PPC: [runtime] Implement %_ToLength via ToLengthStub.

src/ppc/code-stubs-ppc.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.
 
 #if V8_TARGET_ARCH_PPC
 
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 3316 matching lines @@
   __ bne(&not_oddball);
   __ LoadP(r3, FieldMemOperand(r3, Oddball::kToNumberOffset));
   __ blr();
   __ bind(&not_oddball);
 
   __ push(r3);  // Push argument.
   __ TailCallRuntime(Runtime::kToNumber, 1, 1);
 }
 
 
+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;
   __ JumpIfSmi(r3, &is_number);
 
   __ CompareObjectType(r3, r4, r4, FIRST_NONSTRING_TYPE);
   // r3: receiver
   // r4: receiver instance type
   __ Ret(lt);
 
@@ skipping 2494 matching lines @@
                            kStackUnwindSpace, NULL,
                            MemOperand(fp, 6 * kPointerSize), NULL);
 }
 
 
 #undef __
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_PPC