test/CodeGen/AMDGPU/shrink-instructions-implicit-vcclo.mir

# RUN: llc -march=amdgcn -mcpu=gfx1010 -run-pass=si-shrink-instructions --verify-machineinstrs %s -o - | FileCheck %s

# Make sure the implicit vcc_lo of V_CNDMASK is preserved and not promoted to vcc.
---

name:            shrink_cndmask_implicit_vcc_lo
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $vgpr0, $vgpr1
    ; CHECK-LABEL: name: shrink_cndmask_implicit_vcc_lo
    ; CHECK: [[COPY:%[0-9]+]]:vgpr_32 = COPY $vgpr0
    ; CHECK: [[COPY1:%[0-9]+]]:vgpr_32 = COPY $vgpr0
    ; CHECK: V_CMP_LT_I32_e32 0, [[COPY]], implicit-def $vcc_lo, implicit $exec
    ; CHECK: V_CNDMASK_B32_e32 0, [[COPY1]], implicit $vcc_lo, implicit $exec
    %0:vgpr_32 = COPY $vgpr0
    %1:vgpr_32 = COPY $vgpr0
    V_CMP_LT_I32_e32 0, %0:vgpr_32, implicit-def $vcc_lo, implicit $exec, implicit-def $vcc
    %2:vgpr_32 = V_CNDMASK_B32_e64 0, 0, 0, %1:vgpr_32, $vcc_lo, implicit $exec
    S_NOP 0

...