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llvm_propeller_code_layout_test.cc
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llvm_propeller_code_layout_test.cc
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#include "llvm_propeller_code_layout.h"
#include <iterator>
#include <memory>
#include <optional>
#include <string>
#include <utility>
#include <vector>
#include "llvm_propeller_cfg.h"
#include "llvm_propeller_cfg_matchers.h"
#include "llvm_propeller_chain_cluster_builder.h"
#include "llvm_propeller_chain_merge_order.h"
#include "llvm_propeller_code_layout_scorer.h"
#include "llvm_propeller_function_cluster_info.h"
#include "llvm_propeller_function_cluster_info_matchers.h"
#include "llvm_propeller_mock_program_cfg_builder.h"
#include "llvm_propeller_node_chain.h"
#include "llvm_propeller_node_chain_assembly.h"
#include "llvm_propeller_node_chain_builder.h"
#include "llvm_propeller_options.pb.h"
#include "llvm_propeller_options_builder.h"
#include "llvm_propeller_program_cfg.h"
#include "llvm_propeller_statistics.h"
#include "base/logging.h"
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "third_party/abseil/absl/container/btree_map.h"
#include "third_party/abseil/absl/container/flat_hash_map.h"
#include "third_party/abseil/absl/status/statusor.h"
#include "third_party/abseil/absl/strings/str_cat.h"
#include "third_party/abseil/absl/strings/string_view.h"
#include "third_party/abseil/absl/types/span.h"
#include "util/testing/status_matchers.h"
namespace devtools_crosstool_autofdo {
namespace {
using ::testing::_;
using ::testing::Contains;
using ::testing::DescribeMatcher;
using ::testing::DoubleNear;
using ::testing::ElementsAre;
using ::testing::FieldsAre;
using ::testing::HasSubstr;
using ::testing::IsEmpty;
using ::testing::Key;
using ::testing::Matcher;
using ::testing::Pair;
using ::testing::Pointee;
using ::testing::ResultOf;
using ::testing::SizeIs;
using ::testing::UnorderedElementsAre;
using ::testing::status::IsOk;
using ::testing::status::StatusIs;
// Epsilon used to avoid double precision problem.
constexpr double kEpsilon = 0.001;
MATCHER_P(ChainIdIs, chain_id, "") { return arg->id() == chain_id; }
MATCHER_P(HasIntraChainEdges, intra_chain_out_edges_matcher,
absl::StrCat(negation ? "doesn't have" : "has",
" intra_chain_out_edges_ that ",
DescribeMatcher<std::vector<CFGEdge *>>(
intra_chain_out_edges_matcher, negation))) {
return ExplainMatchResult(intra_chain_out_edges_matcher,
arg.intra_chain_out_edges(), result_listener);
}
std::string GetTestInputPath(absl::string_view testdata_path) {
return absl::StrCat(::testing::SrcDir(), testdata_path);
}
// Helper method to capture the node ordinals in a chain/cluster and place them
// in a vector.
template <class Container>
std::vector<CFGNode::InterCfgId> GetOrderedNodeIds(const Container &container) {
std::vector<CFGNode::InterCfgId> node_ids;
container.VisitEachNodeRef(
[&](const CFGNode &n) { node_ids.push_back(n.inter_cfg_id()); });
return node_ids;
}
std::vector<CFGNode::InterCfgId> GetOrderedNodeIds(
const NodeChainAssembly &assembly) {
std::vector<CFGNode::InterCfgId> node_ids;
assembly.VisitEachNodeBundleInAssemblyOrder(
[&node_ids](const CFGNodeBundle &bundle) {
for (const CFGNode *node : bundle.nodes())
node_ids.push_back(node->inter_cfg_id());
});
return node_ids;
}
// Captures the nodes of a cfg keyed by their id.
absl::flat_hash_map<CFGNode::InterCfgId, CFGNode *> GetCfgNodes(
const ControlFlowGraph &cfg) {
absl::flat_hash_map<CFGNode::InterCfgId, CFGNode *> nodes_by_id_;
for (const std::unique_ptr<CFGNode> &node_ptr : cfg.nodes())
nodes_by_id_.emplace(node_ptr->inter_cfg_id(), node_ptr.get());
return nodes_by_id_;
}
// Creates one chain containing the given nodes.
NodeChain CreateNodeChain(absl::Span<CFGNode *const> nodes) {
CHECK(!nodes.empty());
NodeChain chain({nodes.front()},
NodeChain::BundleMode::kBundleEachSingleNode);
for (int i = 1; i < nodes.size(); ++i) {
NodeChain other_chain({nodes[i]},
NodeChain::BundleMode::kBundleEachSingleNode);
chain.MergeWith(other_chain);
}
return chain;
}
// Given a NodeChainAssembly and a CFG, returns the slice indices of all the
// CFG nodes in that assembly. The return value is a map keyed by ordinals of
// the CFG nodes mapped to their slice index in the assembly (or std::nullopt)
// if they don't occur in the assembly.
absl::flat_hash_map<CFGNode::InterCfgId, std::optional<int>> GetSliceIndices(
const NodeToBundleMapper &node_to_bundle_mapper,
const NodeChainAssembly &assembly, const ControlFlowGraph &cfg) {
absl::flat_hash_map<CFGNode::InterCfgId, std::optional<int>> slice_index_map;
for (const std::unique_ptr<CFGNode> &node : cfg.nodes()) {
const NodeToBundleMapper::BundleMappingEntry &bundle_mapping =
node_to_bundle_mapper.GetBundleMappingEntry(node.get());
slice_index_map.emplace(
node->inter_cfg_id(),
assembly.FindSliceIndex(node.get(), bundle_mapping));
}
return slice_index_map;
}
// Returns a NodeChainBuilder for CFGs with names in `cfg_names` found in
// `program_cfg`. `stats` must outlive the returned NodeChainBuilder.
// This will use the default `NodeChainAssemblyQueue` implementation for
// `node_chain_assemblies_`. Use this when the code under test does not depend
// on `NodeChainAssemblyQueue`. Otherwise, use the type-parameterized
// `NodeChainBuilderTest` to verify that the test works for every
// implementation.
