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Sanjay Patel
b34960fe47
[ValueTracking] peek through shuffles in ComputeNumSignBits (PR37549)
The motivating case is from PR37549: https://bugs.llvm.org/show_bug.cgi?id=37549 The analysis improvement allows us to form a vector 'select' out of bitwise logic (the use of ComputeNumSignBits was added at rL345149). The smaller test shows another InstCombine improvement - we use ComputeNumSignBits to add 'nsw' to shift-left. But the negative test shows an example where we must not add 'nsw' - when the shuffle mask contains undef elements. Differential Revision: https://reviews.llvm.org/D53659 llvm-svn: 345429
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