[builtins] Provide Math.floor as TurboFan builtin.

src/compiler/code-stub-assembler.h

Index: src/compiler/code-stub-assembler.h
diff --git a/src/compiler/code-stub-assembler.h b/src/compiler/code-stub-assembler.h
index ea8fa8219e991a82eaf004fa23f67c2de520d708..d9df7fa150f5d36bac04e87098d7a0a9f5c3f495 100644
--- a/src/compiler/code-stub-assembler.h
+++ b/src/compiler/code-stub-assembler.h
@@ -65,6 +65,8 @@ class Schedule;
   CODE_STUB_ASSEMBLER_COMPARE_BINARY_OP_LIST(V) \
   V(Float64Add)                                 \
   V(Float64Sub)                                 \
+  V(Float64InsertLowWord32)                     \
+  V(Float64InsertHighWord32)                    \
   V(IntPtrAdd)                                  \
   V(IntPtrAddWithOverflow)                      \
   V(IntPtrSub)                                  \
@@ -95,6 +97,8 @@ class Schedule;
   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)                    \
@@ -257,6 +261,9 @@ class CodeStubAssembler {
   // 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.
@@ -333,6 +340,7 @@ class CodeStubAssembler {
   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);