# RUN: llc -march=amdgcn -mcpu=tonga %s -start-before detect-dead-lanes -stop-before machine-scheduler -verify-machineinstrs -o - | FileCheck -check-prefix=GCN %s

# GCN-LABEL: name: dead_lane
# GCN:      bb.0:
# GCN-NEXT: undef %3.sub0:vreg_64 = V_MAC_F32_e32 undef %1:vgpr_32, undef %1:vgpr_32, undef %3.sub0, implicit $exec
# GCN-NEXT: FLAT_STORE_DWORD undef %4:vreg_64, %3.sub0,
---
name:            dead_lane
tracksRegLiveness: true
body:             |
  bb.0:
    %1:vgpr_32 = V_MAC_F32_e32 undef %0:vgpr_32, undef %0:vgpr_32, undef %0:vgpr_32, implicit $exec
    %2:vgpr_32 = V_MAC_F32_e32 undef %0:vgpr_32, undef %0:vgpr_32, undef %0:vgpr_32, implicit $exec
    %3:vreg_64 = REG_SEQUENCE %1:vgpr_32, %subreg.sub0, %2:vgpr_32, %subreg.sub1
    FLAT_STORE_DWORD undef %4:vreg_64, %3.sub0, 0, 0, 0, implicit $exec, implicit $flat_scr
    S_ENDPGM 0

...