MIPS: Improve Lsa/Dlsa implementations.

src/mips/macro-assembler-mips.h

 // Copyright 2012 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_MIPS_MACRO_ASSEMBLER_MIPS_H_
 #define V8_MIPS_MACRO_ASSEMBLER_MIPS_H_
 
 #include "src/assembler.h"
 #include "src/globals.h"
 #include "src/mips/assembler-mips.h"
@@ skipping 629 matching lines @@
   DEFINE_INSTRUCTION(Slt);
   DEFINE_INSTRUCTION(Sltu);
 
   // MIPS32 R2 instruction macro.
   DEFINE_INSTRUCTION(Ror);
 
 #undef DEFINE_INSTRUCTION
 #undef DEFINE_INSTRUCTION2
 #undef DEFINE_INSTRUCTION3
 
+  // Load Scaled Address instructions. Parameter sa (shift argument) must be
+  // between [1, 31] (inclusive). On pre-r6 architectures the scratch register
+  // may be clobbered.
   void Lsa(Register rd, Register rs, Register rt, uint8_t sa,
            Register scratch = at);
+
   void Pref(int32_t hint, const MemOperand& rs);
 
 
   // ---------------------------------------------------------------------------
   // Pseudo-instructions.
 
   void mov(Register rd, Register rt) { or_(rd, rt, zero_reg); }
 
   void Ulw(Register rd, const MemOperand& rs);
   void Usw(Register rd, const MemOperand& rs);
@@ skipping 1121 matching lines @@
   MacroAssembler masm_;  // Macro assembler used to generate the code.
   FlushICache flush_cache_;  // Whether to flush the I cache after patching.
 };
 
 template <typename Func>
 void MacroAssembler::GenerateSwitchTable(Register index, size_t case_count,
                                          Func GetLabelFunction) {
   if (kArchVariant >= kMips32r6) {
     BlockTrampolinePoolFor(case_count + 5);
     addiupc(at, 5);
-    lsa(at, at, index, kPointerSizeLog2);
+    Lsa(at, at, index, kPointerSizeLog2);
     lw(at, MemOperand(at));
   } else {
     Label here;
     BlockTrampolinePoolFor(case_count + 10);
     push(ra);
     bal(&here);
     sll(at, index, kPointerSizeLog2);  // Branch delay slot.
     bind(&here);
     addu(at, at, ra);
     pop(ra);
@@ skipping 12 matching lines @@
 #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__)
 #define ACCESS_MASM(masm) masm->stop(__FILE_LINE__); masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_MIPS_MACRO_ASSEMBLER_MIPS_H_