llvm::Value *Sorter::NumTuples(CodeGen &codegen,
llvm::Value *sorter_ptr) const {
// Pull out start and end (char **)
auto *start = codegen.Load(SorterProxy::tuples_start, sorter_ptr);
auto *end = codegen.Load(SorterProxy::tuples_end, sorter_ptr);
// Convert both to uint64_t
start = codegen->CreatePtrToInt(start, codegen.Int64Type());
end = codegen->CreatePtrToInt(end, codegen.Int64Type());
// Subtract (end - start)
auto *diff = codegen->CreateSub(end, start);
// Divide by pointer size (diff >> 3, or div / 8)
return codegen->CreateAShr(diff, 3, "numTuples", true);
}
llvm::Value *Sorter::GetNumberOfStoredTuples(CodeGen &codegen,
llvm::Value *sorter_ptr) const {
// TODO: util::Sorter has a function to handle this ...
llvm::Value *start_pos = GetStartPosition(codegen, sorter_ptr);
llvm::Value *end_pos = GetEndPosition(codegen, sorter_ptr);
llvm::Value *tuple_size =
codegen->CreateZExt(GetTupleSize(codegen), codegen.Int64Type());
llvm::Value *diff_bytes = codegen->CreatePtrDiff(end_pos, start_pos);
llvm::Value *num_tuples = codegen->CreateUDiv(diff_bytes, tuple_size);
return codegen->CreateTruncOrBitCast(num_tuples, codegen.Int32Type());
}