Bias commutative single-use register inputs and support lea adds

src/ia32/lithium-codegen-ia32.cc

Index: src/ia32/lithium-codegen-ia32.cc
diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
index 449ed3e917ee7a977858eb3c41e33a06eecb2426..bfed6d31568f5d3eb49b810ca5038c1c30ef98c5 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -1906,16 +1906,24 @@ void LCodeGen::DoThrow(LThrow* instr) {
 void LCodeGen::DoAddI(LAddI* instr) {
   LOperand* left = instr->left();
   LOperand* right = instr->right();
-  ASSERT(left->Equals(instr->result()));
 
-  if (right->IsConstantOperand()) {
-    __ add(ToOperand(left), ToInteger32Immediate(right));
+  if (LAddI::UseLea(instr->hydrogen()) && !left->Equals(instr->result())) {
+    if (right->IsConstantOperand()) {
+      int32_t offset = ToInteger32(LConstantOperand::cast(right));
+      __ lea(ToRegister(instr->result()), MemOperand(ToRegister(left), offset));
+    } else {
+      Operand address(ToRegister(left), ToRegister(right), times_1, 0);
+      __ lea(ToRegister(instr->result()), address);
+    }
   } else {
-    __ add(ToRegister(left), ToOperand(right));
-  }
-
-  if (instr->hydrogen()->CheckFlag(HValue::kCanOverflow)) {
-    DeoptimizeIf(overflow, instr->environment());
+    if (right->IsConstantOperand()) {
+      __ add(ToOperand(left), ToInteger32Immediate(right));
+    } else {
+      __ add(ToRegister(left), ToOperand(right));
+    }
+    if (instr->hydrogen()->CheckFlag(HValue::kCanOverflow)) {
+      DeoptimizeIf(overflow, instr->environment());
+    }
   }
 }