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To avoid problems with zero shifts when getting the bits that move between words we use a trick: first shift the by amount-1, then do another shift by one. When amount is 0 (and size 32) we first shift by 31, then by one, instead of by 32. Also fix a latent bug that emitted the low and high words in the wrong order when shifting right. Fixes PR12113. llvm-svn: 151637 |
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