Collect type feedback on result of Math.[round|ceil|floor]

src/x64/code-stubs-x64.cc

 // Copyright 2013 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.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
@@ skipping 2126 matching lines @@
   CallFunctionNoFeedback(masm,
                          arg_count(),
                          true,
                          CallAsMethod());
 
   // Unreachable.
   __ int3();
 }
 
 
+void CallIC_RoundStub::Generate(MacroAssembler* masm) {
+  Register function = rdi;
+  Register vector = rbx;
+  Register slot = rdx;
+
+  Register temp = rax;
+  XMMRegister xmm_temp1 = xmm1;
+  XMMRegister xmm_temp2 = xmm0;
+  Label tail, miss;
+
+  __ SmiToInteger64(slot, slot);
+
+  // Ensure nobody has snuck in another function.
+  __ BranchIfNotBuiltin(function, temp, kMathRound, &miss);
+
+  if (arg_count() > 0) {
+    __ movp(temp, Operand(rsp, arg_count() * kPointerSize));
+    Handle<Map> map = isolate()->factory()->heap_number_map();
+    __ CheckMap(temp, map, &tail, DO_SMI_CHECK);
+
+    __ movsd(xmm_temp1, FieldOperand(temp, HeapNumber::kValueOffset));
+
+    // If the number is >0, it doesn't round to -0
+    __ xorps(xmm_temp2, xmm_temp2);
+    __ ucomisd(xmm_temp1, xmm_temp2);
+    __ j(above, &tail, Label::kNear);
+
+    // If the number is <-.5, it doesn't round to -0
+    static int64_t minus_one_half = V8_INT64_C(0xBFE0000000000000);  // -0.5
+    __ movq(temp, minus_one_half);
+    __ movq(xmm_temp2, temp);
+    __ ucomisd(xmm_temp1, xmm_temp2);
+    __ j(below, &tail, Label::kNear);
+
+    // +0 doesn't round to -0
+    __ movmskpd(temp, xmm_temp1);
+    __ testl(temp, Immediate(1));
+    __ j(zero, &tail, Label::kNear);
+
+    __ Move(FieldOperand(vector, slot, times_pointer_size,
+                         FixedArray::kHeaderSize + kPointerSize),
+            Smi::FromInt(kHasReturnedMinusZeroSentinel));
+  }
+
+  __ bind(&tail);
+  CallFunctionNoFeedback(masm, arg_count(), true, CallAsMethod());
+
+  // Unreachable.
+  __ int3();
+
+  __ bind(&miss);
+  GenerateMiss(masm);
+  __ jmp(&tail);
+}
+
+
+void CallIC_FloorStub::Generate(MacroAssembler* masm) {
+  Register function = rdi;
+  Register vector = rbx;
+  Register slot = rdx;
+
+  Register temp1 = rax;
+  Register temp2 = rsi;
+  Label tail, miss;
+
+  __ SmiToInteger64(slot, slot);
+
+  // Ensure nobody has snuck in another function.
+  __ BranchIfNotBuiltin(function, temp1, kMathFloor, &miss);
+
+  if (arg_count() > 0) {
+    __ movp(temp1, Operand(rsp, arg_count() * kPointerSize));
+    Handle<Map> map = isolate()->factory()->heap_number_map();
+    __ CheckMap(temp1, map, &tail, DO_SMI_CHECK);
+
+    // Only -0 floors to -0.
+    __ movq(temp1, FieldOperand(temp1, HeapNumber::kValueOffset));
+    static int64_t minus_zero = V8_INT64_C(0x8000000000000000);  // -0.0
+    __ movq(temp2, minus_zero);
+    __ cmpq(temp1, temp2);
+    __ j(not_equal, &tail);
+
+    __ Move(FieldOperand(vector, slot, times_pointer_size,
+                         FixedArray::kHeaderSize + kPointerSize),
+            Smi::FromInt(kHasReturnedMinusZeroSentinel));
+  }
+
+  __ bind(&tail);
+  CallFunctionNoFeedback(masm, arg_count(), true, CallAsMethod());
+
+  // Unreachable.
+  __ int3();
+
+  __ bind(&miss);
+  GenerateMiss(masm);
+  __ jmp(&tail);
+}
+
+
+void CallIC_CeilStub::Generate(MacroAssembler* masm) {
+  Register function = rdi;
+  Register vector = rbx;
+  Register slot = rdx;
+
+  Register temp = rax;
+  XMMRegister xmm_temp1 = xmm1;
+  XMMRegister xmm_temp2 = xmm0;
+  Label tail, miss;
+
+  __ SmiToInteger64(slot, slot);
+
+  // Ensure nobody has snuck in another function.
+  __ BranchIfNotBuiltin(function, temp, kMathCeil, &miss);
+
+  if (arg_count() > 0) {
+    __ movp(temp, Operand(rsp, arg_count() * kPointerSize));
+    Handle<Map> map = isolate()->factory()->heap_number_map();
+    __ CheckMap(temp, map, &tail, DO_SMI_CHECK);
+
+    __ movsd(xmm_temp1, FieldOperand(rax, HeapNumber::kValueOffset));
+
+    // If the number is >0, it doesn't round to -0
+    __ xorps(xmm_temp2, xmm_temp2);
+    __ ucomisd(xmm_temp1, xmm_temp2);
+    __ j(greater, &tail, Label::kNear);
+
+    // If the number is <=-1, it doesn't round to -0
+    static int64_t minus_one = V8_INT64_C(0xbff0000000000000);  // -1
+    __ movq(temp, minus_one);
+    __ movq(xmm_temp2, temp);
+    __ ucomisd(xmm_temp1, xmm_temp2);
+    __ j(less_equal, &tail, Label::kNear);
+
+    // +0 doesn't round to -0.
+    __ movmskpd(temp, xmm_temp1);
+    __ testq(temp, Immediate(1));
+    __ j(zero, &tail, Label::kNear);
+
+    __ Move(FieldOperand(vector, slot, times_pointer_size,
+                         FixedArray::kHeaderSize + kPointerSize),
+            Smi::FromInt(kHasReturnedMinusZeroSentinel));
+  }
+
+  __ bind(&tail);
+  CallFunctionNoFeedback(masm, arg_count(), true, CallAsMethod());
+
+  // Unreachable.
+  __ int3();
+
+  __ bind(&miss);
+  GenerateMiss(masm);
+  __ jmp(&tail);
+}
+
+
 void CallICStub::Generate(MacroAssembler* masm) {
   // rdi - function
   // rdx - slot id
   // rbx - vector
   Isolate* isolate = masm->isolate();
   const int with_types_offset =
       FixedArray::OffsetOfElementAt(TypeFeedbackVector::kWithTypesIndex);
   const int generic_offset =
       FixedArray::OffsetOfElementAt(TypeFeedbackVector::kGenericCountIndex);
   Label extra_checks_or_miss, slow_start;
@@ skipping 89 matching lines @@
   // Goto miss case if we do not have a function.
   __ CmpObjectType(rdi, JS_FUNCTION_TYPE, rcx);
   __ j(not_equal, &miss);
 
