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// Copyright 2014 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. #ifndef V8_COMPILER_BACKEND_JUMP_THREADING_H_ #define V8_COMPILER_BACKEND_JUMP_THREADING_H_ #include "src/compiler/backend/instruction.h" namespace v8 { namespace internal { namespace compiler { // Forwards jumps to empty basic blocks that end with a second jump to the // destination of the second jump, transitively. class V8_EXPORT_PRIVATE JumpThreading { public: // Compute the forwarding map of basic blocks to their ultimate destination. // Returns {true} if there is at least one block that is forwarded. static bool ComputeForwarding( Zone* local_zone, ZoneVector<RpoNumber>& result, // NOLINT(runtime/references) InstructionSequence* code, bool frame_at_start); // Rewrite the instructions to forward jumps and branches. // May also negate some branches. static void ApplyForwarding( Zone* local_zone, ZoneVector<RpoNumber>& forwarding, // NOLINT(runtime/references) InstructionSequence* code); }; } // namespace compiler } // namespace internal } // namespace v8 #endif // V8_COMPILER_BACKEND_JUMP_THREADING_H_