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Add dyno stats for jump tables.

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Summary: Add dyno stats for jump tables.

(cherry picked from FBD3871035)
This commit is contained in:
Maksim Panchenko
2016-09-15 10:24:22 -07:00
parent 2f3a859772
commit 8dbf0e2b3d
2 changed files with 20 additions and 3 deletions
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22
bolt/BinaryFunction.cpp
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@@ -1364,7 +1364,7 @@ void BinaryFunction::inferFallThroughCounts() {
// Calculate frequency of outgoing branches from this node according to
// LBR data
uint64_t ReportedBranches = 0;
for (auto &SuccCount : CurBB->branch_info()) {
for (const auto &SuccCount : CurBB->branch_info()) {
if (SuccCount.Count != BinaryBasicBlock::COUNT_FALLTHROUGH_EDGE)
ReportedBranches += SuccCount.Count;
}
@@ -2680,8 +2680,8 @@ DynoStats BinaryFunction::getDynoStats() const {
if (BI.Count != BinaryBasicBlock::COUNT_NO_PROFILE)
BBExecutionCount += BI.Count;
// Ignore blocks that were not executed.
if (BBExecutionCount == 0)
// Ignore empty blocks and blocks that were not executed.
if (BB->getNumNonPseudos() == 0 || BBExecutionCount == 0)
continue;
// Count the number of calls by iterating through all instructions.
@@ -2696,6 +2696,22 @@ DynoStats BinaryFunction::getDynoStats() const {
Stats[DynoStats::INSTRUCTIONS] += BB->getNumNonPseudos() * BBExecutionCount;
// Jump tables.
const auto *LastInstr = BB->findLastNonPseudoInstruction();
if (BC.MIA->getJumpTableIndex(*LastInstr) > 0) {
Stats[DynoStats::JUMP_TABLE_BRANCHES] += BBExecutionCount;
DEBUG(
static uint64_t MostFrequentJT;
if (BBExecutionCount > MostFrequentJT) {
MostFrequentJT = BBExecutionCount;
dbgs() << "BOLT-INFO: most frequently executed jump table is in "
<< "function " << *this << " in basic block " << BB->getName()
<< " executed totally " << BBExecutionCount << " times.\n";
}
);
continue;
}
// Update stats for branches.
const MCSymbol *TBB = nullptr;
const MCSymbol *FBB = nullptr;