NodeChainBuilder CreateNodeChainBuilderForCfgs(
const ProgramCfg &program_cfg, absl::Span<const int> function_indices,
const PropellerCodeLayoutParameters &code_layout_params,
PropellerStats::CodeLayoutStats &stats) {
const PropellerCodeLayoutScorer scorer(code_layout_params);
std::vector<const ControlFlowGraph *> cfgs;
for (int function_index : function_indices) {
cfgs.push_back(program_cfg.GetCfgByIndex(function_index));
}
return NodeChainBuilder::CreateNodeChainBuilder(scorer, cfgs,
/*initial_chains=*/{}, stats);
}
// Test the proper construction of NodeChainSlice
TEST(NodeChainSliceTest, TestCreateNodeChainSlice) {
ASSERT_OK_AND_ASSIGN(std::unique_ptr<ProtoProgramCfg> proto_program_cfg,
BuildFromCfgProtoPath(GetTestInputPath(
"/testdata/"
"propeller_three_branches.protobuf")));
const ControlFlowGraph &foo_cfg =
*proto_program_cfg->program_cfg().GetCfgByIndex(0);
EXPECT_EQ(foo_cfg.GetPrimaryName(), "foo");
absl::flat_hash_map<CFGNode::InterCfgId, CFGNode *> foo_nodes =
GetCfgNodes(foo_cfg);
NodeChain chain =
CreateNodeChain({foo_nodes.at({0, {0, 0}}), foo_nodes.at({0, {1, 0}}),
foo_nodes.at({0, {2, 0}})});
NodeChainSlice chain_slice1(chain, 0, 2);
EXPECT_EQ(chain_slice1.begin_offset(), 0);
EXPECT_EQ(chain_slice1.end_offset(), foo_nodes.at({0, {0, 0}})->size() +
foo_nodes.at({0, {1, 0}})->size());
NodeChainSlice chain_slice2(chain, 1, 3);
EXPECT_EQ(chain_slice2.begin_offset(), foo_nodes.at({0, {0, 0}})->size());
EXPECT_EQ(chain_slice2.end_offset(), chain.size());
EXPECT_EQ(chain_slice2.size(), foo_nodes.at({0, {1, 0}})->size() +
foo_nodes.at({0, {2, 0}})->size());
EXPECT_EQ(chain_slice2.end_pos(), chain.node_bundles().end());
EXPECT_EQ(chain_slice2.begin_pos(), chain.node_bundles().begin() + 1);
EXPECT_DEATH(NodeChainSlice(chain, 2, 1), HasSubstr("begin <= end"));
EXPECT_DEATH(NodeChainSlice(chain, 4, 5),
HasSubstr("begin <= chain.node_bundles().size()"));
}
TEST(CodeLayoutScorerTest, GetEdgeScore) {
ASSERT_OK_AND_ASSIGN(std::unique_ptr<ProtoProgramCfg> proto_program_cfg,
BuildFromCfgProtoPath(GetTestInputPath(
"/testdata/"
"propeller_simple_multi_function.protobuf")));
const ControlFlowGraph &foo_cfg =
*proto_program_cfg->program_cfg().GetCfgByIndex(0);
const ControlFlowGraph &bar_cfg =
*proto_program_cfg->program_cfg().GetCfgByIndex(1);
// Build a layout scorer with specific parameters.
PropellerCodeLayoutParameters params;
params.set_fallthrough_weight(10);
params.set_forward_jump_weight(2);
params.set_backward_jump_weight(1);
params.set_forward_jump_distance(200);
params.set_backward_jump_distance(100);
PropellerCodeLayoutScorer scorer(params);
ASSERT_THAT(bar_cfg.inter_edges(), SizeIs(1));
{
const auto &call_edge = bar_cfg.inter_edges().front();
ASSERT_TRUE(call_edge->IsCall());
ASSERT_NE(call_edge->weight(), 0);
ASSERT_NE(call_edge->src()->size(), 0);
// Score with negative src-to-sink distance (backward call).
// Check that for calls, half of src size is always added to the distance.
EXPECT_EQ(scorer.GetEdgeScore(*call_edge, -10),
call_edge->weight() * 1 *
(1.0 - (10 - call_edge->src()->size() / 2) / 100.0));
// Score with zero src-to-sink distance (forward call).
EXPECT_EQ(scorer.GetEdgeScore(*call_edge, 0),
call_edge->weight() * 2 *
(1.0 - (call_edge->src()->size() / 2) / 200.0));
// Score with positive src-to-sink distance (forward call).
EXPECT_EQ(scorer.GetEdgeScore(*call_edge, 20),
call_edge->weight() * 2 *
(1.0 - (20 + call_edge->src()->size() / 2) / 200.0));
// Score must be zero when beyond the src-to-sink distance exceeds the
// distance parameters.
EXPECT_EQ(scorer.GetEdgeScore(*call_edge, 250), 0);
EXPECT_EQ(scorer.GetEdgeScore(*call_edge, -150), 0);
}
ASSERT_THAT(foo_cfg.inter_edges(), SizeIs(2));
for (const std::unique_ptr<CFGEdge> &ret_edge : foo_cfg.inter_edges()) {
ASSERT_TRUE(ret_edge->IsReturn());
ASSERT_NE(ret_edge->weight(), 0);
ASSERT_NE(ret_edge->sink()->size(), 0);
// Score with negative src-to-sink distance (backward return).
// Check that for returns, half of sink size is always added to the
// distance.
EXPECT_EQ(scorer.GetEdgeScore(*ret_edge, -10),
ret_edge->weight() * 1 *
(1.0 - (10 - ret_edge->sink()->size() / 2) / 100.0));
// Score with zero src-to-sink distance (forward return).
EXPECT_EQ(scorer.GetEdgeScore(*ret_edge, 0),
ret_edge->weight() * 2 *
(1.0 - (ret_edge->sink()->size() / 2) / 200.0));
// Score with positive src-to-sink distance (forward return).
EXPECT_EQ(scorer.GetEdgeScore(*ret_edge, 20),
ret_edge->weight() * 2 *
(1.0 - (20 + ret_edge->sink()->size() / 2) / 200.0));
EXPECT_EQ(scorer.GetEdgeScore(*ret_edge, 250), 0);
EXPECT_EQ(scorer.GetEdgeScore(*ret_edge, -150), 0);
}
for (const std::unique_ptr<CFGEdge> &edge : foo_cfg.intra_edges()) {
ASSERT_EQ(edge->kind(),
devtools_crosstool_autofdo::CFGEdge::Kind::kBranchOrFallthough);
ASSERT_NE(edge->weight(), 0);
// Fallthrough score.
EXPECT_EQ(scorer.GetEdgeScore(*edge, 0), edge->weight() * 10);
// Backward edge (within distance threshold) score.
EXPECT_EQ(scorer.GetEdgeScore(*edge, -40),
edge->weight() * 1 * (1.0 - 40 / 100.0));
// Forward edge (within distance threshold) score.
EXPECT_EQ(scorer.GetEdgeScore(*edge, 80),
edge->weight() * 2 * (1.0 - 80 / 200.0));
// Forward and backward edge beyond the distance thresholds (zero score).
