# RUN: llc --verify-machineinstrs -mtriple=aarch64 -o - %s -run-pass pipeliner -aarch64-enable-pipeliner -debug-only=pipeliner 2>&1 | FileCheck %s
# REQUIRES: asserts

# unacceptable loops by pipeliner

...
---
name:            func1
tracksRegLiveness: true
body:             |
  ; multiple counter increment instructions
  ; CHECK: Unable to analyzeLoop, can NOT pipeline Loop
  bb.0.entry:
    liveins: $x0, $x1
    %10:gpr64 = COPY $x0
    %11:gpr64 = COPY $x1

  bb.1:
    %12:gpr64 = PHI %11, %bb.0, %13, %bb.1
    %13:gpr64 = ADDXrr %12, %11
    %14:gpr64 = ADDXrr %13, %11
    dead $xzr = SUBSXrr %10, %14, implicit-def $nzcv
    Bcc 1, %bb.1, implicit $nzcv
    B %bb.2

  bb.2:
...
---
name:            func2
tracksRegLiveness: true
body:             |
  ; neither operand of the increment instruction is a loop invariant value
  ; CHECK: Unable to analyzeLoop, can NOT pipeline Loop
  bb.0.entry:
    liveins: $x0, $x1
    %10:gpr64 = COPY $x0
    %11:gpr64 = COPY $x1

  bb.1:
    %12:gpr64 = PHI %11, %bb.0, %13, %bb.1
    %13:gpr64 = ADDXrr %12, %12
    dead $xzr = SUBSXrr %10, %13, implicit-def $nzcv
    Bcc 1, %bb.1, implicit $nzcv
    B %bb.2

  bb.2:
...
---
name:            func3
tracksRegLiveness: true
body:             |
  ; neither operand of the compare instruction is a loop invariant value
  ; CHECK: Unable to analyzeLoop, can NOT pipeline Loop
  bb.0.entry:
    liveins: $x0, $x1
    %10:gpr64 = COPY $x0
    %11:gpr64 = COPY $x1

  bb.1:
    %12:gpr64 = PHI %11, %bb.0, %13, %bb.1
    %13:gpr64 = ADDXrr %12, %11
    dead $xzr = SUBSXrr %13, %13, implicit-def $nzcv
    Bcc 1, %bb.1, implicit $nzcv
    B %bb.2

  bb.2:
...
---
name:            func4
tracksRegLiveness: true
body:             |
  ; multiple phi instructions
  ; CHECK: Unable to analyzeLoop, can NOT pipeline Loop
  bb.0.entry:
    liveins: $x0, $x1
    %10:gpr64 = COPY $x0
    %11:gpr64 = COPY $x1

  bb.1:
    %12:gpr64 = PHI %11, %bb.0, %13, %bb.1
    %14:gpr64 = PHI %11, %bb.0, %15, %bb.1
    dead $xzr = SUBSXrr %12, %10, implicit-def $nzcv
    %13:gpr64 = ADDXrr %14, %11
    %15:gpr64 = ADDXrr %12, %11
    Bcc 1, %bb.1, implicit $nzcv
    B %bb.2

  bb.2:
...
---
name:            func5
tracksRegLiveness: true
body:             |
  ; not an increment instruction
  ; CHECK: Unable to analyzeLoop, can NOT pipeline Loop
  bb.0.entry:
    liveins: $x0, $x1
    %10:gpr64 = COPY $x0
    %11:gpr64 = COPY $x1

  bb.1:
    %12:gpr64 = PHI %11, %bb.0, %13, %bb.1
    %13:gpr64 = ORRXrr %12, %12
    dead $xzr = SUBSXrr %12, %10, implicit-def $nzcv
    Bcc 1, %bb.1, implicit $nzcv
    B %bb.2

  bb.2:
...