PPC: [runtime] Implement %_ToLength via ToLengthStub.

src/ppc/code-stubs-ppc.cc

Index: src/ppc/code-stubs-ppc.cc
diff --git a/src/ppc/code-stubs-ppc.cc b/src/ppc/code-stubs-ppc.cc
index 02177e2b8c9ce636c78e3391bb2e29acde20cbfe..e98639e372c8d6880846c62548dbdd98ef28694f 100644
--- a/src/ppc/code-stubs-ppc.cc
+++ b/src/ppc/code-stubs-ppc.cc
@@ -3334,6 +3334,28 @@ void ToNumberStub::Generate(MacroAssembler* masm) {
 }
 
 
+void ToLengthStub::Generate(MacroAssembler* masm) {
+  // The ToLength stub takes one argument in r3.
+  Label not_smi;
+  __ JumpIfNotSmi(r3, &not_smi);
+  STATIC_ASSERT(kSmiTag == 0);
+  __ cmpi(r3, Operand::Zero());
+  if (CpuFeatures::IsSupported(ISELECT)) {
+    __ isel(lt, r3, r0, r3);
+  } else {
+    Label positive;
+    __ bgt(&positive);
+    __ li(r3, Operand::Zero());
+    __ bind(&positive);
+  }
+  __ Ret();
+  __ bind(&not_smi);
+
+  __ push(r3);  // Push argument.
+  __ TailCallRuntime(Runtime::kToLength, 1, 1);
+}
+
+
 void ToStringStub::Generate(MacroAssembler* masm) {
   // The ToString stub takes one argument in r3.
   Label is_number;