EXPECT_EQ(scorer.GetEdgeScore(*edge, 201), 0);
EXPECT_EQ(scorer.GetEdgeScore(*edge, -101), 0);
}
}
// Type-parameterized test fixture for `NodeChainBuilder` tests. This allows
// testing `NodeChainBuilder` with both `NodeChainAssemblyIterativeQueue` and
// and `NodeChainAssemblyBalancedTreeQueue` implementations.
template <typename NodeChainAssemblyQueueImpl>
class NodeChainBuilderTest : public testing::Test {
protected:
// Returns a `NodeChainBuilder` for CFGs with function_indexes in
// `function_indices` found in `program_cfg`. `stats` must outlive the
// returned NodeChainBuilder.
static NodeChainBuilder InitializeNodeChainBuilderForCfgs(
const ProgramCfg &program_cfg, absl::Span<const int> function_indices,
const PropellerCodeLayoutParameters &code_layout_params,
PropellerStats::CodeLayoutStats &stats) {
std::vector<const ControlFlowGraph *> cfgs;
for (int function_index : function_indices) {
cfgs.push_back(program_cfg.GetCfgByIndex(function_index));
}
return NodeChainBuilder::CreateNodeChainBuilder<NodeChainAssemblyQueueImpl>(
PropellerCodeLayoutScorer(code_layout_params), cfgs,
/*initial_chains=*/{}, stats);
}
};
using NodeChainAssemblyQueueTypes =
testing::Types<NodeChainAssemblyIterativeQueue,
NodeChainAssemblyBalancedTreeQueue>;
TYPED_TEST_SUITE(NodeChainBuilderTest, NodeChainAssemblyQueueTypes);
// Check that MergeChain(NodeChain&, NodeChain&) properly updates the chain
// edges by calling MergeChainEdges.
TYPED_TEST(NodeChainBuilderTest, MergeChainsUpdatesChainEdges) {
ASSERT_OK_AND_ASSIGN(std::unique_ptr<ProtoProgramCfg> proto_program_cfg,
BuildFromCfgProtoPath(GetTestInputPath(
"/testdata/"
"propeller_simple_conditionals_join.protobuf")));
ASSERT_THAT(proto_program_cfg->program_cfg().cfgs_by_index(),
UnorderedElementsAre(Key(10)));
PropellerStats::CodeLayoutStats stats;
NodeChainBuilder chain_builder = this->InitializeNodeChainBuilderForCfgs(
proto_program_cfg->program_cfg(), /*function_indices=*/{10},
PropellerCodeLayoutParameters(), stats);
chain_builder.InitNodeChains();
chain_builder.InitChainEdges();
const absl::flat_hash_map<CFGNode::InterCfgId, std::unique_ptr<NodeChain>>
&chains = chain_builder.chains();
EXPECT_THAT(
chains.at({10, {0, 0}})->inter_chain_out_edges(),
UnorderedElementsAre(Pair(chains.at({10, {1, 0}}).get(),
ElementsAre(Pointee(IsCfgEdge(
NodeIndexIs(0), NodeIndexIs(1), 110,
CFGEdge::Kind::kBranchOrFallthough)))),
Pair(chains.at({10, {2, 0}}).get(),
ElementsAre(Pointee(IsCfgEdge(
NodeIndexIs(0), NodeIndexIs(2), 150,
CFGEdge::Kind::kBranchOrFallthough))))));
EXPECT_THAT(chains.at({10, {0, 0}})->inter_chain_in_edges(), IsEmpty());
EXPECT_THAT(
chains.at({10, {1, 0}})->inter_chain_out_edges(),
UnorderedElementsAre(Pair(chains.at({10, {2, 0}}).get(),
ElementsAre(Pointee(IsCfgEdge(
NodeIndexIs(1), NodeIndexIs(2), 100,
CFGEdge::Kind::kBranchOrFallthough)))),
Pair(chains.at({10, {3, 0}}).get(),
ElementsAre(Pointee(IsCfgEdge(
NodeIndexIs(1), NodeIndexIs(3), 10,
CFGEdge::Kind::kBranchOrFallthough))))));
EXPECT_THAT(chains.at({10, {1, 0}})->inter_chain_in_edges(),
UnorderedElementsAre(ChainIdIs(CFGNode::InterCfgId{10, {0, 0}})));
EXPECT_THAT(
chains.at({10, {2, 0}})->inter_chain_out_edges(),
UnorderedElementsAre(Pair(chains.at({10, {4, 0}}).get(),
ElementsAre(Pointee(IsCfgEdge(
NodeIndexIs(2), NodeIndexIs(4), 250,
CFGEdge::Kind::kBranchOrFallthough))))));
EXPECT_THAT(chains.at({10, {2, 0}})->inter_chain_in_edges(),
UnorderedElementsAre(ChainIdIs(CFGNode::InterCfgId{10, {0, 0}}),
ChainIdIs(CFGNode::InterCfgId{10, {1, 0}})));
EXPECT_THAT(
chains.at({10, {3, 0}})->inter_chain_out_edges(),
UnorderedElementsAre(Pair(chains.at({10, {4, 0}}).get(),
ElementsAre(Pointee(IsCfgEdge(
NodeIndexIs(3), NodeIndexIs(4), 10,
CFGEdge::Kind::kBranchOrFallthough))))));
EXPECT_THAT(chains.at({10, {3, 0}})->inter_chain_in_edges(),
UnorderedElementsAre(ChainIdIs(CFGNode::InterCfgId{10, {1, 0}})));
EXPECT_THAT(chains.at({10, {4, 0}})->inter_chain_out_edges(), IsEmpty());
EXPECT_THAT(chains.at({10, {4, 0}})->inter_chain_in_edges(),
UnorderedElementsAre(ChainIdIs(CFGNode::InterCfgId{10, {2, 0}}),
ChainIdIs(CFGNode::InterCfgId{10, {3, 0}})));
chain_builder.MergeChains(*chains.at({10, {1, 0}}),
*chains.at(CFGNode::InterCfgId{10, {3, 0}}));
EXPECT_THAT(GetOrderedNodeIds(*chains.at({10, {1, 0}})),
ElementsAre(CFGNode::InterCfgId{10, {1, 0}},
CFGNode::InterCfgId{10, {3, 0}}));
EXPECT_THAT(
chains.at({10, {0, 0}})->inter_chain_out_edges(),
UnorderedElementsAre(Pair(chains.at({10, {1, 0}}).get(),
ElementsAre(Pointee(IsCfgEdge(
NodeIndexIs(0), NodeIndexIs(1), 110,
CFGEdge::Kind::kBranchOrFallthough)))),
Pair(chains.at({10, {2, 0}}).get(),
ElementsAre(Pointee(IsCfgEdge(
NodeIndexIs(0), NodeIndexIs(2), 150,
CFGEdge::Kind::kBranchOrFallthough))))));
EXPECT_THAT(chains.at({10, {0, 0}})->inter_chain_in_edges(), IsEmpty());
EXPECT_THAT(
chains.at({10, {1, 0}})->inter_chain_out_edges(),
UnorderedElementsAre(Pair(chains.at({10, {2, 0}}).get(),
ElementsAre(Pointee(IsCfgEdge(
NodeIndexIs(1), NodeIndexIs(2), 100,
CFGEdge::Kind::kBranchOrFallthough)))),
Pair(chains.at({10, {4, 0}}).get(),
ElementsAre(Pointee(IsCfgEdge(
NodeIndexIs(3), NodeIndexIs(4), 10,
CFGEdge::Kind::kBranchOrFallthough))))));
EXPECT_THAT(chains.at({10, {1, 0}})->node_bundles(),
ElementsAre(Pointee(HasIntraChainEdges(ElementsAre(Pointee(
IsCfgEdge(NodeIndexIs(1), NodeIndexIs(3), 10,
CFGEdge::Kind::kBranchOrFallthough))))),
Pointee(HasIntraChainEdges(IsEmpty()))));
EXPECT_THAT(chains.at({10, {1, 0}})->inter_chain_in_edges(),
UnorderedElementsAre(ChainIdIs(CFGNode::InterCfgId{10, {0, 0}})));
EXPECT_THAT(
chains.at({10, {2, 0}})->inter_chain_out_edges(),
UnorderedElementsAre(Pair(chains.at({10, {4, 0}}).get(),
ElementsAre(Pointee(IsCfgEdge(
NodeIndexIs(2), NodeIndexIs(4), 250,
CFGEdge::Kind::kBranchOrFallthough))))));
EXPECT_THAT(chains.at({10, {2, 0}})->inter_chain_in_edges(),
UnorderedElementsAre(ChainIdIs(CFGNode::InterCfgId{10, {0, 0}}),
ChainIdIs(CFGNode::InterCfgId{10, {1, 0}})));
EXPECT_THAT(chains.at({10, {4, 0}})->inter_chain_out_edges(), IsEmpty());
EXPECT_THAT(chains.at({10, {4, 0}})->inter_chain_in_edges(),
UnorderedElementsAre(ChainIdIs(CFGNode::InterCfgId{10, {1, 0}}),
ChainIdIs(CFGNode::InterCfgId{10, {2, 0}})));
}
// Check that MergeChain(NodeChainAssembly) properly updates the chain
// edges by calling MergeChainEdges.
