First step to cleanup the power-of-2 mess.

src/ia32/lithium-codegen-ia32.cc

 // Copyright 2012 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 "src/v8.h"
 
 #if V8_TARGET_ARCH_IA32
 
+#include "src/base/bits.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
 #include "src/deoptimizer.h"
 #include "src/hydrogen-osr.h"
 #include "src/ia32/lithium-codegen-ia32.h"
 
 namespace v8 {
 namespace internal {
 
 // When invoking builtins, we need to record the safepoint in the middle of
@@ skipping 1192 matching lines @@
   }
   __ idiv(right_reg);
   __ bind(&done);
 }
 
 
 void LCodeGen::DoDivByPowerOf2I(LDivByPowerOf2I* instr) {
   Register dividend = ToRegister(instr->dividend());
   int32_t divisor = instr->divisor();
   Register result = ToRegister(instr->result());
-  DCHECK(divisor == kMinInt || IsPowerOf2(Abs(divisor)));
+  DCHECK(divisor == kMinInt || base::bits::IsPowerOfTwo32(Abs(divisor)));
   DCHECK(!result.is(dividend));
 
   // Check for (0 / -x) that will produce negative zero.
   HDiv* hdiv = instr->hydrogen();
   if (hdiv->CheckFlag(HValue::kBailoutOnMinusZero) && divisor < 0) {
     __ test(dividend, dividend);
     DeoptimizeIf(zero, instr->environment());
   }
   // Check for (kMinInt / -1).
   if (hdiv->CheckFlag(HValue::kCanOverflow) && divisor == -1) {
@@ skipping 3664 matching lines @@
         __ cmpb(FieldOperand(temp, Map::kInstanceTypeOffset),
                 static_cast<int8_t>(last));
         DeoptimizeIf(above, instr->environment());
       }
     }
   } else {
     uint8_t mask;
     uint8_t tag;
     instr->hydrogen()->GetCheckMaskAndTag(&mask, &tag);
 
-    if (IsPowerOf2(mask)) {
-      DCHECK(tag == 0 || IsPowerOf2(tag));
+    if (base::bits::IsPowerOfTwo32(mask)) {
+      DCHECK(tag == 0 || base::bits::IsPowerOfTwo32(tag));
       __ test_b(FieldOperand(temp, Map::kInstanceTypeOffset), mask);
       DeoptimizeIf(tag == 0 ? not_zero : zero, instr->environment());
     } else {
       __ movzx_b(temp, FieldOperand(temp, Map::kInstanceTypeOffset));
       __ and_(temp, mask);
       __ cmp(temp, tag);
       DeoptimizeIf(not_equal, instr->environment());
     }
   }
 }
@@ skipping 751 matching lines @@
   CallRuntime(Runtime::kPushBlockContext, 2, instr);
   RecordSafepoint(Safepoint::kNoLazyDeopt);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32