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to be safe. 2. Make internal functions that return a carry/borrow return bool instead of uint64_t because the carry/borrow can only be in range [0,1]. 3. Assert that the pointers to KnuthDiv are all different so that the result and operands can't overlap. 4. Add debug output to KnuthDiv function. 5. Fix a problem with KnuthDiv by separating the b's complement operation from the subtraction borrow operation. This fixes a wide range of division problems, but alas, not all of them. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34554 91177308-0d34-0410-b5e6-96231b3b80d8
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