v8/src/compiler/jump-threading.h
dcarney e928c9d52b [turbofan] remove dependence of InstructionBlock on BasicBlock
BUG=

Review URL: https://codereview.chromium.org/951553005

Cr-Commit-Position: refs/heads/master@{#26859}
2015-02-25 16:37:58 +00:00

34 lines
1.1 KiB
C++

// 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_JUMP_THREADING_H_
#define V8_COMPILER_JUMP_THREADING_H_
#include "src/compiler/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 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);
// Rewrite the instructions to forward jumps and branches.
// May also negate some branches.
static void ApplyForwarding(ZoneVector<RpoNumber>& forwarding,
InstructionSequence* code);
};
} // namespace compiler
} // namespace internal
} // namespace v8
#endif // V8_COMPILER_JUMP_THREADING_H