[all-commits] [llvm/llvm-project] 32d761: [AArch64][machine-scheduler][Neoverse-N2] fdiv is ...

[Simon Wallis via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 32d761bbec660c977322afeac1acbafd46008752
      https://github.com/llvm/llvm-project/commit/32d761bbec660c977322afeac1acbafd46008752
  Author: Simon Wallis <simon.wallis2 at arm.com>
  Date:   2025-01-06 (Mon, 06 Jan 2025)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64SchedNeoverseN2.td
    M llvm/test/CodeGen/AArch64/machine-combiner.ll
    M llvm/test/tools/llvm-mca/AArch64/Neoverse/N2-basic-instructions.s

  Log Message:
  -----------
  [AArch64][machine-scheduler][Neoverse-N2] fdiv is blocking (#119206)

For Neoverse-N2, mark FP divide and square root instructions as blocking
their pipeline until complete.

This matches the way that blocking integer divide instructions are
marked.

>From the Software Optimization Guide, section 3.14 Notes:
1. FP divide and square root operations are performed using an iterative
algorithm and block subsequent similar operations to the same pipeline
until complete.

---------

Co-authored-by: Cullen Rhodes <cullen.rhodes at arm.com>



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