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

src/arm64/code-stubs-arm64.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_ARM64
 
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
@@ skipping 3093 matching lines @@
   // The slow case, we need this no matter what to complete a call after a miss.
   CallFunctionNoFeedback(masm,
                          arg_count(),
                          true,
                          CallAsMethod());
 
   __ Unreachable();
 }
 
 
+void CallIC_RoundStub::Generate(MacroAssembler* masm) {
+  Register function = x1;
+  Register vector = x2;
+  Register slot = x3;
+
+  Register temp1 = x0;
+  Register temp2 = x4;
+  DoubleRegister double_temp1 = d1;
+  DoubleRegister double_temp2 = d2;
+  Label tail, miss;
+
+  // Ensure nobody has snuck in another function.
+  __ BranchIfNotBuiltin(function, temp1, kMathRound, &miss);
+
+  if (arg_count() > 0) {
+    __ Ldr(temp1, MemOperand(jssp, (arg_count() - 1) * kPointerSize));
+    Handle<Map> map = isolate()->factory()->heap_number_map();
+    __ CheckMap(temp1, temp2, map, &tail, DO_SMI_CHECK);
+    __ Sub(temp1, temp1, Operand(kHeapObjectTag));
+    __ Ldr(double_temp1, MemOperand(temp1, HeapNumber::kValueOffset));
+
+    // If the number is >0, it doesn't round to -0
+    __ Fmov(double_temp2, 0);
+    __ Fcmp(double_temp1, double_temp2);
+    __ B(gt, &tail);
+
+    // If the number is <-.5, it doesn't round to -0
+    __ Fmov(double_temp2, -.5);
+    __ Fcmp(double_temp1, double_temp2);
+    __ B(lt, &tail);
+
+    __ Fmov(temp1, double_temp1);
+    __ Cmp(temp1, Operand(0x8000000000000000));
+    __ B(ne, &tail);
+
+    __ SmiUntag(temp1, slot);
+    __ Mov(temp1, Operand(temp1, LSL, kPointerSizeLog2));
+    __ Add(temp1, temp1, vector);
+    __ Mov(temp2, Smi::FromInt(kHasReturnedMinusZeroSentinel));
+    __ Str(temp2,
+           FieldMemOperand(temp1, FixedArray::kHeaderSize + kPointerSize));
+  }
+
+  __ bind(&tail);
+  // The slow case, we need this no matter what to complete a call after a miss.
+  CallFunctionNoFeedback(masm, arg_count(), true, CallAsMethod());
+
+  __ Unreachable();
+
+  __ bind(&miss);
+  GenerateMiss(masm);
+  __ b(&tail);
+}
+
+
+void CallIC_FloorStub::Generate(MacroAssembler* masm) {
+  Register function = x1;
+  Register vector = x2;
+  Register slot = x3;
+
+  Register temp1 = x0;
+  Register temp2 = x4;
+  DoubleRegister double_temp = d1;
+  Label tail, miss;
+
+  // Ensure nobody has snuck in another function.
+  __ BranchIfNotBuiltin(function, temp1, kMathFloor, &miss);
+
+  if (arg_count() > 0) {
+    __ Ldr(temp1, MemOperand(jssp, (arg_count() - 1) * kPointerSize));
+    Handle<Map> map = isolate()->factory()->heap_number_map();
+    __ CheckMap(temp1, temp2, map, &tail, DO_SMI_CHECK);
+    __ Sub(temp1, temp1, Operand(kHeapObjectTag));
+    __ Ldr(double_temp, MemOperand(temp1, HeapNumber::kValueOffset));
+
+    // Only -0 floors to -0.
+    __ Fmov(temp1, double_temp);
+    __ Cmp(temp1, Operand(0x8000000000000000));
+    __ B(ne, &tail);
+
+    __ SmiUntag(temp1, slot);
+    __ Mov(temp1, Operand(temp1, LSL, kPointerSizeLog2));
+    __ Add(temp1, temp1, vector);
+    __ Mov(temp2, Operand(Smi::FromInt(kHasReturnedMinusZeroSentinel)));
+    __ Str(temp2,
+           FieldMemOperand(temp1, FixedArray::kHeaderSize + kPointerSize));
+  }
+
+  __ bind(&tail);
+  // The slow case, we need this no matter what to complete a call after a miss.
+  CallFunctionNoFeedback(masm, arg_count(), true, CallAsMethod());
+
+  __ Unreachable();
+
+  __ bind(&miss);
+  GenerateMiss(masm);
+  __ b(&tail);
+}
+
+
+void CallIC_CeilStub::Generate(MacroAssembler* masm) {
+  Register function = x1;
+  Register vector = x2;
+  Register slot = x3;
+
+  Register temp1 = x0;
+  Register temp2 = x4;
+  DoubleRegister double_temp1 = d1;
+  DoubleRegister double_temp2 = d2;
+  Label tail, miss;
+
+  // Ensure nobody has snuck in another function.
+  __ BranchIfNotBuiltin(function, temp1, kMathCeil, &miss);
+
+  if (arg_count() > 0) {
+    __ Ldr(temp1, MemOperand(jssp, (arg_count() - 1) * kPointerSize));
+    Handle<Map> map = isolate()->factory()->heap_number_map();
+    __ CheckMap(temp1, temp2, map, &tail, DO_SMI_CHECK);
+    __ Sub(temp1, temp1, Operand(kHeapObjectTag));
+    __ Ldr(double_temp1, MemOperand(temp1, HeapNumber::kValueOffset));
+
+    // If the number is positive, it doesn't ceil to -0
+    __ Fmov(double_temp2, 0);
+    __ Fcmp(double_temp1, double_temp2);
+    __ B(gt, &tail);
+
+    // If it's less or equal to  1, it doesn't ceil to -0
+    __ Fmov(double_temp2, -1);
+    __ Fcmp(double_temp1, double_temp2);
+    __ B(le, &tail);
+
+    // +Zero doesn't round to -0
+    __ Fmov(temp1, double_temp1);
+    __ Cmp(temp1, Operand(0x8000000000000000));
+    __ B(ne, &tail);
+
+    __ SmiUntag(temp1, slot);
+    __ Mov(temp1, Operand(temp1, LSL, kPointerSizeLog2));
+    __ Add(temp1, temp1, vector);
+    __ Mov(temp2, Operand(Smi::FromInt(kHasReturnedMinusZeroSentinel)));
+    __ Str(temp2,
+           FieldMemOperand(temp1, FixedArray::kHeaderSize + kPointerSize));
+  }
+
+  __ bind(&tail);
+  // The slow case, we need this no matter what to complete a call after a miss.
+  CallFunctionNoFeedback(masm, arg_count(), true, CallAsMethod());
+
+  __ Unreachable();
+
+  __ bind(&miss);
+  GenerateMiss(masm);
+  __ b(&tail);
+}
+
+
 void CallICStub::Generate(MacroAssembler* masm) {
   ASM_LOCATION("CallICStub");
 
