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[AArch64][SVE] Add SVE intrinsics for saturating add & subtract

Authored by kmclaughlin on Apr 6 2020, 1:35 AM.

Description

[AArch64][SVE] Add SVE intrinsics for saturating add & subtract

Summary:
Adds the following intrinsics:

  • @llvm.aarch64.sve.[s|u]qadd.x
  • @llvm.aarch64.sve.[s|u]qsub.x

Reviewers: sdesmalen, c-rhodes, dancgr, efriedma, cameron.mcinally, rengolin

Reviewed By: efriedma

Subscribers: tschuett, kristof.beyls, hiraditya, rkruppe, psnobl, danielkiss, cfe-commits, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D77054