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------------------------------------------------------------------------ r324195 | mcrosier | 2018-02-04 16:42:24 +0100 (Sun, 04 Feb 2018) | 12 lines [LV] Use Demanded Bits and ValueTracking for reduction type-shrinking The type-shrinking logic in reduction detection, although narrow in scope, is also rather ad-hoc, which has led to bugs (e.g., PR35734). This patch modifies the approach to rely on the demanded bits and value tracking analyses, if available. We currently perform type-shrinking separately for reductions and other instructions in the loop. Long-term, we should probably think about computing minimal bit widths in a more complete way for the loops we want to vectorize. PR35734 Differential Revision: https://reviews.llvm.org/D42309 ------------------------------------------------------------------------ git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_60@325508 91177308-0d34-0410-b5e6-96231b3b80d8