--- a/lib/Support/APInt.cpp	Wed Feb 18 14:56:07 2015 +0900
+++ b/lib/Support/APInt.cpp	Tue Oct 13 17:48:58 2015 +0900
@@ -162,7 +162,7 @@
   return clearUnusedBits();
 }
 
-/// Profile - This method 'profiles' an APInt for use with FoldingSet.
+/// This method 'profiles' an APInt for use with FoldingSet.
 void APInt::Profile(FoldingSetNodeID& ID) const {
   ID.AddInteger(BitWidth);
 
@@ -176,7 +176,7 @@
     ID.AddInteger(pVal[i]);
 }
 
-/// add_1 - This function adds a single "digit" integer, y, to the multiple
+/// This function adds a single "digit" integer, y, to the multiple
 /// "digit" integer array,  x[]. x[] is modified to reflect the addition and
 /// 1 is returned if there is a carry out, otherwise 0 is returned.
 /// @returns the carry of the addition.
@@ -202,7 +202,7 @@
   return clearUnusedBits();
 }
 
-/// sub_1 - This function subtracts a single "digit" (64-bit word), y, from
+/// This function subtracts a single "digit" (64-bit word), y, from
 /// the multi-digit integer array, x[], propagating the borrowed 1 value until
 /// no further borrowing is neeeded or it runs out of "digits" in x.  The result
 /// is 1 if "borrowing" exhausted the digits in x, or 0 if x was not exhausted.
@@ -231,7 +231,7 @@
   return clearUnusedBits();
 }
 
-/// add - This function adds the integer array x to the integer array Y and
+/// This function adds the integer array x to the integer array Y and
 /// places the result in dest.
 /// @returns the carry out from the addition
 /// @brief General addition of 64-bit integer arrays
@@ -672,12 +672,20 @@
   return hash_combine_range(Arg.pVal, Arg.pVal + Arg.getNumWords());
 }
 
-/// HiBits - This function returns the high "numBits" bits of this APInt.
+bool APInt::isSplat(unsigned SplatSizeInBits) const {
+  assert(getBitWidth() % SplatSizeInBits == 0 &&
+         "SplatSizeInBits must divide width!");
+  // We can check that all parts of an integer are equal by making use of a
+  // little trick: rotate and check if it's still the same value.
+  return *this == rotl(SplatSizeInBits);
+}
+
+/// This function returns the high "numBits" bits of this APInt.
 APInt APInt::getHiBits(unsigned numBits) const {
   return APIntOps::lshr(*this, BitWidth - numBits);
 }
 
-/// LoBits - This function returns the low "numBits" bits of this APInt.
+/// This function returns the low "numBits" bits of this APInt.
 APInt APInt::getLoBits(unsigned numBits) const {
   return APIntOps::lshr(APIntOps::shl(*this, BitWidth - numBits),
                         BitWidth - numBits);
@@ -853,7 +861,7 @@
   return isNeg ? -Tmp : Tmp;
 }
 
-/// RoundToDouble - This function converts this APInt to a double.
+/// This function converts this APInt to a double.
 /// The layout for double is as following (IEEE Standard 754):
 ///  --------------------------------------
 /// |  Sign    Exponent    Fraction    Bias |
@@ -1310,13 +1318,8 @@
   // libc sqrt function which will probably use a hardware sqrt computation.
   // This should be faster than the algorithm below.
   if (magnitude < 52) {
-#if HAVE_ROUND
     return APInt(BitWidth,
                  uint64_t(::round(::sqrt(double(isSingleWord()?VAL:pVal[0])))));
-#else
-    return APInt(BitWidth,
-                 uint64_t(::sqrt(double(isSingleWord()?VAL:pVal[0])) + 0.5));
-#endif
   }
 
   // Okay, all the short cuts are exhausted. We must compute it. The following
@@ -1508,21 +1511,18 @@
   assert(u && "Must provide dividend");
   assert(v && "Must provide divisor");
   assert(q && "Must provide quotient");
-  assert(u != v && u != q && v != q && "Must us different memory");
+  assert(u != v && u != q && v != q && "Must use different memory");
   assert(n>1 && "n must be > 1");
 
-  // Knuth uses the value b as the base of the number system. In our case b
-  // is 2^31 so we just set it to -1u.
-  uint64_t b = uint64_t(1) << 32;
-
-#if 0
+  // b denotes the base of the number system. In our case b is 2^32.
+  LLVM_CONSTEXPR uint64_t b = uint64_t(1) << 32;
+
   DEBUG(dbgs() << "KnuthDiv: m=" << m << " n=" << n << '\n');
   DEBUG(dbgs() << "KnuthDiv: original:");
   DEBUG(for (int i = m+n; i >=0; i--) dbgs() << " " << u[i]);
   DEBUG(dbgs() << " by");
   DEBUG(for (int i = n; i >0; i--) dbgs() << " " << v[i-1]);
   DEBUG(dbgs() << '\n');
-#endif
   // D1. [Normalize.] Set d = b / (v[n-1] + 1) and multiply all the digits of
   // u and v by d. Note that we have taken Knuth's advice here to use a power
   // of 2 value for d such that d * v[n-1] >= b/2 (b is the base). A power of
@@ -1547,13 +1547,12 @@
     }
   }
   u[m+n] = u_carry;
-#if 0
+
   DEBUG(dbgs() << "KnuthDiv:   normal:");
   DEBUG(for (int i = m+n; i >=0; i--) dbgs() << " " << u[i]);
   DEBUG(dbgs() << " by");
   DEBUG(for (int i = n; i >0; i--) dbgs() << " " << v[i-1]);
   DEBUG(dbgs() << '\n');
-#endif
 
