1 files changed, 0 insertions, 65 deletions
diff --git a/gnu/llvm/lib/Support/KnownBits.cpp b/gnu/llvm/lib/Support/KnownBits.cpp
deleted file mode 100644
index ac790ebed35..00000000000
--- a/gnu/llvm/lib/Support/KnownBits.cpp
+++ /dev/null
@@ -1,65 +0,0 @@
-//===-- KnownBits.cpp - Stores known zeros/ones ---------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file contains a class for representing known zeros and ones used by
-// computeKnownBits.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Support/KnownBits.h"
-
-using namespace llvm;
-
-KnownBits KnownBits::computeForAddSub(bool Add, bool NSW,
-                                      const KnownBits &LHS, KnownBits RHS) {
-  // Carry in a 1 for a subtract, rather than 0.
-  bool CarryIn = false;
-  if (!Add) {
-    // Sum = LHS + ~RHS + 1
-    std::swap(RHS.Zero, RHS.One);
-    CarryIn = true;
-  }
-
-  APInt PossibleSumZero = ~LHS.Zero + ~RHS.Zero + CarryIn;
-  APInt PossibleSumOne = LHS.One + RHS.One + CarryIn;
-
-  // Compute known bits of the carry.
-  APInt CarryKnownZero = ~(PossibleSumZero ^ LHS.Zero ^ RHS.Zero);
-  APInt CarryKnownOne = PossibleSumOne ^ LHS.One ^ RHS.One;
-
-  // Compute set of known bits (where all three relevant bits are known).
-  APInt LHSKnownUnion = LHS.Zero | LHS.One;
-  APInt RHSKnownUnion = RHS.Zero | RHS.One;
-  APInt CarryKnownUnion = std::move(CarryKnownZero) | CarryKnownOne;
-  APInt Known = std::move(LHSKnownUnion) & RHSKnownUnion & CarryKnownUnion;
-
-  assert((PossibleSumZero & Known) == (PossibleSumOne & Known) &&
-         "known bits of sum differ");
-
-  // Compute known bits of the result.
-  KnownBits KnownOut;
-  KnownOut.Zero = ~std::move(PossibleSumZero) & Known;
-  KnownOut.One = std::move(PossibleSumOne) & Known;
-
-  // Are we still trying to solve for the sign bit?
-  if (!Known.isSignBitSet()) {
-    if (NSW) {
-      // Adding two non-negative numbers, or subtracting a negative number from
-      // a non-negative one, can't wrap into negative.
-      if (LHS.isNonNegative() && RHS.isNonNegative())
-        KnownOut.makeNonNegative();
-      // Adding two negative numbers, or subtracting a non-negative number from
-      // a negative one, can't wrap into non-negative.
-      else if (LHS.isNegative() && RHS.isNegative())
-        KnownOut.makeNegative();
-    }
-  }
-
-  return KnownOut;
-}