llvm/test/CodeGen/AArch64/machine-combiner.mir

# RUN: llc -mtriple=aarch64-none-linux-gnu -mcpu=cortex-a57 -enable-unsafe-fp-math \
# RUN:     -run-pass machine-combiner -machine-combiner-inc-threshold=0 \
# RUN:     -machine-combiner-verify-pattern-order=true -verify-machineinstrs  -o - %s | FileCheck %s
---
# Test incremental depth updates succeed when triggered after the removal of
# the first instruction in a basic block.

# CHECK-LABEL: name: inc_update_iterator_test
name:            inc_update_iterator_test
registers:
  - { id: 0, class: fpr64 }
  - { id: 1, class: gpr32 }
  - { id: 2, class: gpr32 }
  - { id: 3, class: gpr32 }
  - { id: 4, class: gpr32 }
  - { id: 5, class: gpr32 }
  - { id: 6, class: gpr32 }
  - { id: 7, class: fpr64 }
  - { id: 8, class: fpr64 }
  - { id: 9, class: fpr64 }
body:             |
  bb.0:
    successors: %bb.1, %bb.2

    %3 = COPY $w2
    %2 = COPY $w1
    %1 = COPY $w0
    %0 = COPY $d0
    %4 = SUBSWrr %1, %2, implicit-def $nzcv
    Bcc 13, %bb.2, implicit $nzcv
    B %bb.1

  bb.1:
    ; CHECK: MADDWrrr %1, %2, %3
    %5 = MADDWrrr %1, %2, $wzr
    %6 = ADDWrr %3, killed %5
    %7 = SCVTFUWDri killed %6, implicit $fpcr
    ; CHECK: FMADDDrrr %7, %7, %0, implicit $fpcr
    %8 = FMULDrr %7, %7, implicit $fpcr
    %9 = FADDDrr %0, killed %8, implicit $fpcr
    $d0 = COPY %9
    RET_ReallyLR implicit $d0

  bb.2:
    $d0 = COPY %0
    RET_ReallyLR implicit $d0

...