llvm/test/CodeGen/ARM/branch-folder-single-bb-crash.mir

# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 5
# RUN: llc -mtriple=armv7-apple-ios --run-pass=branch-folder %s -o - | FileCheck %s

## We hoist code from successor blocks, and in abnormal circumstances we can
## have control flow that branches to the same block. Test we handle that
## correctly.
##
## bb.5 (empty fall-through) folds into bb.6, making bb.2 branch to bb.6
## unconditionally on a conditional branch (both edges go to bb.6).
## Instructions are hosited from bb.2's successors, which is bb.6 twice,
## along both edges.

...
---
name:            f_1418_2054
tracksRegLiveness: true
noPhis:          true
isSSA:           false
noVRegs:         true
body:             |
  ; CHECK-LABEL: name: f_1418_2054
  ; CHECK: bb.0:
  ; CHECK-NEXT:   successors: %bb.1(0x80000000)
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.1:
  ; CHECK-NEXT:   successors: %bb.1(0x40000000), %bb.2(0x40000000)
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   $r0 = MOVr undef $r0, 14 /* CC::al */, $noreg, $noreg
  ; CHECK-NEXT:   Bcc %bb.1, 1 /* CC::ne */, undef $cpsr
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.2:
  ; CHECK-NEXT:   successors: %bb.3(0x40000000), %bb.4(0x40000000)
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   $r0 = MOVr undef $r0, 14 /* CC::al */, $noreg, $noreg
  ; CHECK-NEXT:   Bcc %bb.4, 1 /* CC::ne */, undef $cpsr
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.3:
  ; CHECK-NEXT:   BX_RET 14 /* CC::al */, $noreg
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.4:
  ; CHECK-NEXT:   TRAP
  bb.0:
    successors: %bb.1

  bb.1:
    successors: %bb.3, %bb.2

    Bcc %bb.3, 1, undef $cpsr
    B %bb.2

  bb.2:
    successors: %bb.5, %bb.6

    Bcc %bb.5, 1, undef $cpsr
    B %bb.6

  bb.3:
    successors: %bb.4

    $r0 = MOVr undef $r0, 14, $noreg, $noreg

  bb.4:
    successors: %bb.1

    B %bb.1

  bb.5:
    successors: %bb.6

  bb.6:
    successors: %bb.8, %bb.7

    $r0 = MOVr undef $r0, 14, $noreg, $noreg
    $r0 = MOVr undef $r0, 14, $noreg, $noreg

    Bcc %bb.7, 1, undef $cpsr
    B %bb.8

  bb.7:
    successors:

    TRAP

  bb.8:
    BX_RET 14, _
...