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Sanjay Patel
8cc4b69873
[DAG] use isConstOrConstSplat in ComputeNumSignBits to optimize SRA
The scalar version of this pattern was noted in: https://reviews.llvm.org/D25485 and fixed with: https://reviews.llvm.org/rL284395 More refactoring of the constant/splat helpers is needed and will happen in follow-up patches. Differential Revision: https://reviews.llvm.org/D25685 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@284424 91177308-0d34-0410-b5e6-96231b3b80d8
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