TYPED_TEST(NodeChainBuilderTest, MergeChainsWithAssemblyUpdatesChainEdges) {
ASSERT_OK_AND_ASSIGN(std::unique_ptr<ProtoProgramCfg> proto_program_cfg,
BuildFromCfgProtoPath(GetTestInputPath(
"/testdata/"
"propeller_simple_conditionals_join.protobuf")));
ASSERT_THAT(proto_program_cfg->program_cfg().cfgs_by_index(),
UnorderedElementsAre(Key(10)));
PropellerStats::CodeLayoutStats stats;
NodeChainBuilder chain_builder = this->InitializeNodeChainBuilderForCfgs(
proto_program_cfg->program_cfg(), /*function_indices=*/{10},
PropellerCodeLayoutParameters(), stats);
chain_builder.InitNodeChains();
chain_builder.InitChainEdges();
const absl::flat_hash_map<CFGNode::InterCfgId, std::unique_ptr<NodeChain>>
&chains = chain_builder.chains();
ASSERT_THAT(chains,
UnorderedElementsAre(Key(CFGNode::InterCfgId{10, {0, 0}}),
Key(CFGNode::InterCfgId{10, {1, 0}}),
Key(CFGNode::InterCfgId{10, {2, 0}}),
Key(CFGNode::InterCfgId{10, {3, 0}}),
Key(CFGNode::InterCfgId{10, {4, 0}})));
chain_builder.MergeChains(*chains.at({10, {1, 0}}), *chains.at({10, {3, 0}}));
absl::StatusOr<NodeChainAssembly> assembly =
NodeChainAssembly::BuildNodeChainAssembly(
chain_builder.node_to_bundle_mapper(),
chain_builder.code_layout_scorer(), *chains.at({10, {1, 0}}),
*chains.at({10, {2, 0}}), {.merge_order = ChainMergeOrder::kSU});
ASSERT_OK(assembly);
chain_builder.MergeChains(*assembly);
EXPECT_THAT(GetOrderedNodeIds(*chains.at({10, {1, 0}})),
ElementsAre(CFGNode::InterCfgId{10, {1, 0}},
CFGNode::InterCfgId{10, {3, 0}},
CFGNode::InterCfgId{10, {2, 0}}));
EXPECT_THAT(
chains.at({10, {0, 0}})->inter_chain_out_edges(),
UnorderedElementsAre(
Pair(chains.at({10, {1, 0}}).get(),
ElementsAre(
Pointee(IsCfgEdge(NodeIndexIs(0), NodeIndexIs(1), 110,
CFGEdge::Kind::kBranchOrFallthough)),
Pointee(IsCfgEdge(NodeIndexIs(0), NodeIndexIs(2), 150,
CFGEdge::Kind::kBranchOrFallthough))))));
EXPECT_THAT(chains.at({10, {0, 0}})->inter_chain_in_edges(), IsEmpty());
EXPECT_THAT(
chains.at({10, {1, 0}})->inter_chain_out_edges(),
UnorderedElementsAre(
Pair(chains.at({10, {4, 0}}).get(),
ElementsAre(
Pointee(IsCfgEdge(NodeIndexIs(3), NodeIndexIs(4), 10,
CFGEdge::Kind::kBranchOrFallthough)),
Pointee(IsCfgEdge(NodeIndexIs(2), NodeIndexIs(4), 250,
CFGEdge::Kind::kBranchOrFallthough))))));
EXPECT_THAT(
chains.at({10, {1, 0}})->node_bundles(),
ElementsAre(Pointee(HasIntraChainEdges(ElementsAre(
Pointee(IsCfgEdge(NodeIndexIs(1), NodeIndexIs(3), 10,
CFGEdge::Kind::kBranchOrFallthough)),
Pointee(IsCfgEdge(NodeIndexIs(1), NodeIndexIs(2), 100,
CFGEdge::Kind::kBranchOrFallthough))))),
Pointee(HasIntraChainEdges(IsEmpty())),
Pointee(HasIntraChainEdges(IsEmpty()))));
EXPECT_THAT(chains.at({10, {1, 0}})->inter_chain_in_edges(),
UnorderedElementsAre(ChainIdIs(CFGNode::InterCfgId{10, {0, 0}})));
EXPECT_THAT(chains.at({10, {4, 0}})->inter_chain_out_edges(), IsEmpty());
EXPECT_THAT(chains.at({10, {4, 0}})->inter_chain_in_edges(),
UnorderedElementsAre(ChainIdIs(CFGNode::InterCfgId{10, {1, 0}})));
}
// Test GetForcedPaths and its two separate steps (GetForcedEdges and
// BreakCycles) in a CFG with a loop.
