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MergeFunctions Pass, introduced sanity check, that checks order relation,

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introduced among functions set.
    
This patch belongs to patch series that improves MergeFunctions
performance time from O(N*N) to O(N*log(N)).



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211442 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Stepan Dyatkovskiy 2014-06-21 18:58:11 +00:00
parent 23a7bfce97
commit e298b1ce98
1 changed files with 88 additions and 0 deletions
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88
lib/Transforms/IPO/MergeFunctions.cpp
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@ -60,6 +60,7 @@
#include "llvm/IR/Operator.h"
#include "llvm/IR/ValueHandle.h"
#include "llvm/Pass.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
@ -73,6 +74,13 @@ STATISTIC(NumThunksWritten, "Number of thunks generated");
STATISTIC(NumAliasesWritten, "Number of aliases generated");
STATISTIC(NumDoubleWeak, "Number of new functions created");
static cl::opt<unsigned> NumFunctionsForSanityCheck(
"mergefunc-sanity",
cl::desc("How many functions in module could be used for "
"MergeFunctions pass sanity check. "
"'0' disables this check. Works only with '-debug' key."),
cl::init(0), cl::Hidden);
/// Returns the type id for a type to be hashed. We turn pointer types into
/// integers here because the actual compare logic below considers pointers and
/// integers of the same size as equal.
@ -1121,6 +1129,10 @@ private:
/// analyzed again.
std::vector<WeakVH> Deferred;
/// Checks the rules of order relation introduced among functions set.
/// Returns true, if sanity check has been passed, and false if failed.
bool doSanityCheck(std::vector<WeakVH> &Worklist);
/// Insert a ComparableFunction into the FnSet, or merge it away if it's
/// equal to one that's already present.
bool insert(ComparableFunction &NewF);
@ -1172,6 +1184,80 @@ ModulePass *llvm::createMergeFunctionsPass() {
return new MergeFunctions();
}
bool MergeFunctions::doSanityCheck(std::vector<WeakVH> &Worklist) {
if (const unsigned Max = NumFunctionsForSanityCheck) {
unsigned TripleNumber = 0;
bool Valid = true;
dbgs() << "MERGEFUNC-SANITY: Started for first " << Max << " functions.\n";
unsigned i = 0;
for (std::vector<WeakVH>::iterator I = Worklist.begin(), E = Worklist.end();
I != E && i < Max; ++I, ++i) {
unsigned j = i;
for (std::vector<WeakVH>::iterator J = I; J != E && j < Max; ++J, ++j) {
Function *F1 = cast<Function>(*I);
Function *F2 = cast<Function>(*J);
int Res1 = FunctionComparator(DL, F1, F2).compare();
int Res2 = FunctionComparator(DL, F2, F1).compare();
// If F1 <= F2, then F2 >= F1, otherwise report failure.
if (Res1 != -Res2) {
dbgs() << "MERGEFUNC-SANITY: Non-symmetric; triple: " << TripleNumber
<< "\n";
F1->dump();
F2->dump();
Valid = false;
}
if (Res1 == 0)
continue;
unsigned k = j;
for (std::vector<WeakVH>::iterator K = J; K != E && k < Max;
++k, ++K, ++TripleNumber) {
if (K == J)
continue;
Function *F3 = cast<Function>(*K);
int Res3 = FunctionComparator(DL, F1, F3).compare();
int Res4 = FunctionComparator(DL, F2, F3).compare();
bool Transitive = true;
// F1 > F2, F2 > F3 => F1 > F3
if (Res1 != 0 && Res1 == Res4) {
Transitive = Res3 == Res1;
} else
// F1 > F3, F3 > F2 => F1 > F2
if (Res3 != 0 && Res3 == -Res4) {
Transitive = Res3 == Res1;
} else
// F2 > F3, F3 > F1 => F2 > F1
if (Res4 != 0 && -Res3 == Res4) {
Transitive = Res4 == -Res1;
}
if (!Transitive) {
dbgs() << "MERGEFUNC-SANITY: Non-transitive; triple: "
<< TripleNumber << "\n";
dbgs() << "Res1, Res3, Res4: " << Res1 << ", " << Res3 << ", "
<< Res4 << "\n";
F1->dump();
F2->dump();
F3->dump();
Valid = false;
}
}
}
}
dbgs() << "MERGEFUNC-SANITY: " << (Valid ? "Passed." : "Failed.") << "\n";
return Valid;
}
return true;
}
bool MergeFunctions::runOnModule(Module &M) {
bool Changed = false;
DataLayoutPass *DLP = getAnalysisIfAvailable<DataLayoutPass>();
@ -1187,6 +1273,8 @@ bool MergeFunctions::runOnModule(Module &M) {
std::vector<WeakVH> Worklist;
Deferred.swap(Worklist);
DEBUG(doSanityCheck(Worklist));
DEBUG(dbgs() << "size of module: " << M.size() << '\n');
DEBUG(dbgs() << "size of worklist: " << Worklist.size() << '\n');