mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-10-19 11:02:59 +02:00
ae65e281f3
to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
115 lines
3.4 KiB
C++
115 lines
3.4 KiB
C++
//===--- DeltaAlgorithm.cpp - A Set Minimization Algorithm -----*- C++ -*--===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/ADT/DeltaAlgorithm.h"
|
|
#include <algorithm>
|
|
#include <iterator>
|
|
#include <set>
|
|
using namespace llvm;
|
|
|
|
DeltaAlgorithm::~DeltaAlgorithm() {
|
|
}
|
|
|
|
bool DeltaAlgorithm::GetTestResult(const changeset_ty &Changes) {
|
|
if (FailedTestsCache.count(Changes))
|
|
return false;
|
|
|
|
bool Result = ExecuteOneTest(Changes);
|
|
if (!Result)
|
|
FailedTestsCache.insert(Changes);
|
|
|
|
return Result;
|
|
}
|
|
|
|
void DeltaAlgorithm::Split(const changeset_ty &S, changesetlist_ty &Res) {
|
|
// FIXME: Allow clients to provide heuristics for improved splitting.
|
|
|
|
// FIXME: This is really slow.
|
|
changeset_ty LHS, RHS;
|
|
unsigned idx = 0, N = S.size() / 2;
|
|
for (changeset_ty::const_iterator it = S.begin(),
|
|
ie = S.end(); it != ie; ++it, ++idx)
|
|
((idx < N) ? LHS : RHS).insert(*it);
|
|
if (!LHS.empty())
|
|
Res.push_back(LHS);
|
|
if (!RHS.empty())
|
|
Res.push_back(RHS);
|
|
}
|
|
|
|
DeltaAlgorithm::changeset_ty
|
|
DeltaAlgorithm::Delta(const changeset_ty &Changes,
|
|
const changesetlist_ty &Sets) {
|
|
// Invariant: union(Res) == Changes
|
|
UpdatedSearchState(Changes, Sets);
|
|
|
|
// If there is nothing left we can remove, we are done.
|
|
if (Sets.size() <= 1)
|
|
return Changes;
|
|
|
|
// Look for a passing subset.
|
|
changeset_ty Res;
|
|
if (Search(Changes, Sets, Res))
|
|
return Res;
|
|
|
|
// Otherwise, partition the sets if possible; if not we are done.
|
|
changesetlist_ty SplitSets;
|
|
for (changesetlist_ty::const_iterator it = Sets.begin(),
|
|
ie = Sets.end(); it != ie; ++it)
|
|
Split(*it, SplitSets);
|
|
if (SplitSets.size() == Sets.size())
|
|
return Changes;
|
|
|
|
return Delta(Changes, SplitSets);
|
|
}
|
|
|
|
bool DeltaAlgorithm::Search(const changeset_ty &Changes,
|
|
const changesetlist_ty &Sets,
|
|
changeset_ty &Res) {
|
|
// FIXME: Parallelize.
|
|
for (changesetlist_ty::const_iterator it = Sets.begin(),
|
|
ie = Sets.end(); it != ie; ++it) {
|
|
// If the test passes on this subset alone, recurse.
|
|
if (GetTestResult(*it)) {
|
|
changesetlist_ty Sets;
|
|
Split(*it, Sets);
|
|
Res = Delta(*it, Sets);
|
|
return true;
|
|
}
|
|
|
|
// Otherwise, if we have more than two sets, see if test passes on the
|
|
// complement.
|
|
if (Sets.size() > 2) {
|
|
// FIXME: This is really slow.
|
|
changeset_ty Complement;
|
|
std::set_difference(
|
|
Changes.begin(), Changes.end(), it->begin(), it->end(),
|
|
std::insert_iterator<changeset_ty>(Complement, Complement.begin()));
|
|
if (GetTestResult(Complement)) {
|
|
changesetlist_ty ComplementSets;
|
|
ComplementSets.insert(ComplementSets.end(), Sets.begin(), it);
|
|
ComplementSets.insert(ComplementSets.end(), it + 1, Sets.end());
|
|
Res = Delta(Complement, ComplementSets);
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
DeltaAlgorithm::changeset_ty DeltaAlgorithm::Run(const changeset_ty &Changes) {
|
|
// Check empty set first to quickly find poor test functions.
|
|
if (GetTestResult(changeset_ty()))
|
|
return changeset_ty();
|
|
|
|
// Otherwise run the real delta algorithm.
|
|
changesetlist_ty Sets;
|
|
Split(Changes, Sets);
|
|
|
|
return Delta(Changes, Sets);
|
|
}
|