[interpreter] Bytecode register optimizer.

test/cctest/interpreter/bytecode_expectations/ObjectLiterals.golden

 #
 # Autogenerated by generate-bytecode-expectations.
 #
 
 ---
 pool type: mixed
 execute: yes
 wrap: yes
 
 ---
@@ skipping 56 matching lines @@
   InstanceType::FIXED_ARRAY_TYPE,
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   var a = 1; return { val: a, val: a + 1 };
 "
-frame size: 3
+frame size: 2
 parameter count: 1
-bytecode array length: 26
+bytecode array length: 23
 bytecodes: [
   /*   30 E> */ B(StackCheck),
   /*   42 S> */ B(LdaSmi), U8(1),
                 B(Star), R(0),
   /*   45 S> */ B(CreateObjectLiteral), U8(0), U8(0), U8(1),
                 B(Star), R(1),
-  /*   59 E> */ B(Ldar), R(0),
-  /*   67 E> */ B(Star), R(2),
-                B(LdaSmi), U8(1),
-                B(Add), R(2),
+  /*   59 E> */ B(Nop),
+  /*   67 E> */ B(LdaSmi), U8(1),
+                B(Add), R(0),
                 B(StaNamedPropertySloppy), R(1), U8(1), U8(1),
                 B(Ldar), R(1),
   /*   76 S> */ B(Return),
 ]
 constant pool: [
   InstanceType::FIXED_ARRAY_TYPE,
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
 ]
 handlers: [
 ]
@@ skipping 50 matching lines @@
 snippet: "
   return { get a() { return 2; } };
 "
 frame size: 6
 parameter count: 1
 bytecode array length: 33
 bytecodes: [
   /*   30 E> */ B(StackCheck),
   /*   34 S> */ B(CreateObjectLiteral), U8(0), U8(0), U8(1),
                 B(Star), R(0),
-                B(Mov), R(0), R(1),
                 B(LdaConstant), U8(1),
                 B(Star), R(2),
                 B(CreateClosure), U8(2), U8(0),
                 B(Star), R(3),
                 B(LdaNull),
                 B(Star), R(4),
                 B(LdaZero),
                 B(Star), R(5),
+                B(Mov), R(0), R(1),
                 B(CallRuntime), U16(Runtime::kDefineAccessorPropertyUnchecked), R(1), U8(5),
                 B(Ldar), R(0),
   /*   68 S> */ B(Return),
 ]
 constant pool: [
   InstanceType::FIXED_ARRAY_TYPE,
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
   InstanceType::SHARED_FUNCTION_INFO_TYPE,
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   return { get a() { return this.x; }, set a(val) { this.x = val } };
 "
 frame size: 6
 parameter count: 1
 bytecode array length: 35
 bytecodes: [
   /*   30 E> */ B(StackCheck),
   /*   34 S> */ B(CreateObjectLiteral), U8(0), U8(0), U8(1),
                 B(Star), R(0),
-                B(Mov), R(0), R(1),
                 B(LdaConstant), U8(1),
                 B(Star), R(2),
                 B(CreateClosure), U8(2), U8(0),
                 B(Star), R(3),
                 B(CreateClosure), U8(3), U8(0),
                 B(Star), R(4),
                 B(LdaZero),
                 B(Star), R(5),
+                B(Mov), R(0), R(1),
                 B(CallRuntime), U16(Runtime::kDefineAccessorPropertyUnchecked), R(1), U8(5),
                 B(Ldar), R(0),
   /*  102 S> */ B(Return),
 ]
 constant pool: [
   InstanceType::FIXED_ARRAY_TYPE,
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
   InstanceType::SHARED_FUNCTION_INFO_TYPE,
   InstanceType::SHARED_FUNCTION_INFO_TYPE,
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   return { set b(val) { this.y = val } };
 "
 frame size: 6
 parameter count: 1
 bytecode array length: 33
 bytecodes: [
   /*   30 E> */ B(StackCheck),
   /*   34 S> */ B(CreateObjectLiteral), U8(0), U8(0), U8(1),
                 B(Star), R(0),
-                B(Mov), R(0), R(1),
                 B(LdaConstant), U8(1),
                 B(Star), R(2),
                 B(LdaNull),
                 B(Star), R(3),
                 B(CreateClosure), U8(2), U8(0),
