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// 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.
#include "src/compiler/select-lowering.h"
#include "test/unittests/compiler/graph-unittest.h"
#include "test/unittests/compiler/node-test-utils.h"
#include "testing/gmock-support.h"
using testing::AllOf;
using testing::Capture;
using testing::CaptureEq;
using testing::Not;
namespace v8 {
namespace internal {
namespace compiler {
class SelectLoweringTest : public GraphTest {
public:
SelectLoweringTest() : GraphTest(5), lowering_(graph(), common()) {}
protected:
Reduction Reduce(Node* node) { return lowering_.Reduce(node); }
private:
SelectLowering lowering_;
};
TEST_F(SelectLoweringTest, SelectWithSameConditions) {
Node* const p0 = Parameter(0);
Node* const p1 = Parameter(1);
Node* const p2 = Parameter(2);
Node* const p3 = Parameter(3);
Node* const p4 = Parameter(4);
Node* const s0 = graph()->NewNode(common()->Select(kMachInt32), p0, p1, p2);
Capture<Node*> branch;
Capture<Node*> merge;
{
Reduction const r = Reduce(s0);
ASSERT_TRUE(r.Changed());
EXPECT_THAT(
r.replacement(),
IsPhi(
kMachInt32, p1, p2,
AllOf(CaptureEq(&merge),
IsMerge(IsIfTrue(CaptureEq(&branch)),
IsIfFalse(AllOf(CaptureEq(&branch),
IsBranch(p0, graph()->start())))))));
}
{
Reduction const r =
Reduce(graph()->NewNode(common()->Select(kMachInt32), p0, p3, p4));
ASSERT_TRUE(r.Changed());
EXPECT_THAT(r.replacement(), IsPhi(kMachInt32, p3, p4, CaptureEq(&merge)));
}
{
// We must not reuse the diamond if it is reachable from either else/then
// values of the Select, because the resulting graph can not be scheduled.
Reduction const r =
Reduce(graph()->NewNode(common()->Select(kMachInt32), p0, s0, p0));
ASSERT_TRUE(r.Changed());
EXPECT_THAT(r.replacement(),
IsPhi(kMachInt32, s0, p0, Not(CaptureEq(&merge))));
}
}
} // namespace compiler
} // namespace internal
} // namespace v8
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