TEST(CodeLayoutTest, GetForcedPathsWithLoop) {
ASSERT_OK_AND_ASSIGN(std::unique_ptr<ProtoProgramCfg> proto_program_cfg,
BuildFromCfgProtoPath(GetTestInputPath(
"/testdata/"
"propeller_loop_no_entry_no_exit.protobuf")));
ASSERT_THAT(proto_program_cfg->program_cfg().cfgs_by_index(),
UnorderedElementsAre(Key(0)));
const ControlFlowGraph &foo_cfg =
*proto_program_cfg->program_cfg().GetCfgByIndex(0);
EXPECT_THAT(GetForcedPaths(foo_cfg),
ElementsAre(ElementsAre(Pointee(NodeIndexIs(1)),
Pointee(NodeIndexIs(2)))));
absl::btree_map<const CFGNode *, const CFGNode *, CFGNodePtrComparator>
forced_edges = GetForcedEdges(foo_cfg);
EXPECT_THAT(forced_edges,
UnorderedElementsAre(
Pair(Pointee(NodeIndexIs(1)), Pointee(NodeIndexIs(2))),
Pair(Pointee(NodeIndexIs(2)), Pointee(NodeIndexIs(1)))));
BreakCycles(forced_edges);
EXPECT_THAT(forced_edges,
UnorderedElementsAre(
Pair(Pointee(NodeIndexIs(1)), Pointee(NodeIndexIs(2)))));
}
// Test GetForcedPaths and its two separate steps (GetForcedEdges and
// BreakCycles) in a CFG without a loop.
TEST(CodeLayoutTest, GetForcedPathsNoLoop) {
ASSERT_OK_AND_ASSIGN(std::unique_ptr<ProtoProgramCfg> proto_program_cfg,
BuildFromCfgProtoPath(GetTestInputPath(
"/testdata/"
"propeller_three_branches.protobuf")));
ASSERT_THAT(proto_program_cfg->program_cfg().cfgs_by_index(),
UnorderedElementsAre(Key(0)));
const ControlFlowGraph &foo_cfg =
*proto_program_cfg->program_cfg().GetCfgByIndex(0);
EXPECT_THAT(GetForcedPaths(foo_cfg),
ElementsAre(ElementsAre(NodeIndexIs(0), NodeIndexIs(1)),
ElementsAre(NodeIndexIs(2), NodeIndexIs(3))));
absl::btree_map<const CFGNode *, const CFGNode *, CFGNodePtrComparator>
forced_edges = GetForcedEdges(foo_cfg);
EXPECT_THAT(forced_edges,
UnorderedElementsAre(
Pair(Pointee(NodeIndexIs(0)), Pointee(NodeIndexIs(1))),
Pair(Pointee(NodeIndexIs(2)), Pointee(NodeIndexIs(3)))));
BreakCycles(forced_edges);
EXPECT_THAT(forced_edges,
UnorderedElementsAre(
Pair(Pointee(NodeIndexIs(0)), Pointee(NodeIndexIs(1))),
Pair(Pointee(NodeIndexIs(2)), Pointee(NodeIndexIs(3)))));
}
TYPED_TEST(NodeChainBuilderTest, InitNodeChainsCreatesBundlesForLoop) {
ASSERT_OK_AND_ASSIGN(std::unique_ptr<ProtoProgramCfg> proto_program_cfg,
BuildFromCfgProtoPath(GetTestInputPath(
"/testdata/"
"propeller_loop_no_entry_no_exit.protobuf")));
ASSERT_THAT(proto_program_cfg->program_cfg().cfgs_by_index(),
UnorderedElementsAre(Key(0)));
PropellerStats::CodeLayoutStats stats;
NodeChainBuilder chain_builder = this->InitializeNodeChainBuilderForCfgs(
proto_program_cfg->program_cfg(), /*function_indices=*/{0},
PropellerCodeLayoutParameters(), stats);
chain_builder.InitNodeChains();
// Verify the initial chains.
EXPECT_THAT(
chain_builder.chains(),
UnorderedElementsAre(
Pair(CFGNode::InterCfgId{0, {0, 0}},
Pointee(ResultOf(&GetOrderedNodeIds<NodeChain>,
ElementsAre(CFGNode::InterCfgId{0, {0, 0}})))),
Pair(
CFGNode::InterCfgId{0, {1, 0}},
Pointee(ResultOf(&GetOrderedNodeIds<NodeChain>,
ElementsAre(CFGNode::InterCfgId{0, {1, 0}},
CFGNode::InterCfgId{0, {2, 0}}))))));
}
// This tests every step in NodeChainBuilder::BuildChains on a single CFG.
TYPED_TEST(NodeChainBuilderTest, BuildChainsSingleCfgInternal) {
ASSERT_OK_AND_ASSIGN(std::unique_ptr<ProtoProgramCfg> proto_program_cfg,
BuildFromCfgProtoPath(GetTestInputPath(
"/testdata/"
"propeller_three_branches.protobuf")));
ASSERT_THAT(proto_program_cfg->program_cfg().cfgs_by_index(),
UnorderedElementsAre(Key(0)));
const ControlFlowGraph &foo_cfg =
*proto_program_cfg->program_cfg().GetCfgByIndex(0);
ASSERT_THAT(foo_cfg.nodes(), SizeIs(6));
PropellerStats::CodeLayoutStats stats;
NodeChainBuilder chain_builder = this->InitializeNodeChainBuilderForCfgs(
proto_program_cfg->program_cfg(), /*function_indices=*/{0},
PropellerCodeLayoutParameters(), stats);
chain_builder.InitNodeChains();
const auto &chains = chain_builder.chains();
// Verify the initial chains to make sure bundles are created.
EXPECT_THAT(
chains,
UnorderedElementsAre(
Pair(CFGNode::InterCfgId{0, {0, 0}},
Pointee(ResultOf(&GetOrderedNodeIds<NodeChain>,
ElementsAre(CFGNode::InterCfgId{0, {0, 0}},
CFGNode::InterCfgId{0, {1, 0}})))),
Pair(CFGNode::InterCfgId{0, {2, 0}},
Pointee(ResultOf(&GetOrderedNodeIds<NodeChain>,
ElementsAre(CFGNode::InterCfgId{0, {2, 0}},
CFGNode::InterCfgId{0, {3, 0}})))),
Pair(CFGNode::InterCfgId{0, {4, 0}},
Pointee(ResultOf(&GetOrderedNodeIds<NodeChain>,
ElementsAre(CFGNode::InterCfgId{0, {4, 0}})))),
Pair(
CFGNode::InterCfgId{0, {5, 0}},
Pointee(ResultOf(&GetOrderedNodeIds<NodeChain>,
ElementsAre(CFGNode::InterCfgId{0, {5, 0}}))))));
chain_builder.InitChainEdges();
// Verify the number of in edges and out edges of every chain.
struct {
CFGNode::InterCfgId chain_id;
int inter_chain_out_edges_count;
int inter_chain_in_edges_count;
} expected_edge_counts[] = {{{0, {0, 0}}, 2, 0},
{{0, {2, 0}}, 0, 0},
{{0, {4, 0}}, 0, 1},
{{0, {5, 0}}, 0, 1}};
for (const auto &chain_edge_count : expected_edge_counts) {
EXPECT_EQ(
chains.at(chain_edge_count.chain_id)->inter_chain_out_edges().size(),
chain_edge_count.inter_chain_out_edges_count);
EXPECT_EQ(
chains.at(chain_edge_count.chain_id)->inter_chain_in_edges().size(),
chain_edge_count.inter_chain_in_edges_count);
}
chain_builder.InitChainAssemblies();
int merge_chain_count = 0;
while (!chain_builder.node_chain_assemblies().empty()) {
chain_builder.MergeChains(
chain_builder.node_chain_assemblies().GetBestAssembly());
++merge_chain_count;
}
EXPECT_EQ(merge_chain_count, 2);
// Verify that the chain assemblies is empty now.
