bb2a830deb
MachineType is now a class with two enum fields: - MachineRepresentation - MachineSemantic Both enums are usable on their own, and this change switches some places from using MachineType to use just MachineRepresentation. Most notably: - register allocator now uses just the representation. - Phi and Select nodes only refer to representations. Review URL: https://codereview.chromium.org/1513543003 Cr-Commit-Position: refs/heads/master@{#32738}
62 lines
1.8 KiB
C++
62 lines
1.8 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_COMPILER_DIAMOND_H_
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#define V8_COMPILER_DIAMOND_H_
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#include "src/compiler/common-operator.h"
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#include "src/compiler/graph.h"
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#include "src/compiler/node.h"
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namespace v8 {
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namespace internal {
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namespace compiler {
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// A helper to make it easier to build diamond-shaped control patterns.
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struct Diamond {
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Graph* graph;
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CommonOperatorBuilder* common;
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Node* branch;
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Node* if_true;
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Node* if_false;
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Node* merge;
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Diamond(Graph* g, CommonOperatorBuilder* b, Node* cond,
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BranchHint hint = BranchHint::kNone) {
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graph = g;
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common = b;
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branch = graph->NewNode(common->Branch(hint), cond, graph->start());
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if_true = graph->NewNode(common->IfTrue(), branch);
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if_false = graph->NewNode(common->IfFalse(), branch);
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merge = graph->NewNode(common->Merge(2), if_true, if_false);
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}
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// Place {this} after {that} in control flow order.
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void Chain(Diamond& that) { branch->ReplaceInput(1, that.merge); }
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// Place {this} after {that} in control flow order.
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void Chain(Node* that) { branch->ReplaceInput(1, that); }
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// Nest {this} into either the if_true or if_false branch of {that}.
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void Nest(Diamond& that, bool if_true) {
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if (if_true) {
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branch->ReplaceInput(1, that.if_true);
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that.merge->ReplaceInput(0, merge);
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} else {
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branch->ReplaceInput(1, that.if_false);
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that.merge->ReplaceInput(1, merge);
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}
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}
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Node* Phi(MachineRepresentation rep, Node* tv, Node* fv) {
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return graph->NewNode(common->Phi(rep, 2), tv, fv, merge);
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}
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};
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} // namespace compiler
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} // namespace internal
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} // namespace v8
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#endif // V8_COMPILER_DIAMOND_H_
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