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APInt uses Knuth's D algorithm for long division. In rare cases the implementation applied a transformation that was not needed. Added unit tests for long division. KnuthDiv() procedure is fully covered. There is a case in APInt::divide() that I believe is never used (marked with a comment) as all users of divide() handle trivial cases earlier. Patch by Pawel Bylica! http://reviews.llvm.org/D8448 llvm-svn: 233312
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