EXPECT_TRUE(chain_builder.node_chain_assemblies().empty());
// Verify the constructed chains.
EXPECT_THAT(
chains,
UnorderedElementsAre(
Pair(CFGNode::InterCfgId{0, {0, 0}},
Pointee(ResultOf(&GetOrderedNodeIds<NodeChain>,
ElementsAre(CFGNode::InterCfgId{0, {0, 0}},
CFGNode::InterCfgId{0, {1, 0}},
CFGNode::InterCfgId{0, {4, 0}},
CFGNode::InterCfgId{0, {5, 0}})))),
Pair(
CFGNode::InterCfgId{0, {2, 0}},
Pointee(ResultOf(&GetOrderedNodeIds<NodeChain>,
ElementsAre(CFGNode::InterCfgId{0, {2, 0}},
CFGNode::InterCfgId{0, {3, 0}}))))));
chain_builder.CoalesceChains();
// Verify that the two chains are coalesced together.
EXPECT_THAT(
chains,
UnorderedElementsAre(Pair(
CFGNode::InterCfgId{0, {0, 0}},
Pointee(ResultOf(&GetOrderedNodeIds<NodeChain>,
ElementsAre(CFGNode::InterCfgId{0, {0, 0}},
CFGNode::InterCfgId{0, {1, 0}},
CFGNode::InterCfgId{0, {4, 0}},
CFGNode::InterCfgId{0, {5, 0}},
CFGNode::InterCfgId{0, {2, 0}},
CFGNode::InterCfgId{0, {3, 0}}))))));
}
// This tests NodeChainBuilder::BuildChains on multiple CFGs (with
// inter-procedural layout).
TYPED_TEST(NodeChainBuilderTest, BuildChainsMultipleCfgsInterFunction) {
ASSERT_OK_AND_ASSIGN(std::unique_ptr<ProtoProgramCfg> proto_program_cfg,
BuildFromCfgProtoPath(GetTestInputPath(
"/testdata/"
"propeller_simple_multi_function.protobuf")));
ASSERT_THAT(proto_program_cfg->program_cfg().cfgs_by_index(),
UnorderedElementsAre(Key(0), Key(1), Key(4), Key(100)));
PropellerStats::CodeLayoutStats stats;
NodeChainBuilder chain_builder = this->InitializeNodeChainBuilderForCfgs(
proto_program_cfg->program_cfg(),
/*function_indices=*/{0, 1, 4, 100},
PropellerCodeLayoutParametersBuilder().SetInterFunctionReordering(true),
stats);
// Verify the constructed chains.
EXPECT_THAT(
chain_builder.BuildChains(),
UnorderedElementsAre(
Pointee(ResultOf(&GetOrderedNodeIds<NodeChain>,
ElementsAre(CFGNode::InterCfgId{1, {0, 0}},
CFGNode::InterCfgId{1, {1, 0}},
CFGNode::InterCfgId{1, {3, 0}},
CFGNode::InterCfgId{0, {0, 0}},
CFGNode::InterCfgId{0, {2, 0}},
CFGNode::InterCfgId{0, {1, 0}}))),
Pointee(ResultOf(&GetOrderedNodeIds<NodeChain>,
ElementsAre(CFGNode::InterCfgId{1, {2, 0}},
CFGNode::InterCfgId{1, {4, 0}}))),
Pointee(ResultOf(&GetOrderedNodeIds<NodeChain>,
ElementsAre(CFGNode::InterCfgId{100, {0, 0}})))));
}
struct ChainBuilderSplitThresholdTestCase {
std::string test_name;
std::vector<int> function_indices;
int chain_split_threshold;
// Matcher for `node_bundles()` of the single `NodeChain` built.
testing::Matcher<std::vector<std::unique_ptr<CFGNodeBundle>>> bundles_matcher;
};
using ChainBuilderSplitThresholdTest =
::testing::TestWithParam<ChainBuilderSplitThresholdTestCase>;
TEST_P(ChainBuilderSplitThresholdTest, BuildChains) {
const ChainBuilderSplitThresholdTestCase &test_case = GetParam();
ASSERT_OK_AND_ASSIGN(std::unique_ptr<ProtoProgramCfg> proto_program_cfg,
BuildFromCfgProtoPath(GetTestInputPath(
"/testdata/"
"propeller_call_from_simple_loop.protobuf")));
ASSERT_THAT(proto_program_cfg->program_cfg().cfgs_by_index(),
UnorderedElementsAre(Key(1), Key(2), Key(3)));
PropellerStats::CodeLayoutStats stats;
EXPECT_THAT(CreateNodeChainBuilderForCfgs(
proto_program_cfg->program_cfg(), test_case.function_indices,
PropellerCodeLayoutParametersBuilder()
.SetInterFunctionReordering(true)
.SetChainSplitThreshold(test_case.chain_split_threshold)
.SetChainSplit(true),
stats)
.BuildChains(),
UnorderedElementsAre(Pointee(Property(
&NodeChain::node_bundles, test_case.bundles_matcher))));
}
INSTANTIATE_TEST_SUITE_P(
ChainBuilderSplitThresholdTests, ChainBuilderSplitThresholdTest,
testing::ValuesIn<ChainBuilderSplitThresholdTestCase>(
{{.test_name = "Rebundles1",
.function_indices = {1, 2},
.chain_split_threshold = 2,
.bundles_matcher = ElementsAre(
Pointee(ResultOf(&GetOrderedNodeIds<CFGNodeBundle>,
ElementsAre(CFGNode::InterCfgId{1, {0, 0}},
CFGNode::InterCfgId{1, {1, 0}},
CFGNode::InterCfgId{1, {2, 0}}))),
Pointee(ResultOf(&GetOrderedNodeIds<CFGNodeBundle>,
ElementsAre(CFGNode::InterCfgId{2, {0, 0}}))))},
{.test_name = "Rebundles2",
.function_indices = {1, 2, 3},
.chain_split_threshold = 3,
.bundles_matcher = ElementsAre(
Pointee(ResultOf(&GetOrderedNodeIds<CFGNodeBundle>,
ElementsAre(CFGNode::InterCfgId{3, {0, 0}}))),
Pointee(ResultOf(&GetOrderedNodeIds<CFGNodeBundle>,
ElementsAre(CFGNode::InterCfgId{1, {0, 0}},
CFGNode::InterCfgId{1, {1, 0}},
CFGNode::InterCfgId{1, {2, 0}}))),
Pointee(ResultOf(&GetOrderedNodeIds<CFGNodeBundle>,
ElementsAre(CFGNode::InterCfgId{2, {0, 0}}))))},
{.test_name = "DoesNotRebundle1",
.function_indices = {1, 2},
.chain_split_threshold = 3,
.bundles_matcher = ElementsAre(
Pointee(ResultOf(&GetOrderedNodeIds<CFGNodeBundle>,
ElementsAre(CFGNode::InterCfgId{1, {0, 0}}))),
Pointee(ResultOf(&GetOrderedNodeIds<CFGNodeBundle>,
ElementsAre(CFGNode::InterCfgId{1, {1, 0}},
CFGNode::InterCfgId{1, {2, 0}}))),
Pointee(ResultOf(&GetOrderedNodeIds<CFGNodeBundle>,
ElementsAre(CFGNode::InterCfgId{2, {0, 0}}))))},
{.test_name = "DoesNotRebundle2",
.function_indices = {1, 2},
.chain_split_threshold = 4,
.bundles_matcher = ElementsAre(
Pointee(ResultOf(&GetOrderedNodeIds<CFGNodeBundle>,
ElementsAre(CFGNode::InterCfgId{1, {0, 0}}))),
Pointee(ResultOf(&GetOrderedNodeIds<CFGNodeBundle>,
