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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,
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> const& forwarding,
InstructionSequence* code);
};
} // namespace compiler
} // namespace internal
} // namespace v8
#endif // V8_COMPILER_BACKEND_JUMP_THREADING_H_
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