Vyacheslav Egorov
8a179fb953
New folder structure (nested under vm/): - compiler/ - jit/ - JIT specific code - aot/ - AOT specific code - backend/ - all middle-end and back-end code (IL, flow graph) - assembler/ - assemblers and disassemblers - frontend/ - front ends (AST -> IL, Kernel -> IL) compiler/README.md would be the documentation root for the compiler pipeline Bug: https://github.com/dart-lang/sdk/issues/30575 Change-Id: I2dfd9688793bff737f7632ddc77fca766875ce36 Reviewed-on: https://dart-review.googlesource.com/2940 Reviewed-by: Vyacheslav Egorov <vegorov@google.com> Commit-Queue: Vyacheslav Egorov <vegorov@google.com>
55 lines
1.9 KiB
C++
55 lines
1.9 KiB
C++
// Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#ifndef RUNTIME_VM_COMPILER_BACKEND_BRANCH_OPTIMIZER_H_
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#define RUNTIME_VM_COMPILER_BACKEND_BRANCH_OPTIMIZER_H_
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#include "vm/allocation.h"
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namespace dart {
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class FlowGraph;
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class JoinEntryInstr;
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class Zone;
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class TargetEntryInstr;
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class Value;
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class BranchInstr;
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// Rewrite branches to eliminate materialization of boolean values after
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// inlining, and to expose other optimizations (e.g., constant folding of
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// branches, unreachable code elimination).
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class BranchSimplifier : public AllStatic {
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public:
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static void Simplify(FlowGraph* flow_graph);
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// Replace a target entry instruction with a join entry instruction. Does
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// not update the original target's predecessors to point to the new block
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// and does not replace the target in already computed block order lists.
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static JoinEntryInstr* ToJoinEntry(Zone* zone, TargetEntryInstr* target);
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private:
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// Match an instance of the pattern to rewrite. See the implementation
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// for the patterns that are handled by this pass.
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static bool Match(JoinEntryInstr* block);
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// Duplicate a branch while replacing its comparison's left and right
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// inputs.
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static BranchInstr* CloneBranch(Zone* zone,
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BranchInstr* branch,
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Value* new_left,
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Value* new_right);
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};
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// Rewrite diamond control flow patterns that materialize values to use more
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// efficient branchless code patterns if such are supported on the current
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// platform.
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class IfConverter : public AllStatic {
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public:
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static void Simplify(FlowGraph* flow_graph);
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};
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} // namespace dart
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#endif // RUNTIME_VM_COMPILER_BACKEND_BRANCH_OPTIMIZER_H_
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