[all-commits] [llvm/llvm-project] cdcce3: [SystemZ] Also accept ISD::USUBO in shouldFormOve...

[Jonas Paulsson via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: cdcce3cabf5b2e151fb324d7a7e4b6cb6e40716d
      https://github.com/llvm/llvm-project/commit/cdcce3cabf5b2e151fb324d7a7e4b6cb6e40716d
  Author: Jonas Paulsson <paulsson at linux.vnet.ibm.com>
  Date:   2020-03-03 (Tue, 03 Mar 2020)

  Changed paths:
    M llvm/lib/Target/SystemZ/SystemZISelLowering.h
    A llvm/test/CodeGen/SystemZ/codegenprepare-form-OF-ops.ll
    M llvm/test/CodeGen/SystemZ/dag-combine-05.ll

  Log Message:
  -----------
  [SystemZ]  Also accept ISD::USUBO in shouldFormOverflowOp().

Forming subtract with overflow is beneficial on SystemZ, just like additions.

Review: Ulrich Weigand

Differential Revision: https://reviews.llvm.org/D75290