ElementsAre(CFGNode::InterCfgId{1, {1, 0}},
CFGNode::InterCfgId{1, {2, 0}}))),
Pointee(ResultOf(&GetOrderedNodeIds<CFGNodeBundle>,
ElementsAre(CFGNode::InterCfgId{2, {0, 0}}))))},
{.test_name = "DoesNotRebundle3",
.function_indices = {1, 2, 3},
.chain_split_threshold = 4,
.bundles_matcher = ElementsAre(
Pointee(ResultOf(&GetOrderedNodeIds<CFGNodeBundle>,
ElementsAre(CFGNode::InterCfgId{3, {0, 0}}))),
Pointee(ResultOf(&GetOrderedNodeIds<CFGNodeBundle>,
ElementsAre(CFGNode::InterCfgId{1, {0, 0}}))),
Pointee(ResultOf(&GetOrderedNodeIds<CFGNodeBundle>,
ElementsAre(CFGNode::InterCfgId{1, {1, 0}},
CFGNode::InterCfgId{1, {2, 0}}))),
Pointee(ResultOf(&GetOrderedNodeIds<CFGNodeBundle>,
ElementsAre(CFGNode::InterCfgId{2,
{0, 0}}))))}}),
[](const testing::TestParamInfo<ChainBuilderSplitThresholdTest::ParamType>
&info) { return info.param.test_name; });
// This tests NodeChainBuilder::BuildChains on a single CFG (with
// non-inter-procedural layout).
TYPED_TEST(NodeChainBuilderTest, BuildChainsSingleCfg) {
ASSERT_OK_AND_ASSIGN(std::unique_ptr<ProtoProgramCfg> proto_program_cfg,
BuildFromCfgProtoPath(GetTestInputPath(
"/testdata/"
"propeller_simple_multi_function.protobuf")));
ASSERT_THAT(proto_program_cfg->program_cfg().cfgs_by_index(),
UnorderedElementsAre(Key(0), Key(1), Key(4), Key(100)));
PropellerStats::CodeLayoutStats stats;
NodeChainBuilder chain_builder = this->InitializeNodeChainBuilderForCfgs(
proto_program_cfg->program_cfg(), /*function_indices=*/{1},
PropellerCodeLayoutParameters(), stats);
// Verify the constructed chains.
EXPECT_THAT(
chain_builder.BuildChains(),
UnorderedElementsAre(Pointee(ResultOf(
&GetOrderedNodeIds<NodeChain>,
ElementsAre(
CFGNode::InterCfgId{1, {0, 0}}, CFGNode::InterCfgId{1, {1, 0}},
CFGNode::InterCfgId{1, {3, 0}}, CFGNode::InterCfgId{1, {2, 0}},
CFGNode::InterCfgId{1, {4, 0}})))));
}
TYPED_TEST(NodeChainBuilderTest, LargeBlocksPreventMerge) {
ASSERT_OK_AND_ASSIGN(std::unique_ptr<ProtoProgramCfg> proto_program_cfg,
BuildFromCfgProtoPath(GetTestInputPath(
"/testdata/"
"propeller_two_large_blocks.protobuf")));
ASSERT_THAT(proto_program_cfg->program_cfg().cfgs_by_index(),
UnorderedElementsAre(Key(0), Key(1)));
PropellerStats::CodeLayoutStats stats;
NodeChainBuilder chain_builder = this->InitializeNodeChainBuilderForCfgs(
proto_program_cfg->program_cfg(), /*function_indices=*/{0, 1},
// Use inter-function-reordering to disable coalescing.
PropellerCodeLayoutParametersBuilder().SetInterFunctionReordering(true),
stats);
// Verify the constructed chains. 4 will not be merged with 1,2,3 because 1
// and 3 are so large that the 2->4 edge provides no score gain.
EXPECT_THAT(
chain_builder.BuildChains(),
UnorderedElementsAre(
Pointee(ResultOf(&GetOrderedNodeIds<NodeChain>,
ElementsAre(CFGNode::InterCfgId{0, {0, 0}},
CFGNode::InterCfgId{0, {1, 0}},
CFGNode::InterCfgId{0, {2, 0}}))),
Pointee(ResultOf(&GetOrderedNodeIds<NodeChain>,
ElementsAre(CFGNode::InterCfgId{0, {3, 0}},
CFGNode::InterCfgId{1, {0, 0}})))));
}
// Tests building and applying a SU NodeChainAssembly.
TEST(NodeChainAssemblyTest, ApplySUChainMergeOrder) {
ASSERT_OK_AND_ASSIGN(std::unique_ptr<ProtoProgramCfg> proto_program_cfg,
BuildFromCfgProtoPath(GetTestInputPath(
"/testdata/"
"propeller_simple_conditionals_join.protobuf")));
ASSERT_THAT(proto_program_cfg->program_cfg().cfgs_by_index(),
UnorderedElementsAre(Key(10)));
PropellerStats::CodeLayoutStats stats;
NodeChainBuilder chain_builder = CreateNodeChainBuilderForCfgs(
proto_program_cfg->program_cfg(), /*function_indices=*/{10},
PropellerCodeLayoutParameters(), stats);
chain_builder.InitNodeChains();
chain_builder.InitChainEdges();
const absl::flat_hash_map<CFGNode::InterCfgId, std::unique_ptr<NodeChain>>
&chains = chain_builder.chains();
ASSERT_THAT(chains,
UnorderedElementsAre(Key(CFGNode::InterCfgId{10, {0, 0}}),
Key(CFGNode::InterCfgId{10, {1, 0}}),
Key(CFGNode::InterCfgId{10, {2, 0}}),
Key(CFGNode::InterCfgId{10, {3, 0}}),
Key(CFGNode::InterCfgId{10, {4, 0}})));
ASSERT_OK_AND_ASSIGN(
NodeChainAssembly assembly,
NodeChainAssembly::BuildNodeChainAssembly(
chain_builder.node_to_bundle_mapper(),
chain_builder.code_layout_scorer(), *chains.at({10, {0, 0}}),
*chains.at({10, {2, 0}}), {.merge_order = ChainMergeOrder::kSU}));
EXPECT_THAT(assembly.score_gain(), DoubleNear(1500, kEpsilon));
EXPECT_THAT(GetSliceIndices(chain_builder.node_to_bundle_mapper(), assembly,
*chain_builder.cfgs().front()),
UnorderedElementsAre(
Pair(CFGNode::InterCfgId{10, {0, 0}}, 0),
Pair(CFGNode::InterCfgId{10, {2, 0}}, 1),
Pair(CFGNode::InterCfgId{10, {1, 0}}, std::nullopt),
Pair(CFGNode::InterCfgId{10, {3, 0}}, std::nullopt),
Pair(CFGNode::InterCfgId{10, {4, 0}}, std::nullopt)));
EXPECT_THAT(GetOrderedNodeIds(assembly),
ElementsAre(CFGNode::InterCfgId{10, {0, 0}},
CFGNode::InterCfgId{10, {2, 0}}));
chain_builder.MergeChains(assembly);
EXPECT_THAT(GetOrderedNodeIds(*chains.at({10, {0, 0}})),
ElementsAre(CFGNode::InterCfgId{10, {0, 0}},
CFGNode::InterCfgId{10, {2, 0}}));
EXPECT_THAT(chains,
UnorderedElementsAre(Key(CFGNode::InterCfgId{10, {0, 0}}),
Key(CFGNode::InterCfgId{10, {1, 0}}),
Key(CFGNode::InterCfgId{10, {3, 0}}),
Key(CFGNode::InterCfgId{10, {4, 0}})));
}
// Tests building and applying a S1US2 NodeChainAssembly.
