[llvm-commits] [llvm] r99848 - in /llvm/trunk/lib/Target/X86: SSEDomainFix.cpp X86InstrInfo.cpp X86InstrInfo.h

[Chris Lattner]

Hey Jakob,

Can this use the normal bump pointer + recycler interface?

-Chris

On Mar 29, 2010, at 4:24 PM, Jakob Stoklund Olesen wrote:

> +++ llvm/trunk/lib/Target/X86/SSEDomainFix.cpp Mon Mar 29 18:24:21 2010
> @@ -29,12 +29,108 @@
> using namespace llvm;
> 
> namespace {
> +
> +/// Allocate objects from a pool, allow objects to be recycled, and provide a
> +/// way of deleting everything.
> +template<typename T, unsigned PageSize = 64>
> +class PoolAllocator {
> +  std::vector<T*> Pages, Avail;
> +public:
> +  ~PoolAllocator() { Clear(); }
> +
> +  T* Alloc() {
> +    if (Avail.empty()) {
> +      T *p = new T[PageSize];
> +      Pages.push_back(p);
> +      Avail.reserve(PageSize);
> +      for (unsigned n = 0; n != PageSize; ++n)
> +        Avail.push_back(p+n);
> +    }
> +    T *p = Avail.back();
> +    Avail.pop_back();
> +    return p;
> +  }
> +
> +  // Allow object to be reallocated. It won't be reconstructed.
> +  void Recycle(T *p) {
> +    p->clear();
> +    Avail.push_back(p);
> +  }
> +
> +  // Destroy all objects, make sure there are no external pointers to them.
> +  void Clear() {
> +    Avail.clear();
> +    while (!Pages.empty()) {
> +      delete[] Pages.back();
> +      Pages.pop_back();
> +    }
> +  }
> +};