ARM optimize loading of immediates.

src/arm/assembler-arm.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // All Rights Reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions
 // are met:
 //
 // - Redistributions of source code must retain the above copyright notice,
 // this list of conditions and the following disclaimer.
 //
@@ skipping 369 matching lines @@
 };
 
 
 // Coprocessor load/store operand size
 enum LFlag {
   Long  = 1 << 22,  // long load/store coprocessor
   Short = 0 << 22   // short load/store coprocessor
 };
 
 
+// Opcode field of addrmode1 opcodes.
+enum AddrMode1Opcodes {
+  AND = 0 << 21,
+  EOR = 1 << 21,
+  SUB = 2 << 21,
+  RSB = 3 << 21,
+  ADD = 4 << 21,
+  ADC = 5 << 21,
+  SBC = 6 << 21,
+  RSC = 7 << 21,
+  TST = 8 << 21,
+  TEQ = 9 << 21,
+  CMP = 10 << 21,
+  CMN = 11 << 21,
+  ORR = 12 << 21,
+  MOV = 13 << 21,
+  BIC = 14 << 21,
+  MVN = 15 << 21
+};
+
 // -----------------------------------------------------------------------------
 // Machine instruction Operands
 
 // Class Operand represents a shifter operand in data processing instructions
 class Operand BASE_EMBEDDED {
  public:
   // immediate
   INLINE(explicit Operand(int32_t immediate,
          RelocInfo::Mode rmode = RelocInfo::NONE));
   INLINE(explicit Operand(const ExternalReference& f));
@@ skipping 610 matching lines @@
   void GrowBuffer();
   inline void emit(Instr x);
 
   // Instruction generation
   void addrmod1(Instr instr, Register rn, Register rd, const Operand& x);
   void addrmod2(Instr instr, Register rd, const MemOperand& x);
   void addrmod3(Instr instr, Register rd, const MemOperand& x);
   void addrmod4(Instr instr, Register rn, RegList rl);
   void addrmod5(Instr instr, CRegister crd, const MemOperand& x);
 
+  // Used by addrmod1 and a few other cases to load constants.
+  bool fit_to_shifter(Instr* instr, uint32_t imm32, bool addrmode1 = true);
+
   // Labels
   void print(Label* L);
   void bind_to(Label* L, int pos);
   void link_to(Label* L, Label* appendix);
   void next(Label* L);
 
   // Record reloc info for current pc_
   void RecordRelocInfo(RelocInfo::Mode rmode, intptr_t data = 0);
 
   friend class RegExpMacroAssemblerARM;
   friend class RelocInfo;
   friend class CodePatcher;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_ASSEMBLER_ARM_H_