                 B(Star), R(4),
                 B(LdaZero),
                 B(Star), R(5),
+                B(Mov), R(0), R(1),
                 B(CallRuntime), U16(Runtime::kDefineAccessorPropertyUnchecked), R(1), U8(5),
                 B(Ldar), R(0),
   /*   74 S> */ B(Return),
 ]
 constant pool: [
   InstanceType::FIXED_ARRAY_TYPE,
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
   InstanceType::SHARED_FUNCTION_INFO_TYPE,
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   var a = 1; return { 1: a };
 "
 frame size: 6
 parameter count: 1
-bytecode array length: 33
+bytecode array length: 32
 bytecodes: [
   /*   30 E> */ B(StackCheck),
   /*   42 S> */ B(LdaSmi), U8(1),
                 B(Star), R(0),
   /*   45 S> */ B(CreateObjectLiteral), U8(0), U8(0), U8(1),
                 B(Star), R(1),
-                B(Mov), R(1), R(2),
                 B(LdaSmi), U8(1),
                 B(Star), R(3),
-  /*   57 E> */ B(Ldar), R(0),
-                B(Star), R(4),
-                B(LdaZero),
+  /*   57 E> */ B(LdaZero),
                 B(Star), R(5),
+                B(Mov), R(1), R(2),
+                B(Mov), R(0), R(4),
                 B(CallRuntime), U16(Runtime::kSetProperty), R(2), U8(4),
                 B(Ldar), R(1),
   /*   62 S> */ B(Return),
 ]
 constant pool: [
   InstanceType::FIXED_ARRAY_TYPE,
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   return { __proto__: null };
 "
 frame size: 3
 parameter count: 1
 bytecode array length: 21
 bytecodes: [
   /*   30 E> */ B(StackCheck),
   /*   34 S> */ B(CreateObjectLiteral), U8(0), U8(0), U8(35),
                 B(Star), R(0),
-                B(Mov), R(0), R(1),
                 B(LdaNull),
                 B(Star), R(2),
+                B(Mov), R(0), R(1),
                 B(CallRuntime), U16(Runtime::kInternalSetPrototype), R(1), U8(2),
                 B(Ldar), R(0),
   /*   62 S> */ B(Return),
 ]
 constant pool: [
   InstanceType::FIXED_ARRAY_TYPE,
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   var a = 'test'; return { [a]: 1 };
 "
 frame size: 7
 parameter count: 1
 bytecode array length: 37
 bytecodes: [
   /*   30 E> */ B(StackCheck),
   /*   42 S> */ B(LdaConstant), U8(0),
                 B(Star), R(0),
   /*   50 S> */ B(CreateObjectLiteral), U8(1), U8(0), U8(35),
                 B(Star), R(1),
-                B(Mov), R(1), R(2),
   /*   60 E> */ B(Ldar), R(0),
                 B(ToName),
                 B(Star), R(3),
                 B(LdaSmi), U8(1),
                 B(Star), R(4),
                 B(LdaZero),
                 B(Star), R(5),
                 B(LdaZero),
                 B(Star), R(6),
+                B(Mov), R(1), R(2),
                 B(CallRuntime), U16(Runtime::kDefineDataPropertyInLiteral), R(2), U8(5),
                 B(Ldar), R(1),
   /*   69 S> */ B(Return),
 ]
 constant pool: [
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
   InstanceType::FIXED_ARRAY_TYPE,
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   var a = 'test'; return { val: a, [a]: 1 };
 "
 frame size: 7
 parameter count: 1
-bytecode array length: 43
+bytecode array length: 41
 bytecodes: [
   /*   30 E> */ B(StackCheck),
   /*   42 S> */ B(LdaConstant), U8(0),
                 B(Star), R(0),
   /*   50 S> */ B(CreateObjectLiteral), U8(1), U8(0), U8(1),
                 B(Star), R(1),
   /*   64 E> */ B(Ldar), R(0),
                 B(StaNamedPropertySloppy), R(1), U8(2), U8(1),
-                B(Mov), R(1), R(2),
-  /*   68 E> */ B(Ldar), R(0),
-                B(ToName),
+  /*   68 E> */ B(ToName),
                 B(Star), R(3),
                 B(LdaSmi), U8(1),
                 B(Star), R(4),
