X87: [turbofan]: Micro optimizations to lea[l/q] on ia32/x64.

src/compiler/x87/code-generator-x87.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/compilation-info.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 1852 matching lines @@
           int32_t constant_summand = i.InputInt32(1);
           if (constant_summand > 0) {
             __ add(i.OutputRegister(), Immediate(constant_summand));
           } else if (constant_summand < 0) {
             __ sub(i.OutputRegister(), Immediate(-constant_summand));
           }
         } else if (mode == kMode_MR1) {
           if (i.InputRegister(1).is(i.OutputRegister())) {
             __ shl(i.OutputRegister(), 1);
           } else {
-            __ lea(i.OutputRegister(), i.MemoryOperand());
+            __ add(i.OutputRegister(), i.InputRegister(1));
           }
         } else if (mode == kMode_M2) {
           __ shl(i.OutputRegister(), 1);
         } else if (mode == kMode_M4) {
           __ shl(i.OutputRegister(), 2);
         } else if (mode == kMode_M8) {
           __ shl(i.OutputRegister(), 3);
         } else {
           __ lea(i.OutputRegister(), i.MemoryOperand());
         }
+      } else if (mode == kMode_MR1 &&
+                 i.InputRegister(1).is(i.OutputRegister())) {
+        __ add(i.OutputRegister(), i.InputRegister(0));
       } else {
         __ lea(i.OutputRegister(), i.MemoryOperand());
       }
       break;
     }
     case kX87Push:
       if (instr->InputAt(0)->IsFPRegister()) {
         auto allocated = AllocatedOperand::cast(*instr->InputAt(0));
         if (allocated.representation() == MachineRepresentation::kFloat32) {
           __ sub(esp, Immediate(kFloatSize));
@@ skipping 820 matching lines @@
     int padding_size = last_lazy_deopt_pc_ + space_needed - current_pc;
     __ Nop(padding_size);
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8