TEST(NodeChainAssemblyTest, ApplyS1US2ChainMergeOrder) {
ASSERT_OK_AND_ASSIGN(std::unique_ptr<ProtoProgramCfg> proto_program_cfg,
BuildFromCfgProtoPath(GetTestInputPath(
"/testdata/"
"propeller_simple_conditionals_join.protobuf")));
ASSERT_THAT(proto_program_cfg->program_cfg().cfgs_by_index(),
UnorderedElementsAre(Key(10)));
PropellerStats::CodeLayoutStats stats;
NodeChainBuilder chain_builder = CreateNodeChainBuilderForCfgs(
proto_program_cfg->program_cfg(), /*function_indices=*/{10},
PropellerCodeLayoutParameters(), stats);
chain_builder.InitNodeChains();
chain_builder.InitChainEdges();
const absl::flat_hash_map<CFGNode::InterCfgId, std::unique_ptr<NodeChain>>
&chains = chain_builder.chains();
ASSERT_THAT(chains,
UnorderedElementsAre(Key(CFGNode::InterCfgId{10, {0, 0}}),
Key(CFGNode::InterCfgId{10, {1, 0}}),
Key(CFGNode::InterCfgId{10, {2, 0}}),
Key(CFGNode::InterCfgId{10, {3, 0}}),
Key(CFGNode::InterCfgId{10, {4, 0}})));
chain_builder.MergeChains(*chains.at({10, {0, 0}}), *chains.at({10, {2, 0}}));
EXPECT_THAT(chains,
UnorderedElementsAre(Key(CFGNode::InterCfgId{10, {0, 0}}),
Key(CFGNode::InterCfgId{10, {1, 0}}),
Key(CFGNode::InterCfgId{10, {3, 0}}),
Key(CFGNode::InterCfgId{10, {4, 0}})));
EXPECT_THAT(GetOrderedNodeIds(*chains.at({10, {0, 0}})),
ElementsAre(CFGNode::InterCfgId{10, {0, 0}},
CFGNode::InterCfgId{10, {2, 0}}));
ASSERT_OK_AND_ASSIGN(
NodeChainAssembly assembly,
NodeChainAssembly::BuildNodeChainAssembly(
chain_builder.node_to_bundle_mapper(),
chain_builder.code_layout_scorer(), *chains.at({10, {0, 0}}),
*chains.at({10, {1, 0}}),
{.merge_order = ChainMergeOrder::kS1US2, .slice_pos = 1}));
EXPECT_THAT(GetSliceIndices(chain_builder.node_to_bundle_mapper(), assembly,
*chain_builder.cfgs().front()),
UnorderedElementsAre(
Pair(CFGNode::InterCfgId{10, {0, 0}}, 0),
Pair(CFGNode::InterCfgId{10, {1, 0}}, 1),
Pair(CFGNode::InterCfgId{10, {2, 0}}, 2),
Pair(CFGNode::InterCfgId{10, {3, 0}}, std::nullopt),
Pair(CFGNode::InterCfgId{10, {4, 0}}, std::nullopt)));
EXPECT_THAT(assembly.score_gain(), DoubleNear(749.414, kEpsilon));
EXPECT_THAT(GetOrderedNodeIds(assembly),
ElementsAre(CFGNode::InterCfgId{10, {0, 0}},
CFGNode::InterCfgId{10, {1, 0}},
CFGNode::InterCfgId{10, {2, 0}}));
chain_builder.MergeChains(assembly);
EXPECT_THAT(GetOrderedNodeIds(*chains.at({10, {0, 0}})),
ElementsAre(CFGNode::InterCfgId{10, {0, 0}},
CFGNode::InterCfgId{10, {1, 0}},
CFGNode::InterCfgId{10, {2, 0}}));
EXPECT_THAT(chains,
UnorderedElementsAre(Key(CFGNode::InterCfgId{10, {0, 0}}),
Key(CFGNode::InterCfgId{10, {3, 0}}),
Key(CFGNode::InterCfgId{10, {4, 0}})));
}
// Test for building and applying a US2S1 NodeChainAssembly.
TEST(NodeChainAssemblyTest, ApplyUS2S1ChainMergeOrder) {
ASSERT_OK_AND_ASSIGN(std::unique_ptr<ProtoProgramCfg> proto_program_cfg,
BuildFromCfgProtoPath(GetTestInputPath(
"/testdata/"
"propeller_simple_conditionals_join.protobuf")));
ASSERT_THAT(proto_program_cfg->program_cfg().cfgs_by_index(),
UnorderedElementsAre(Key(10)));
PropellerStats::CodeLayoutStats stats;
NodeChainBuilder chain_builder = CreateNodeChainBuilderForCfgs(
proto_program_cfg->program_cfg(), /*function_indices=*/{10},
PropellerCodeLayoutParameters(), stats);
chain_builder.InitNodeChains();
chain_builder.InitChainEdges();
const absl::flat_hash_map<CFGNode::InterCfgId, std::unique_ptr<NodeChain>>
&chains = chain_builder.chains();
ASSERT_THAT(chains,
UnorderedElementsAre(Key(CFGNode::InterCfgId{10, {0, 0}}),
Key(CFGNode::InterCfgId{10, {1, 0}}),
Key(CFGNode::InterCfgId{10, {2, 0}}),
Key(CFGNode::InterCfgId{10, {3, 0}}),
Key(CFGNode::InterCfgId{10, {4, 0}})));