PPC: Implement Popcnt operator.

src/compiler/ppc/instruction-selector-ppc.cc

Index: src/compiler/ppc/instruction-selector-ppc.cc
diff --git a/src/compiler/ppc/instruction-selector-ppc.cc b/src/compiler/ppc/instruction-selector-ppc.cc
index 17fb5dc13f84f950a02f9ab66915158c19cdd79e..5b3008b91eb8f97c99ca33a9d95f29151b22d4bf 100644
--- a/src/compiler/ppc/instruction-selector-ppc.cc
+++ b/src/compiler/ppc/instruction-selector-ppc.cc
@@ -737,10 +737,14 @@ void InstructionSelector::VisitWord32Clz(Node* node) {
 }
 
 
-void InstructionSelector::VisitWord32Ctz(Node* node) { UNREACHABLE(); }
+void InstructionSelector::VisitWord32Popcnt(Node* node) {
+  PPCOperandGenerator g(this);
+  Emit(kPPC_Popcnt32, g.DefineAsRegister(node),
+       g.UseRegister(node->InputAt(0)));
+}
 
 
-void InstructionSelector::VisitWord32Popcnt(Node* node) { UNREACHABLE(); }
+void InstructionSelector::VisitWord32Ctz(Node* node) { UNREACHABLE(); }
 
 
 void InstructionSelector::VisitInt32Add(Node* node) {
@@ -1708,7 +1712,8 @@ MachineOperatorBuilder::Flags
 InstructionSelector::SupportedMachineOperatorFlags() {
   return MachineOperatorBuilder::kFloat64RoundDown |
          MachineOperatorBuilder::kFloat64RoundTruncate |
-         MachineOperatorBuilder::kFloat64RoundTiesAway;
+         MachineOperatorBuilder::kFloat64RoundTiesAway |
+         MachineOperatorBuilder::kWord32Popcnt;
   // We omit kWord32ShiftIsSafe as s[rl]w use 0x3f as a mask rather than 0x1f.
 }