src/third_party/llvm-project/llvm/test/CodeGen/ARM/ifcvt_triangleWoCvtToNextEdge.mir

# RUN: llc -mtriple=arm-apple-ios -run-pass=if-converter %s -o - | FileCheck %s
--- |
  declare void @__stack_chk_fail()
  declare void @bar()

  define void @foo() {
    ret void
  }
...
---
name:            foo
body:             |

  bb.0:
    Bcc %bb.1, 1, $cpsr
    B %bb.2

  bb.1:
    Bcc %bb.3, 0, $cpsr

  bb.2:
  successors:
    tBL 14, $cpsr, @__stack_chk_fail

  bb.3:
  successors:
    $sp = tADDspi $sp, 2, 14, _
    $sp = tADDspi $sp, 2, 14, _
    tTAILJMPdND @bar, 14, $cpsr
...

# bb.2 has no successors, presumably because __stack_chk_fail doesn't return,
# so there should be no edge from bb.2 to bb.3.
# Nevertheless, IfConversion treats bb.1, bb.2, bb.3 as a triangle and
# inserts a predicated copy of bb.2 in bb.1.

# This caused r302876 to die with a failed assertion.

# CHECK:     bb.0:
# CHECK:       successors: %bb.2(0x40000000), %bb.1(0x40000000)
# CHECK:       Bcc %bb.2, 1, $cpsr

# CHECK:     bb.1:
# CHECK-NOT:   successors: %bb
# CHECK:       tBL 14, $cpsr, @__stack_chk_fail

# CHECK:     bb.2:
# CHECK-NOT:   successors: %bb
# CHECK:       tBL 1, $cpsr, @__stack_chk_fail
# CHECK:       $sp = tADDspi $sp, 2, 14, $noreg
# CHECK:       $sp = tADDspi $sp, 2, 14, $noreg
# CHECK:       tTAILJMPdND @bar, 14, $cpsr