if (answer >= Smi::kMinValue && answer <= Smi::kMaxValue) {
// If the product is zero and the non-zero factor is negative,
// the spec requires us to return floating point negative zero.
- if (answer != 0 || (left >= 0 && right >= 0)) {
+ if (answer != 0 || (left + right) >= 0) {
answer_object = Smi::FromInt(static_cast<int>(answer));
}
}
void UnarySubStub::Generate(MacroAssembler* masm) {
Label slow;
Label done;
-
+ Label try_float;
+ Label special;
// Check whether the value is a smi.
__ testl(rax, Immediate(kSmiTagMask));
- // TODO(X64): Add inline code that handles floats, as on ia32 platform.
- __ j(not_zero, &slow);
+ __ j(not_zero, &try_float);
+
// Enter runtime system if the value of the smi is zero
// to make sure that we switch between 0 and -0.
// Also enter it if the value of the smi is Smi::kMinValue
__ testl(rax, Immediate(0x7FFFFFFE));
- __ j(zero, &slow);
+ __ j(zero, &special);
__ neg(rax);
__ jmp(&done);
+
+ __ bind(&special);
+ // Either zero or -0x4000000, neither of which become a smi when negated.
+ __ testl(rax, rax);
+ __ j(not_zero, &slow);
+ __ Move(rax, Factory::minus_zero_value());
+ __ jmp(&done);
+
// Enter runtime system.
__ bind(&slow);
__ pop(rcx); // pop return address
__ push(rax);
__ push(rcx); // push return address
__ InvokeBuiltin(Builtins::UNARY_MINUS, JUMP_FUNCTION);
+ __ jmp(&done);
+
+ // Try floating point case.
+ __ bind(&try_float);
+ __ movq(rdx, FieldOperand(rax, HeapObject::kMapOffset));
+ __ Cmp(rdx, Factory::heap_number_map());
+ __ j(not_equal, &slow);
+ // Operand is a float, negate its value by flipping sign bit.
+ __ movq(rdx, FieldOperand(rax, HeapNumber::kValueOffset));
+ __ movq(kScratchRegister, Immediate(0x01));
+ __ shl(kScratchRegister, Immediate(63));
+ __ xor_(rdx, kScratchRegister); // Flip sign.
+ // rdx is value to store.
+ if (overwrite_) {
+ __ movq(FieldOperand(rax, HeapNumber::kValueOffset), rdx);
+ } else {
+ FloatingPointHelper::AllocateHeapNumber(masm, &slow, rbx, rcx);
+ // rcx: allocated 'empty' number
+ __ movq(FieldOperand(rcx, HeapNumber::kValueOffset), rdx);
+ __ movq(rax, rcx);
+ }
__ bind(&done);
__ StubReturn(1);