X87: Added Popcnt as an optional operator and implement it on x64 and ia32.

src/x87/macro-assembler-x87.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.
 
 #if V8_TARGET_ARCH_X87
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 2309 matching lines @@
 void MacroAssembler::Tzcnt(Register dst, const Operand& src) {
   // TODO(intel): Add support for TZCNT (with ABM/BMI1).
   Label not_zero_src;
   bsf(dst, src);
   j(not_zero, &not_zero_src, Label::kNear);
   Move(dst, Immediate(32));  // The result of tzcnt is 32 if src = 0.
   bind(&not_zero_src);
 }
 
 
+void MacroAssembler::Popcnt(Register dst, const Operand& src) {
+  // TODO(intel): Add support for POPCNT (with POPCNT)
+  // if (CpuFeatures::IsSupported(POPCNT)) {
+  //   CpuFeatureScope scope(this, POPCNT);
+  //   popcnt(dst, src);
+  //   return;
+  // }
+  UNREACHABLE();
+}
+
+
 void MacroAssembler::SetCounter(StatsCounter* counter, int value) {
   if (FLAG_native_code_counters && counter->Enabled()) {
     mov(Operand::StaticVariable(ExternalReference(counter)), Immediate(value));
   }
 }
 
 
 void MacroAssembler::IncrementCounter(StatsCounter* counter, int value) {
   DCHECK(value > 0);
   if (FLAG_native_code_counters && counter->Enabled()) {
@@ skipping 671 matching lines @@
   mov(eax, dividend);
   shr(eax, 31);
   add(edx, eax);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X87