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Summary: When we have the following case: %cond = cmp iN %x, CmpConst %tr = trunc iN %x to iK %narrowsel = select i1 %cond, iK %t, iK C We could possibly match only min/max pattern after looking through cast. So it is more profitable if widened C constant will be equal CmpConst. That is why just set widened C constant equal to CmpConst, because there is a further check in this function that trunc CmpConst == C. Also description for lookTroughCast function was added. Reviewers: spatel Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D38536 Patch by: Artur Gainullin <artur.gainullin@intel.com> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@316070 91177308-0d34-0410-b5e6-96231b3b80d8
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