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Commit 523cd829 authored by Sanjay Patel's avatar Sanjay Patel
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[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

llvm-svn: 284424
parent fac32f3f
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