   // D2. [Initialize j.]  Set j to m. This is the loop counter over the places.
   int j = m;
@@ -1583,44 +1582,23 @@
     // (u[j+n]u[j+n-1]..u[j]) - qp * (v[n-1]...v[1]v[0]). This computation
     // consists of a simple multiplication by a one-place number, combined with
     // a subtraction.
-    bool isNeg = false;
-    for (unsigned i = 0; i < n; ++i) {
-      uint64_t u_tmp = uint64_t(u[j+i]) | (uint64_t(u[j+i+1]) << 32);
-      uint64_t subtrahend = uint64_t(qp) * uint64_t(v[i]);
-      bool borrow = subtrahend > u_tmp;
-      DEBUG(dbgs() << "KnuthDiv: u_tmp == " << u_tmp
-                   << ", subtrahend == " << subtrahend
-                   << ", borrow = " << borrow << '\n');
-
-      uint64_t result = u_tmp - subtrahend;
-      unsigned k = j + i;
-      u[k++] = (unsigned)(result & (b-1)); // subtract low word
-      u[k++] = (unsigned)(result >> 32);   // subtract high word
-      while (borrow && k <= m+n) { // deal with borrow to the left
-        borrow = u[k] == 0;
-        u[k]--;
-        k++;
-      }
-      isNeg |= borrow;
-      DEBUG(dbgs() << "KnuthDiv: u[j+i] == " << u[j+i] << ",  u[j+i+1] == " <<
-                    u[j+i+1] << '\n');
-    }
-    DEBUG(dbgs() << "KnuthDiv: after subtraction:");
-    DEBUG(for (int i = m+n; i >=0; i--) dbgs() << " " << u[i]);
-    DEBUG(dbgs() << '\n');
     // The digits (u[j+n]...u[j]) should be kept positive; if the result of
     // this step is actually negative, (u[j+n]...u[j]) should be left as the
     // true value plus b**(n+1), namely as the b's complement of
     // the true value, and a "borrow" to the left should be remembered.
-    //
-    if (isNeg) {
-      bool carry = true;  // true because b's complement is "complement + 1"
-      for (unsigned i = 0; i <= m+n; ++i) {
-        u[i] = ~u[i] + carry; // b's complement
-        carry = carry && u[i] == 0;
-      }
+    int64_t borrow = 0;
+    for (unsigned i = 0; i < n; ++i) {
+      uint64_t p = uint64_t(qp) * uint64_t(v[i]);
+      int64_t subres = int64_t(u[j+i]) - borrow - (unsigned)p;
+      u[j+i] = (unsigned)subres;
+      borrow = (p >> 32) - (subres >> 32);
+      DEBUG(dbgs() << "KnuthDiv: u[j+i] = " << u[j+i]
+                   << ", borrow = " << borrow << '\n');
     }
-    DEBUG(dbgs() << "KnuthDiv: after complement:");
+    bool isNeg = u[j+n] < borrow;
+    u[j+n] -= (unsigned)borrow;
+
+    DEBUG(dbgs() << "KnuthDiv: after subtraction:");
     DEBUG(for (int i = m+n; i >=0; i--) dbgs() << " " << u[i]);
     DEBUG(dbgs() << '\n');
 
@@ -1644,7 +1622,7 @@
       u[j+n] += carry;
     }
     DEBUG(dbgs() << "KnuthDiv: after correction:");
-    DEBUG(for (int i = m+n; i >=0; i--) dbgs() <<" " << u[i]);
+    DEBUG(for (int i = m+n; i >=0; i--) dbgs() << " " << u[i]);
     DEBUG(dbgs() << "\nKnuthDiv: digit result = " << q[j] << '\n');
 
   // D7. [Loop on j.]  Decrease j by one. Now if j >= 0, go back to D3.
@@ -1677,9 +1655,7 @@
     }
     DEBUG(dbgs() << '\n');
   }
-#if 0
   DEBUG(dbgs() << '\n');
-#endif
 }
 
 void APInt::divide(const APInt LHS, unsigned lhsWords,
@@ -1803,6 +1779,8 @@
 
     // The quotient is in Q. Reconstitute the quotient into Quotient's low
     // order words.
+    // This case is currently dead as all users of divide() handle trivial cases
+    // earlier.
     if (lhsWords == 1) {
       uint64_t tmp =
         uint64_t(Q[0]) | (uint64_t(Q[1]) << (APINT_BITS_PER_WORD / 2));
@@ -2281,9 +2259,8 @@
   std::reverse(Str.begin()+StartDig, Str.end());
 }
 
-/// toString - This returns the APInt as a std::string.  Note that this is an
-/// inefficient method.  It is better to pass in a SmallVector/SmallString
-/// to the methods above.
+/// Returns the APInt as a std::string. Note that this is an inefficient method.
+/// It is better to pass in a SmallVector/SmallString to the methods above.
 std::string APInt::toString(unsigned Radix = 10, bool Signed = true) const {
   SmallString<40> S;
   toString(S, Radix, Signed, /* formatAsCLiteral = */false);
@@ -2296,13 +2273,13 @@
   this->toStringUnsigned(U);
   this->toStringSigned(S);
   dbgs() << "APInt(" << BitWidth << "b, "
-         << U.str() << "u " << S.str() << "s)";
+         << U << "u " << S << "s)";
 }
 
 void APInt::print(raw_ostream &OS, bool isSigned) const {
   SmallString<40> S;
   this->toString(S, 10, isSigned, /* formatAsCLiteral = */false);
-  OS << S.str();
+  OS << S;
 }
 
 // This implements a variety of operations on a representation of