Import Dart's parallel move resolver.
And write a few tests while at it.
A parallel move resolver will be needed for performing multiple moves
that are conceptually parallel, for example moves at a block
exit that branches to a block with phi nodes.
Change-Id: Ib95b247b4fc3f2c2fcab3b8c8d032abbd6104cd7
diff --git a/compiler/optimizing/parallel_move_test.cc b/compiler/optimizing/parallel_move_test.cc
new file mode 100644
index 0000000..88df24d
--- /dev/null
+++ b/compiler/optimizing/parallel_move_test.cc
@@ -0,0 +1,128 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "nodes.h"
+#include "parallel_move_resolver.h"
+#include "utils/arena_allocator.h"
+
+#include "gtest/gtest.h"
+
+namespace art {
+
+class TestParallelMoveResolver : public ParallelMoveResolver {
+ public:
+ explicit TestParallelMoveResolver(ArenaAllocator* allocator) : ParallelMoveResolver(allocator) {}
+
+ virtual void EmitMove(size_t index) {
+ MoveOperands* move = moves_.Get(index);
+ if (!message_.str().empty()) {
+ message_ << " ";
+ }
+ message_ << "("
+ << move->GetSource().reg().RegId()
+ << " -> "
+ << move->GetDestination().reg().RegId()
+ << ")";
+ }
+
+ virtual void EmitSwap(size_t index) {
+ MoveOperands* move = moves_.Get(index);
+ if (!message_.str().empty()) {
+ message_ << " ";
+ }
+ message_ << "("
+ << move->GetSource().reg().RegId()
+ << " <-> "
+ << move->GetDestination().reg().RegId()
+ << ")";
+ }
+
+ std::string GetMessage() const {
+ return message_.str();
+ }
+
+ private:
+ std::ostringstream message_;
+
+
+ DISALLOW_COPY_AND_ASSIGN(TestParallelMoveResolver);
+};
+
+static HParallelMove* BuildParallelMove(ArenaAllocator* allocator,
+ const size_t operands[][2],
+ size_t number_of_moves) {
+ HParallelMove* moves = new (allocator) HParallelMove(allocator);
+ for (size_t i = 0; i < number_of_moves; ++i) {
+ moves->AddMove(new (allocator) MoveOperands(
+ Location::RegisterLocation(ManagedRegister(operands[i][0])),
+ Location::RegisterLocation(ManagedRegister(operands[i][1]))));
+ }
+ return moves;
+}
+
+TEST(ParallelMoveTest, Dependency) {
+ ArenaPool pool;
+ ArenaAllocator allocator(&pool);
+
+ {
+ TestParallelMoveResolver resolver(&allocator);
+ static constexpr size_t moves[][2] = {{0, 1}, {1, 2}};
+ resolver.EmitNativeCode(BuildParallelMove(&allocator, moves, arraysize(moves)));
+ ASSERT_STREQ("(1 -> 2) (0 -> 1)", resolver.GetMessage().c_str());
+ }
+
+ {
+ TestParallelMoveResolver resolver(&allocator);
+ static constexpr size_t moves[][2] = {{0, 1}, {1, 2}, {2, 3}, {1, 4}};
+ resolver.EmitNativeCode(BuildParallelMove(&allocator, moves, arraysize(moves)));
+ ASSERT_STREQ("(2 -> 3) (1 -> 2) (1 -> 4) (0 -> 1)", resolver.GetMessage().c_str());
+ }
+}
+
+TEST(ParallelMoveTest, Swap) {
+ ArenaPool pool;
+ ArenaAllocator allocator(&pool);
+
+ {
+ TestParallelMoveResolver resolver(&allocator);
+ static constexpr size_t moves[][2] = {{0, 1}, {1, 0}};
+ resolver.EmitNativeCode(BuildParallelMove(&allocator, moves, arraysize(moves)));
+ ASSERT_STREQ("(1 <-> 0)", resolver.GetMessage().c_str());
+ }
+
+ {
+ TestParallelMoveResolver resolver(&allocator);
+ static constexpr size_t moves[][2] = {{0, 1}, {1, 2}, {1, 0}};
+ resolver.EmitNativeCode(BuildParallelMove(&allocator, moves, arraysize(moves)));
+ ASSERT_STREQ("(1 -> 2) (1 <-> 0)", resolver.GetMessage().c_str());
+ }
+
+ {
+ TestParallelMoveResolver resolver(&allocator);
+ static constexpr size_t moves[][2] = {{0, 1}, {1, 2}, {2, 3}, {3, 4}, {4, 1}};
+ resolver.EmitNativeCode(BuildParallelMove(&allocator, moves, arraysize(moves)));
+ ASSERT_STREQ("(4 <-> 1) (3 <-> 4) (2 <-> 3) (0 -> 1)", resolver.GetMessage().c_str());
+ }
+
+ {
+ TestParallelMoveResolver resolver(&allocator);
+ static constexpr size_t moves[][2] = {{0, 1}, {1, 2}, {2, 3}, {3, 4}, {4, 1}, {5, 4}};
+ resolver.EmitNativeCode(BuildParallelMove(&allocator, moves, arraysize(moves)));
+ ASSERT_STREQ("(4 <-> 1) (3 <-> 4) (2 <-> 3) (0 -> 1) (5 -> 4)", resolver.GetMessage().c_str());
+ }
+}
+
+} // namespace art