[builtins] Provide Math.floor as TurboFan builtin.

src/compiler/code-stub-assembler.h

 // Copyright 2015 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.
 
 #ifndef V8_COMPILER_CODE_STUB_ASSEMBLER_H_
 #define V8_COMPILER_CODE_STUB_ASSEMBLER_H_
 
 #include <map>
 
 // Clients of this interface shouldn't depend on lots of compiler internals.
@@ skipping 47 matching lines @@
   V(WordNotEqual)                                     \
   V(Word32Equal)                                      \
   V(Word32NotEqual)                                   \
   V(Word64Equal)                                      \
   V(Word64NotEqual)
 
 #define CODE_STUB_ASSEMBLER_BINARY_OP_LIST(V)   \
   CODE_STUB_ASSEMBLER_COMPARE_BINARY_OP_LIST(V) \
   V(Float64Add)                                 \
   V(Float64Sub)                                 \
+  V(Float64InsertLowWord32)                     \
+  V(Float64InsertHighWord32)                    \
   V(IntPtrAdd)                                  \
   V(IntPtrAddWithOverflow)                      \
   V(IntPtrSub)                                  \
   V(IntPtrSubWithOverflow)                      \
   V(Int32Add)                                   \
   V(Int32AddWithOverflow)                       \
   V(Int32Sub)                                   \
   V(Int32Mul)                                   \
   V(WordOr)                                     \
   V(WordAnd)                                    \
@@ skipping 10 matching lines @@
   V(Word32Sar)                                  \
   V(Word32Ror)                                  \
   V(Word64Or)                                   \
   V(Word64And)                                  \
   V(Word64Xor)                                  \
   V(Word64Shr)                                  \
   V(Word64Sar)                                  \
   V(Word64Ror)
 
 #define CODE_STUB_ASSEMBLER_UNARY_OP_LIST(V) \
+  V(Float64ExtractLowWord32)                 \

[epertoso, 2016/03/28 09:55:08]

Do we really need to expose these two?

[Benedikt Meurer, 2016/03/28 17:00:58]

You are right, we don't need to.

+  V(Float64ExtractHighWord32)                \
   V(Float64Sqrt)                             \
   V(ChangeFloat64ToUint32)                   \
   V(ChangeInt32ToFloat64)                    \
   V(ChangeInt32ToInt64)                      \
   V(ChangeUint32ToFloat64)                   \
   V(ChangeUint32ToUint64)
 
 class CodeStubAssembler {
  public:
   // Create with CallStub linkage.
@@ skipping 142 matching lines @@
                      Node* context, Node* arg1, Node* arg2,
                      size_t result_size = 1);
 
   Node* TailCall(const CallInterfaceDescriptor& descriptor, Node* target,
                  Node** args, size_t result_size = 1);
 
   // ===========================================================================
   // Macros
   // ===========================================================================
 
+  // Float64 operations.
+  Node* Float64Floor(Node* x);
+
   // Tag a Word as a Smi value.
   Node* SmiTag(Node* value);
   // Untag a Smi value as a Word.
   Node* SmiUntag(Node* value);
 
   // Smi conversions.
   Node* SmiToFloat64(Node* value);
   Node* SmiToWord32(Node* value);
 
   // Smi operations.
@@ skipping 56 matching lines @@
 
   // Returns a node that is true if the given bit is set in |word32|.
   template <typename T>
   Node* BitFieldDecode(Node* word32) {
     return BitFieldDecode(word32, T::kShift, T::kMask);
   }
 
   Node* BitFieldDecode(Node* word32, uint32_t shift, uint32_t mask);
 
   // Conversions.
+  Node* ChangeFloat64ToTagged(Node* value);
   Node* ChangeInt32ToTagged(Node* value);
   Node* TruncateTaggedToFloat64(Node* context, Node* value);
   Node* TruncateTaggedToWord32(Node* context, Node* value);
 
   // Branching helpers.
   // TODO(danno): Can we be more cleverish wrt. edge-split?
   void BranchIf(Node* condition, Label* if_true, Label* if_false);
 
 #define BRANCH_HELPER(name)                                                \
   void BranchIf##name(Node* a, Node* b, Label* if_true, Label* if_false) { \
@@ skipping 91 matching lines @@
   // Map of variables to the list of value nodes that have been added from each
   // merge path in their order of merging.
   std::map<Variable::Impl*, std::vector<Node*>> variable_merges_;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_CODE_STUB_ASSEMBLER_H_