int32_t>* m, int index) {
   switch (index) {
     case 0:
       return m->Parameter(0);
     case 1:
       return m->Parameter(1);
     case 2:
       return m->Int32Constant(0);
     case 3:
       return m->Int32Constant(1);
@@ skipping 5389 matching lines @@
       c->CalleeSavedRegisters(),                         // callee saved
       c->CalleeSavedFPRegisters(),                       // callee saved FP
       CallDescriptor::kNoFlags,                          // flags
       "c-call-as-code");
   Node* call = r.AddNode(r.common()->Call(desc), phi);
   r.Return(call);
 
   CHECK_EQ(33, r.Call(1));
   CHECK_EQ(44, r.Call(0));
 }