Imported Upstream version 5.18.0.167

Former-commit-id: 289509151e0fee68a1b591a20c9f109c3c789d3a

external/llvm/lib/Support/IntervalMap.cpp

@@ -1,161 +0,0 @@
-//===- lib/Support/IntervalMap.cpp - A sorted interval map ----------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file implements the few non-templated functions in IntervalMap.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/ADT/IntervalMap.h"
-
-namespace llvm {
-namespace IntervalMapImpl {
-
-void Path::replaceRoot(void *Root, unsigned Size, IdxPair Offsets) {
-  assert(!path.empty() && "Can't replace missing root");
-  path.front() = Entry(Root, Size, Offsets.first);
-  path.insert(path.begin() + 1, Entry(subtree(0), Offsets.second));
-}
-
-NodeRef Path::getLeftSibling(unsigned Level) const {
-  // The root has no siblings.
-  if (Level == 0)
-    return NodeRef();
-
-  // Go up the tree until we can go left.
-  unsigned l = Level - 1;
-  while (l && path[l].offset == 0)
-    --l;
-
-  // We can't go left.
-  if (path[l].offset == 0)
-    return NodeRef();
-
-  // NR is the subtree containing our left sibling.
-  NodeRef NR = path[l].subtree(path[l].offset - 1);
-
-  // Keep right all the way down.
-  for (++l; l != Level; ++l)
-    NR = NR.subtree(NR.size() - 1);
-  return NR;
-}
-
-void Path::moveLeft(unsigned Level) {
-  assert(Level != 0 && "Cannot move the root node");
-
-  // Go up the tree until we can go left.
-  unsigned l = 0;
-  if (valid()) {
-    l = Level - 1;
-    while (path[l].offset == 0) {
-      assert(l != 0 && "Cannot move beyond begin()");
-      --l;
-    }
-  } else if (height() < Level)
-    // end() may have created a height=0 path.
-    path.resize(Level + 1, Entry(nullptr, 0, 0));
-
-  // NR is the subtree containing our left sibling.
-  --path[l].offset;
-  NodeRef NR = subtree(l);
-
-  // Get the rightmost node in the subtree.
-  for (++l; l != Level; ++l) {
-    path[l] = Entry(NR, NR.size() - 1);
-    NR = NR.subtree(NR.size() - 1);
-  }
-  path[l] = Entry(NR, NR.size() - 1);
-}
-
-NodeRef Path::getRightSibling(unsigned Level) const {
-  // The root has no siblings.
-  if (Level == 0)
-    return NodeRef();
-
-  // Go up the tree until we can go right.
-  unsigned l = Level - 1;
-  while (l && atLastEntry(l))
-    --l;
-
-  // We can't go right.
-  if (atLastEntry(l))
-    return NodeRef();
-
-  // NR is the subtree containing our right sibling.
-  NodeRef NR = path[l].subtree(path[l].offset + 1);
-
-  // Keep left all the way down.
-  for (++l; l != Level; ++l)
-    NR = NR.subtree(0);
-  return NR;
-}
-
-void Path::moveRight(unsigned Level) {
-  assert(Level != 0 && "Cannot move the root node");
-
-  // Go up the tree until we can go right.
-  unsigned l = Level - 1;
-  while (l && atLastEntry(l))
-    --l;
-
-  // NR is the subtree containing our right sibling. If we hit end(), we have
-  // offset(0) == node(0).size().
-  if (++path[l].offset == path[l].size)
-    return;
-  NodeRef NR = subtree(l);
-
-  for (++l; l != Level; ++l) {
-    path[l] = Entry(NR, 0);
-    NR = NR.subtree(0);
-  }
-  path[l] = Entry(NR, 0);
-}
-
-
-IdxPair distribute(unsigned Nodes, unsigned Elements, unsigned Capacity,
-                   const unsigned *CurSize, unsigned NewSize[],
-                   unsigned Position, bool Grow) {
-  assert(Elements + Grow <= Nodes * Capacity && "Not enough room for elements");
-  assert(Position <= Elements && "Invalid position");
-  if (!Nodes)
-    return IdxPair();
-
-  // Trivial algorithm: left-leaning even distribution.
-  const unsigned PerNode = (Elements + Grow) / Nodes;
-  const unsigned Extra = (Elements + Grow) % Nodes;
-  IdxPair PosPair = IdxPair(Nodes, 0);
-  unsigned Sum = 0;
-  for (unsigned n = 0; n != Nodes; ++n) {
-    Sum += NewSize[n] = PerNode + (n < Extra);
-    if (PosPair.first == Nodes && Sum > Position)
-      PosPair = IdxPair(n, Position - (Sum - NewSize[n]));
-  }
-  assert(Sum == Elements + Grow && "Bad distribution sum");
-
-  // Subtract the Grow element that was added.
-  if (Grow) {
-    assert(PosPair.first < Nodes && "Bad algebra");
-    assert(NewSize[PosPair.first] && "Too few elements to need Grow");
-    --NewSize[PosPair.first];
-  }
-
-#ifndef NDEBUG
-  Sum = 0;
-  for (unsigned n = 0; n != Nodes; ++n) {
-    assert(NewSize[n] <= Capacity && "Overallocated node");
-    Sum += NewSize[n];
-  }
-  assert(Sum == Elements && "Bad distribution sum");
-#endif
-
-  return PosPair;
-}
-
-} // namespace IntervalMapImpl
-} // namespace llvm
-