81ee94b650
Review URL: https://codereview.chromium.org/1405363003 Cr-Commit-Position: refs/heads/master@{#31410}
54 lines
1.5 KiB
C++
54 lines
1.5 KiB
C++
// Copyright 2013 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef V8_CRANKSHAFT_HYDROGEN_MARK_DEOPTIMIZE_H_
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#define V8_CRANKSHAFT_HYDROGEN_MARK_DEOPTIMIZE_H_
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#include "src/crankshaft/hydrogen.h"
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namespace v8 {
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namespace internal {
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// Compute DeoptimizeOnUndefined flag for phis. Any phi that can reach a use
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// with DeoptimizeOnUndefined set must have DeoptimizeOnUndefined set.
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// Currently only HCompareNumericAndBranch, with double input representation,
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// has this flag set. The flag is used by HChange tagged->double, which must
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// deoptimize if one of its uses has this flag set.
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class HMarkDeoptimizeOnUndefinedPhase : public HPhase {
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public:
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explicit HMarkDeoptimizeOnUndefinedPhase(HGraph* graph)
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: HPhase("H_Mark deoptimize on undefined", graph),
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worklist_(16, zone()) {}
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void Run();
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private:
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void ProcessPhi(HPhi* phi);
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// Preallocated worklist used as an optimization so we don't have
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// to allocate a new ZoneList for every ProcessPhi() invocation.
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ZoneList<HPhi*> worklist_;
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DISALLOW_COPY_AND_ASSIGN(HMarkDeoptimizeOnUndefinedPhase);
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};
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class HComputeChangeUndefinedToNaN : public HPhase {
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public:
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explicit HComputeChangeUndefinedToNaN(HGraph* graph)
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: HPhase("H_Compute change undefined to nan", graph) {}
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void Run();
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private:
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DISALLOW_COPY_AND_ASSIGN(HComputeChangeUndefinedToNaN);
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};
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} // namespace internal
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} // namespace v8
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#endif // V8_CRANKSHAFT_HYDROGEN_MARK_DEOPTIMIZE_H_
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