[turbofan] Avoid unnecessary write barriers and improve code generation.

src/compiler/instruction-codes.h

 // Copyright 2014 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_INSTRUCTION_CODES_H_
 #define V8_COMPILER_INSTRUCTION_CODES_H_
 
 #include <iosfwd>
 
 #if V8_TARGET_ARCH_ARM
@@ skipping 15 matching lines @@
 #else
 #define TARGET_ARCH_OPCODE_LIST(V)
 #define TARGET_ADDRESSING_MODE_LIST(V)
 #endif
 #include "src/utils.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
+// Modes for ArchStoreWithWriteBarrier below.
+enum class RecordWriteMode { kValueIsMap, kValueIsPointer, kValueIsAny };
+
+
 // Target-specific opcodes that specify which assembly sequence to emit.
 // Most opcodes specify a single instruction.
-#define ARCH_OPCODE_LIST(V)   \
-  V(ArchCallCodeObject)       \
-  V(ArchTailCallCodeObject)   \
-  V(ArchCallJSFunction)       \
-  V(ArchTailCallJSFunction)   \
-  V(ArchPrepareCallCFunction) \
-  V(ArchCallCFunction)        \
-  V(ArchLazyBailout)          \
-  V(ArchJmp)                  \
-  V(ArchLookupSwitch)         \
-  V(ArchTableSwitch)          \
-  V(ArchNop)                  \
-  V(ArchDeoptimize)           \
-  V(ArchRet)                  \
-  V(ArchStackPointer)         \
-  V(ArchFramePointer)         \
-  V(ArchTruncateDoubleToI)    \
-  V(CheckedLoadInt8)          \
-  V(CheckedLoadUint8)         \
-  V(CheckedLoadInt16)         \
-  V(CheckedLoadUint16)        \
-  V(CheckedLoadWord32)        \
-  V(CheckedLoadWord64)        \
-  V(CheckedLoadFloat32)       \
-  V(CheckedLoadFloat64)       \
-  V(CheckedStoreWord8)        \
-  V(CheckedStoreWord16)       \
-  V(CheckedStoreWord32)       \
-  V(CheckedStoreWord64)       \
-  V(CheckedStoreFloat32)      \
-  V(CheckedStoreFloat64)      \
+#define ARCH_OPCODE_LIST(V)    \
+  V(ArchCallCodeObject)        \
+  V(ArchTailCallCodeObject)    \
+  V(ArchCallJSFunction)        \
+  V(ArchTailCallJSFunction)    \
+  V(ArchPrepareCallCFunction)  \
+  V(ArchCallCFunction)         \
+  V(ArchLazyBailout)           \
+  V(ArchJmp)                   \
+  V(ArchLookupSwitch)          \
+  V(ArchTableSwitch)           \
+  V(ArchNop)                   \
+  V(ArchDeoptimize)            \
+  V(ArchRet)                   \
+  V(ArchStackPointer)          \
+  V(ArchFramePointer)          \
+  V(ArchTruncateDoubleToI)     \
+  V(ArchStoreWithWriteBarrier) \
+  V(CheckedLoadInt8)           \
+  V(CheckedLoadUint8)          \
+  V(CheckedLoadInt16)          \
+  V(CheckedLoadUint16)         \
+  V(CheckedLoadWord32)         \
+  V(CheckedLoadWord64)         \
+  V(CheckedLoadFloat32)        \
+  V(CheckedLoadFloat64)        \
+  V(CheckedStoreWord8)         \
+  V(CheckedStoreWord16)        \
+  V(CheckedStoreWord32)        \
+  V(CheckedStoreWord64)        \
+  V(CheckedStoreFloat32)       \
+  V(CheckedStoreFloat64)       \
   TARGET_ARCH_OPCODE_LIST(V)
 
 enum ArchOpcode {
 #define DECLARE_ARCH_OPCODE(Name) k##Name,
   ARCH_OPCODE_LIST(DECLARE_ARCH_OPCODE)
 #undef DECLARE_ARCH_OPCODE
 #define COUNT_ARCH_OPCODE(Name) +1
   kLastArchOpcode = -1 ARCH_OPCODE_LIST(COUNT_ARCH_OPCODE)
 #undef COUNT_ARCH_OPCODE
 };
@@ skipping 72 matching lines @@
 typedef BitField<AddressingMode, 8, 5> AddressingModeField;
 typedef BitField<FlagsMode, 13, 2> FlagsModeField;
 typedef BitField<FlagsCondition, 15, 5> FlagsConditionField;
 typedef BitField<int, 20, 12> MiscField;
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_INSTRUCTION_CODES_H_