   // Make sure the function is not the Array() function, which requires special
   // behavior on MISS.
   __ LoadGlobalFunction(Context::ARRAY_FUNCTION_INDEX, rcx);
   __ cmpp(rdi, rcx);
   __ j(equal, &miss);
 
+  __ movp(rax, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
+  __ movp(rax, FieldOperand(rax, SharedFunctionInfo::kFunctionDataOffset));
+  __ Cmp(rax, Smi::FromInt(0));
+  __ j(not_equal, &miss);
+
   // Update stats.
   __ SmiAddConstant(FieldOperand(rbx, with_types_offset), Smi::FromInt(1));
 
   // Store the function. Use a stub since we need a frame for allocation.
   // rbx - vector
   // rdx - slot (needs to be in smi form)
   // rdi - function
   {
     FrameScope scope(masm, StackFrame::INTERNAL);
     CreateWeakCellStub create_stub(isolate);
@@ skipping 2295 matching lines @@
 }
 
 
 void CallIC_ArrayTrampolineStub::Generate(MacroAssembler* masm) {
   EmitLoadTypeFeedbackVector(masm, rbx);
   CallIC_ArrayStub stub(isolate(), state());
   __ jmp(stub.GetCode(), RelocInfo::CODE_TARGET);
 }
 
 
+void CallIC_RoundTrampolineStub::Generate(MacroAssembler* masm) {
+  EmitLoadTypeFeedbackVector(masm, rbx);
+  CallIC_RoundStub stub(isolate(), state());
+  __ jmp(stub.GetCode(), RelocInfo::CODE_TARGET);
+}
+
+
+void CallIC_FloorTrampolineStub::Generate(MacroAssembler* masm) {
+  EmitLoadTypeFeedbackVector(masm, rbx);
+  CallIC_FloorStub stub(isolate(), state());
+  __ jmp(stub.GetCode(), RelocInfo::CODE_TARGET);
+}
+
+
+void CallIC_CeilTrampolineStub::Generate(MacroAssembler* masm) {
+  EmitLoadTypeFeedbackVector(masm, rbx);
+  CallIC_CeilStub stub(isolate(), state());
+  __ jmp(stub.GetCode(), RelocInfo::CODE_TARGET);
+}
+
+
 void ProfileEntryHookStub::MaybeCallEntryHook(MacroAssembler* masm) {
   if (masm->isolate()->function_entry_hook() != NULL) {
     ProfileEntryHookStub stub(masm->isolate());
     masm->CallStub(&stub);
   }
 }
 
 
 void ProfileEntryHookStub::Generate(MacroAssembler* masm) {
   // This stub can be called from essentially anywhere, so it needs to save
@@ skipping 769 matching lines @@
   CallApiFunctionAndReturn(masm, api_function_address, thunk_ref, getter_arg,
                            kStackSpace, nullptr, return_value_operand, NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64