                 B(LdaZero),
                 B(Star), R(5),
                 B(LdaZero),
                 B(Star), R(6),
+                B(Mov), R(1), R(2),
                 B(CallRuntime), U16(Runtime::kDefineDataPropertyInLiteral), R(2), U8(5),
                 B(Ldar), R(1),
   /*   77 S> */ B(Return),
 ]
 constant pool: [
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
   InstanceType::FIXED_ARRAY_TYPE,
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   var a = 'test'; return { [a]: 1, __proto__: {} };
 "
 frame size: 7
 parameter count: 1
-bytecode array length: 53
+bytecode array length: 54
 bytecodes: [
   /*   30 E> */ B(StackCheck),
   /*   42 S> */ B(LdaConstant), U8(0),
                 B(Star), R(0),
   /*   50 S> */ B(CreateObjectLiteral), U8(1), U8(1), U8(35),
                 B(Star), R(1),
-                B(Mov), R(1), R(2),
   /*   60 E> */ B(Ldar), R(0),
                 B(ToName),
                 B(Star), R(3),
                 B(LdaSmi), U8(1),
                 B(Star), R(4),
                 B(LdaZero),
                 B(Star), R(5),
                 B(LdaZero),
                 B(Star), R(6),
+                B(Mov), R(1), R(2),
                 B(CallRuntime), U16(Runtime::kDefineDataPropertyInLiteral), R(2), U8(5),
-                B(Mov), R(1), R(2),
                 B(CreateObjectLiteral), U8(1), U8(0), U8(35),
                 B(Star), R(4),
-                B(Star), R(3),
+                B(Mov), R(1), R(2),
+                B(Mov), R(4), R(3),
                 B(CallRuntime), U16(Runtime::kInternalSetPrototype), R(2), U8(2),
                 B(Ldar), R(1),
   /*   84 S> */ B(Return),
 ]
 constant pool: [
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
   InstanceType::FIXED_ARRAY_TYPE,
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   var n = 'name'; return { [n]: 'val', get a() { }, set a(b) {} };
 "
 frame size: 7
 parameter count: 1
 bytecode array length: 77
 bytecodes: [
   /*   30 E> */ B(StackCheck),
   /*   42 S> */ B(LdaConstant), U8(0),
                 B(Star), R(0),
   /*   50 S> */ B(CreateObjectLiteral), U8(1), U8(0), U8(35),
                 B(Star), R(1),
-                B(Mov), R(1), R(2),
   /*   60 E> */ B(Ldar), R(0),
                 B(ToName),
                 B(Star), R(3),
                 B(LdaConstant), U8(2),
                 B(Star), R(4),
                 B(LdaZero),
                 B(Star), R(5),
                 B(LdaZero),
                 B(Star), R(6),
+                B(Mov), R(1), R(2),
                 B(CallRuntime), U16(Runtime::kDefineDataPropertyInLiteral), R(2), U8(5),
-                B(Mov), R(1), R(2),
                 B(LdaConstant), U8(3),
                 B(Star), R(3),
                 B(CreateClosure), U8(4), U8(0),
                 B(Star), R(4),
                 B(LdaZero),
                 B(Star), R(5),
+                B(Mov), R(1), R(2),
                 B(CallRuntime), U16(Runtime::kDefineGetterPropertyUnchecked), R(2), U8(4),
-                B(Mov), R(1), R(2),
                 B(LdaConstant), U8(3),
                 B(Star), R(3),
                 B(CreateClosure), U8(5), U8(0),
                 B(Star), R(4),
                 B(LdaZero),
                 B(Star), R(5),
+                B(Mov), R(1), R(2),
                 B(CallRuntime), U16(Runtime::kDefineSetterPropertyUnchecked), R(2), U8(4),
                 B(Ldar), R(1),
   /*   99 S> */ B(Return),
 ]
 constant pool: [
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
   InstanceType::FIXED_ARRAY_TYPE,
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
   InstanceType::SHARED_FUNCTION_INFO_TYPE,
   InstanceType::SHARED_FUNCTION_INFO_TYPE,
 ]
 handlers: [
 ]