   // x1 - function
   // x3 - slot id (Smi)
   // x2 - vector
   const int with_types_offset =
       FixedArray::OffsetOfElementAt(TypeFeedbackVector::kWithTypesIndex);
   const int generic_offset =
       FixedArray::OffsetOfElementAt(TypeFeedbackVector::kGenericCountIndex);
@@ skipping 98 matching lines @@
 
   // Goto miss case if we do not have a function.
   __ JumpIfNotObjectType(function, x5, x5, JS_FUNCTION_TYPE, &miss);
 
   // Make sure the function is not the Array() function, which requires special
   // behavior on MISS.
   __ LoadGlobalFunction(Context::ARRAY_FUNCTION_INDEX, x5);
   __ Cmp(function, x5);
   __ B(eq, &miss);
 
+#if 0

[mvstanton, 2015/05/04 09:41:21]

Why is this commented out, I guess it should not be...

[danno, 2015/05/04 14:31:56]

Done.

+  // Some builtin functions require special handling, miss to the runtime.
+  __ Ldr(x0, FieldMemOperand(x1, JSFunction::kSharedFunctionInfoOffset));
+  __ Ldr(x0, FieldMemOperand(x0, SharedFunctionInfo::kFunctionDataOffset));
+  __ Cmp(x0, Operand(Smi::FromInt(0)));
+  __ B(ne, &miss);
+#endif
+
   // Update stats.
   __ Ldr(x4, FieldMemOperand(feedback_vector, with_types_offset));
   __ Adds(x4, x4, Operand(Smi::FromInt(1)));
   __ Str(x4, FieldMemOperand(feedback_vector, with_types_offset));
 
   // Store the function. Use a stub since we need a frame for allocation.
   // x2 - vector
   // x3 - slot
   // x1 - function
   {
@@ skipping 1249 matching lines @@
 }
 
 
 void CallIC_ArrayTrampolineStub::Generate(MacroAssembler* masm) {
   EmitLoadTypeFeedbackVector(masm, x2);
   CallIC_ArrayStub stub(isolate(), state());
   __ Jump(stub.GetCode(), RelocInfo::CODE_TARGET);
 }
 
 
+void CallIC_RoundTrampolineStub::Generate(MacroAssembler* masm) {
+  EmitLoadTypeFeedbackVector(masm, x2);
+  CallIC_RoundStub stub(isolate(), state());
+  __ Jump(stub.GetCode(), RelocInfo::CODE_TARGET);
+}
+
+
+void CallIC_FloorTrampolineStub::Generate(MacroAssembler* masm) {
+  EmitLoadTypeFeedbackVector(masm, x2);
+  CallIC_FloorStub stub(isolate(), state());
+  __ Jump(stub.GetCode(), RelocInfo::CODE_TARGET);
+}
+
+
+void CallIC_CeilTrampolineStub::Generate(MacroAssembler* masm) {
+  EmitLoadTypeFeedbackVector(masm, x2);
+  CallIC_CeilStub stub(isolate(), state());
+  __ Jump(stub.GetCode(), RelocInfo::CODE_TARGET);
+}
+
+
 void VectorRawLoadStub::Generate(MacroAssembler* masm) {
   GenerateImpl(masm, false);
 }
 
 
 void VectorRawLoadStub::GenerateForTrampoline(MacroAssembler* masm) {
   GenerateImpl(masm, true);
 }
 
 
@@ skipping 1240 matching lines @@
                            kStackUnwindSpace, NULL, spill_offset,
                            MemOperand(fp, 6 * kPointerSize), NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM64