[x64] Recognize MOVSXBL.

src/compiler/x64/code-generator-x64.cc

 // Copyright 2013 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.
 
 #include "src/compiler/code-generator.h"
 
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties-inl.h"
@@ skipping 465 matching lines @@
       break;
     case kSSEUint32ToFloat64:
       if (instr->InputAt(0)->IsRegister()) {
         __ movl(kScratchRegister, i.InputRegister(0));
       } else {
         __ movl(kScratchRegister, i.InputOperand(0));
       }
       __ cvtqsi2sd(i.OutputDoubleRegister(), kScratchRegister);
       break;
     case kX64Movsxbl:
-      __ movsxbl(i.OutputRegister(), i.MemoryOperand());
+      if (instr->addressing_mode() != kMode_None) {
+        __ movsxbl(i.OutputRegister(), i.MemoryOperand());
+      } else if (instr->InputAt(0)->IsRegister()) {
+        __ movsxbl(i.OutputRegister(), i.InputRegister(0));
+      } else {
+        __ movsxbl(i.OutputRegister(), i.InputOperand(0));
+      }
       __ AssertZeroExtended(i.OutputRegister());
       break;
     case kX64Movzxbl:
       __ movzxbl(i.OutputRegister(), i.MemoryOperand());
       break;
     case kX64Movb: {
       int index = 0;
       Operand operand = i.MemoryOperand(&index);
       if (HasImmediateInput(instr, index)) {
         __ movb(operand, Immediate(i.InputInt8(index)));
@@ skipping 528 matching lines @@
     }
   }
   MarkLazyDeoptSite();
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace compiler
 }  // namespace v8