MIPS: Improve Lsa/Dlsa implementations.

src/mips64/macro-assembler-mips64.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/mips64/assembler-mips64.h"
@@ skipping 659 matching lines @@
   DEFINE_INSTRUCTION(Sltu);
 
   // MIPS32 R2 instruction macro.
   DEFINE_INSTRUCTION(Ror);
   DEFINE_INSTRUCTION(Dror);
 
 #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 Dlsa(Register rd, Register rs, Register rt, uint8_t sa,
             Register scratch = at);
 
   void Pref(int32_t hint, const MemOperand& rs);
 
 
   // ---------------------------------------------------------------------------
   // Pseudo-instructions.
@@ skipping 1257 matching lines @@
                                          Func GetLabelFunction) {
   // Ensure that dd-ed labels following this instruction use 8 bytes aligned
   // addresses.
   if (kArchVariant >= kMips64r6) {
     BlockTrampolinePoolFor(static_cast<int>(case_count) * 2 + 6);
     // Opposite of Align(8) as we have odd number of instructions in this case.
     if ((pc_offset() & 7) == 0) {
       nop();
     }
     addiupc(at, 5);
-    dlsa(at, at, index, kPointerSizeLog2);
+    Dlsa(at, at, index, kPointerSizeLog2);
     ld(at, MemOperand(at));
   } else {
     Label here;
     BlockTrampolinePoolFor(static_cast<int>(case_count) * 2 + 11);
     Align(8);
     push(ra);
     bal(&here);
     dsll(at, index, kPointerSizeLog2);  // Branch delay slot.
     bind(&here);
     daddu(at, at, ra);
@@ skipping 13 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_