llvm-project

5298e757 - [GlobalISel] Add G_EXTRACT_SUBVECTOR to computeNumSignBits (#216798)

[GlobalISel] Add G_EXTRACT_SUBVECTOR to computeNumSignBits (#216798) Port the SDAG EXTRACT_SUBVECTOR computeNumSignBits handling to GlobalISel. Offsets the demanded elements by the subvector index to propagate sign bits from the source vector to the extracted subvector. For scalable vectors, conservatively demands all elements. Part of #150515.