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2. Change 0 initialization of union to larger component so all is zeroed. 3. Fix the borrow logic in subtraction so it works for > 128 bits. 4. Rewrite fromString to use a simpler but correct algorithm and also to not set the bit width contrary to the user's request. 5. Optimize toString a bit by making it only do one Knuth divide per iteration instead of two. With these changes, all arithmetic passes (verified by pari/GP) up to 1024 bits except for certain division cases. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34463 91177308-0d34-0410-b5e6-96231b3b80d8
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