unsigned int test_lzcnt_u32(unsigned int __X)
{
// CHECK: @llvm.ctlz.i32
return _lzcnt_u32(__X);
}
void APLWAHSet::fromVector(const vector<int>& v){
length = v.size();
chunkMax = (v.back()/31) + 1;
bitmap.clear();
bitmap.reserve(chunkMax/4);
int CCount = 0;
vector<int>::const_iterator ICount = v.begin();
vector<int>::const_iterator lastLitStart = v.begin();
vector<int>::const_iterator lastLitEnd = v.begin();
Word lastLit = 0;
while(ICount != v.end()){
int litStart = *ICount; //本Literal的第一个数字
int litCCount = litStart/31;
int FillCount = litCCount - CCount;
vector<int>::const_iterator IEnd = ICount; //ICount当前data的指针，IEnd本Literal的最后一个数字在data中的index
int litEnd = litCCount*31 + 31; //本Literal的边界末尾
Word lit = 0x80000000;
while(IEnd != v.end() && *IEnd < litEnd){
lit |= 1<<(*IEnd%31);
IEnd ++;
}
if(lastLitStart == lastLitEnd){ // 没有预备L
if(FillCount == 0){ // 得到L
if(IEnd - ICount < 4){ //之后可能被压缩，作为后备L
lastLitStart = ICount;
lastLitEnd = IEnd;
lastLit = lit;
}
else{ //不可能被压缩，直接输出
bitmap.push_back(lit);
}
}
else{ // 得到 F与L
if(IEnd - ICount < 4){ //可能生成FL
int n = (_lzcnt_u32(FillCount) - 5)/5;
if(IEnd - ICount > n){ //Fill太大，不能生成FL，L留作预备
bitmap.push_back(FillCount);
lastLitStart = ICount;
lastLitEnd = IEnd;
lastLit = lit;
}
else{ //可以生成FL
FillCount |= (IEnd - ICount) << 27;
for(vector<int>::const_iterator itr = ICount;itr < IEnd;itr++){
FillCount |= (*itr%31) << (22 - 5*(itr - ICount)) ;
}
bitmap.push_back(FillCount);
}
}
else{ //L太脏，不能生成FL
bitmap.push_back(FillCount);
bitmap.push_back(lit);
}
}
}
else{ //有预备L
if(FillCount==0){ // L+L
if(IEnd - ICount < 4){ //后一个可能可能被压缩
if(IEnd - ICount + lastLitEnd - lastLitStart < 6){ //LL 可以生成
lit = 0;
lit |= (lastLitEnd - lastLitStart) << 29;
lit |= (IEnd - ICount) << 27;
for(vector<int>::const_iterator itr = lastLitStart;itr < lastLitEnd;itr++){
lit |= (*itr%31) << (22 - 5*(itr - lastLitStart)) ;
}
int countStart = (ICount - lastLitEnd) + (lastLitStart - v.begin());
for(vector<int>::const_iterator itr = ICount;itr < IEnd;itr++){
lit |= (*itr%31) << (22 - 5*(itr - v.begin() - countStart)) ;
}
bitmap.push_back(lit);
lastLitStart = lastLitEnd;
}
else{ // LL不能生成，输出预备L，现有L留作预备
bitmap.push_back(lastLit);
lastLit = lit;
lastLitStart = ICount;
lastLitEnd = IEnd;
}
}
else{ //现有L太脏，全输出
bitmap.push_back(lastLit);
bitmap.push_back(lit);
lastLitStart = lastLitEnd;
}
}
else{ // 得到L，F，L
if(IEnd - ICount < 4){ //现有L可能被压缩
int n = ((_lzcnt_u32(FillCount) - 5)/5) + 1;
if(IEnd - ICount + lastLitEnd - lastLitStart < n){ // LFL可以生成
FillCount |= (lastLitEnd - lastLitStart) << 29;
FillCount |= (IEnd - ICount) << 27;
for(vector<int>::const_iterator itr = lastLitStart;itr < lastLitEnd;itr++){
FillCount |= (*itr%31) << (22 - 5*(itr - lastLitStart)) ;
}
int countStart = ICount - lastLitEnd + lastLitStart - v.begin();
for(vector<int>::const_iterator itr = ICount;itr < IEnd;itr++){
FillCount |= (*itr%31) << (22 - 5*(itr - v.begin() - countStart)) ;
}
bitmap.push_back(FillCount);
lastLitStart = lastLitEnd;
}
else if(lastLitEnd - lastLitStart < n){ // LF 可以生成
FillCount |= (lastLitEnd - lastLitStart) << 29;
for(vector<int>::const_iterator itr = lastLitStart;itr < lastLitEnd;itr++){
FillCount |= (*itr%31) << (22 - 5*(itr - lastLitStart)) ;
}
bitmap.push_back(FillCount);
lastLitStart = ICount;
lastLitEnd = IEnd;
lastLit = lit;
}
else if(IEnd - ICount < n){ //FL可以生成
bitmap.push_back(lastLit);
FillCount |= (IEnd - ICount) << 27;
for(vector<int>::const_iterator itr = ICount;itr < IEnd;itr++){
FillCount |= (*itr%31) << (22 - 5*(itr - ICount)) ;
}
bitmap.push_back(FillCount);
lastLitStart = lastLitEnd;
}
else{ //都不能生成
bitmap.push_back(lastLit);
bitmap.push_back(FillCount);
lastLit = lit;
lastLitStart = ICount;
lastLitEnd = IEnd;
}
}
else{ //现有L太脏
bitmap.push_back(lastLit);
bitmap.push_back(FillCount);
bitmap.push_back(lit);
lastLitStart = lastLitEnd;
}
}
}
CCount = litCCount + 1;
ICount = IEnd;
}
if(lastLitStart != lastLitEnd){
bitmap.push_back(lastLit);
}
}