[turbofan] Introduce CheckUnless.

src/compiler/simplified-operator.cc

 // 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.
 
 #include "src/compiler/simplified-operator.h"
 
 #include "src/base/lazy-instance.h"
 #include "src/compiler/opcodes.h"
 #include "src/compiler/operator.h"
 #include "src/types.h"
@@ skipping 348 matching lines @@
   CheckTaggedHoleOperator<CheckTaggedHoleMode::kNeverReturnHole>
       kCheckTaggedHoleNeverReturnHoleOperator;
 
   struct CheckIfOperator final : public Operator {
     CheckIfOperator()
         : Operator(IrOpcode::kCheckIf, Operator::kPure, "CheckIf", 1, 1, 1, 0,
                    1, 0) {}
   };
   CheckIfOperator kCheckIf;
 
+  struct CheckUnlessOperator final : public Operator {
+    CheckUnlessOperator()
+        : Operator(IrOpcode::kCheckUnless, Operator::kPure, "CheckUnless", 1, 1,
+                   1, 0, 1, 0) {}
+  };
+  CheckUnlessOperator kCheckUnless;
+
   template <PretenureFlag kPretenure>
   struct AllocateOperator final : public Operator1<PretenureFlag> {
     AllocateOperator()
         : Operator1<PretenureFlag>(IrOpcode::kAllocate, Operator::kNoThrow,
                                    "Allocate", 1, 1, 1, 1, 1, 0, kPretenure) {}
   };
   AllocateOperator<NOT_TENURED> kAllocateNotTenuredOperator;
   AllocateOperator<TENURED> kAllocateTenuredOperator;
 
 #define BUFFER_ACCESS(Type, type, TYPE, ctype, size)                          \
@@ skipping 56 matching lines @@
       return &cache_.kCheckTaggedHoleNeverReturnHoleOperator;
   }
   UNREACHABLE();
   return nullptr;
 }
 
 const Operator* SimplifiedOperatorBuilder::CheckIf() {
   return &cache_.kCheckIf;
 }
 
+const Operator* SimplifiedOperatorBuilder::CheckUnless() {
+  return &cache_.kCheckUnless;
+}
+
 const Operator* SimplifiedOperatorBuilder::ReferenceEqual(Type* type) {
   return new (zone()) Operator(IrOpcode::kReferenceEqual,
                                Operator::kCommutative | Operator::kPure,
                                "ReferenceEqual", 2, 0, 0, 1, 0, 0);
 }
 
 const Operator* SimplifiedOperatorBuilder::CheckBounds() {
   // TODO(bmeurer): Cache this operator. Make it pure!
   return new (zone()) Operator(IrOpcode::kCheckBounds, Operator::kPure,
                                "CheckBounds", 2, 1, 1, 1, 1, 0);
@@ skipping 97 matching lines @@
         Operator1<Type>(IrOpcode::k##Name, Operator::kNoThrow | properties,    \
                         #Name, value_input_count, 1, control_input_count,      \
                         output_count, 1, 0, access);                           \
   }
 ACCESS_OP_LIST(ACCESS)
 #undef ACCESS
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8