# RUN: not --crash llc -mtriple=amdgcn -run-pass=none -verify-machineinstrs -filetype=null %s 2>&1 | FileCheck %s
---
name:            region_nesting
body:             |
  bb.0:
    %0:sgpr_64 = CONVERGENCECTRL_ANCHOR
    %1:sgpr_64 = CONVERGENCECTRL_ANCHOR
    %2:sgpr_64 = IMPLICIT_DEF
    %3:sgpr_64 = SI_CALL %2, 1, implicit %0:sgpr_64
    ; CHECK: Convergence region is not well-nested.
    ; CHECK: SI_CALL %{{[0-9]}}:sgpr_64, 2
    %4:sgpr_64 = SI_CALL %2, 2, implicit %1:sgpr_64
    S_CBRANCH_EXECZ %bb.1, implicit $exec
    S_BRANCH %bb.2

  bb.1:
    %5:sgpr_64 = SI_CALL %2, 3, implicit %0:sgpr_64

  bb.2:
    ; CHECK: Convergence region is not well-nested.
    ; CHECK: SI_CALL %{{[0-9]}}:sgpr_64, 4
    %6:sgpr_64 = SI_CALL %2, 4, implicit %1:sgpr_64

...