# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 4
# RUN: llc -mtriple=amdgcn -mcpu=gfx1150 -mattr=+wavefrontsize32,-wavefrontsize64 -verify-machineinstrs -run-pass=amdgpu-insert-single-use-vdst %s -o - | FileCheck %s
# RUN: llc -mtriple=amdgcn -mcpu=gfx1150 -mattr=-wavefrontsize32,+wavefrontsize64 -verify-machineinstrs -run-pass=amdgpu-insert-single-use-vdst %s -o - | FileCheck %s

# One single-use producer.
---
name: one_producer
tracksRegLiveness: true
body: |
  ; CHECK-LABEL: name: one_producer
  ; CHECK: bb.0:
  ; CHECK-NEXT:   successors: %bb.1(0x80000000)
  ; CHECK-NEXT:   liveins: $vgpr0
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   S_SINGLEUSE_VDST 1
  ; CHECK-NEXT:   $vgpr1 = V_ADD_U32_e32 $vgpr0, $vgpr0, implicit $exec
  ; CHECK-NEXT:   $vgpr2 = V_ADD_U32_e32 $vgpr0, $vgpr1, implicit $exec
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.1:
  ; CHECK-NEXT:   liveins: $vgpr0, $vgpr2
  ; CHECK-NEXT: {{  $}}
  bb.0:
    liveins: $vgpr0
    $vgpr1 = V_ADD_U32_e32 $vgpr0, $vgpr0, implicit $exec
    $vgpr2 = V_ADD_U32_e32 $vgpr0, $vgpr1, implicit $exec
  bb.1:
    liveins: $vgpr0, $vgpr2
...

# One single-use producer of a 64-bit value.
---
name: one_producer_64bit
tracksRegLiveness: true
body: |
  ; CHECK-LABEL: name: one_producer_64bit
  ; CHECK: bb.0:
  ; CHECK-NEXT:   successors: %bb.1(0x80000000)
  ; CHECK-NEXT:   liveins: $vgpr0_vgpr1
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   S_SINGLEUSE_VDST 1
  ; CHECK-NEXT:   $vgpr2_vgpr3 = V_LSHLREV_B64_e64 0, $vgpr0_vgpr1, implicit $exec
  ; CHECK-NEXT:   $vgpr4_vgpr5 = V_LSHLREV_B64_e64 0, $vgpr2_vgpr3, implicit $exec
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.1:
  ; CHECK-NEXT:   liveins: $vgpr4_vgpr5
  ; CHECK-NEXT: {{  $}}
  bb.0:
    liveins: $vgpr0_vgpr1
    $vgpr2_vgpr3 = V_LSHLREV_B64_e64 0, $vgpr0_vgpr1, implicit $exec
    $vgpr4_vgpr5 = V_LSHLREV_B64_e64 0, $vgpr2_vgpr3, implicit $exec
  bb.1:
    liveins: $vgpr4_vgpr5
...

# Two consecutive single-use producers.
---
name: two_producers
tracksRegLiveness: true
body: |
  ; CHECK-LABEL: name: two_producers
  ; CHECK: bb.0:
  ; CHECK-NEXT:   successors: %bb.1(0x80000000)
  ; CHECK-NEXT:   liveins: $vgpr0
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   S_SINGLEUSE_VDST 1
  ; CHECK-NEXT:   $vgpr1 = V_ADD_U32_e32 $vgpr0, $vgpr0, implicit $exec
  ; CHECK-NEXT:   S_SINGLEUSE_VDST 1
  ; CHECK-NEXT:   $vgpr2 = V_ADD_U32_e32 $vgpr0, $vgpr1, implicit $exec
  ; CHECK-NEXT:   $vgpr3 = V_ADD_U32_e32 $vgpr0, $vgpr2, implicit $exec
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.1:
  ; CHECK-NEXT:   liveins: $vgpr0, $vgpr3
  ; CHECK-NEXT: {{  $}}
  bb.0:
    liveins: $vgpr0
    $vgpr1 = V_ADD_U32_e32 $vgpr0, $vgpr0, implicit $exec
    $vgpr2 = V_ADD_U32_e32 $vgpr0, $vgpr1, implicit $exec
    $vgpr3 = V_ADD_U32_e32 $vgpr0, $vgpr2, implicit $exec
  bb.1:
    liveins: $vgpr0, $vgpr3
...

# Redefinitions of v0.
---
name: redefinitions
tracksRegLiveness: true
body: |
  ; CHECK-LABEL: name: redefinitions
  ; CHECK: bb.0:
  ; CHECK-NEXT:   successors: %bb.1(0x80000000)
  ; CHECK-NEXT:   liveins: $vgpr0
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   S_SINGLEUSE_VDST 1
  ; CHECK-NEXT:   $vgpr0 = V_MOV_B32_e32 $vgpr0, implicit $exec
  ; CHECK-NEXT:   S_SINGLEUSE_VDST 1
  ; CHECK-NEXT:   $vgpr0 = V_MOV_B32_e32 $vgpr0, implicit $exec
  ; CHECK-NEXT:   S_SINGLEUSE_VDST 1
  ; CHECK-NEXT:   $vgpr0 = V_MOV_B32_e32 $vgpr0, implicit $exec
  ; CHECK-NEXT:   S_SINGLEUSE_VDST 1
  ; CHECK-NEXT:   $vgpr0 = V_MOV_B32_e32 $vgpr0, implicit $exec
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.1:
  bb.0:
    liveins: $vgpr0
    $vgpr0 = V_MOV_B32_e32 $vgpr0, implicit $exec
    $vgpr0 = V_MOV_B32_e32 $vgpr0, implicit $exec
    $vgpr0 = V_MOV_B32_e32 $vgpr0, implicit $exec
    $vgpr0 = V_MOV_B32_e32 $vgpr0, implicit $exec
  bb.1:
...

# One producer with no consumers.
---
name: no_consumer
tracksRegLiveness: true
body: |
  ; CHECK-LABEL: name: no_consumer
  ; CHECK: bb.0:
  ; CHECK-NEXT:   successors: %bb.1(0x80000000)
  ; CHECK-NEXT:   liveins: $vgpr0
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   S_SINGLEUSE_VDST 1
  ; CHECK-NEXT:   $vgpr1 = V_ADD_U32_e32 $vgpr0, $vgpr0, implicit $exec
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.1:
  bb.0:
    liveins: $vgpr0
    $vgpr1 = V_ADD_U32_e32 $vgpr0, $vgpr0, implicit $exec
  bb.1:
...

# One consumer with two uses of the same value.
---
name: one_consumer_two_uses
tracksRegLiveness: true
body: |
  ; CHECK-LABEL: name: one_consumer_two_uses
  ; CHECK: bb.0:
  ; CHECK-NEXT:   successors: %bb.1(0x80000000)
  ; CHECK-NEXT:   liveins: $vgpr0
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   $vgpr1 = V_MOV_B32_e32 $vgpr0, implicit $exec
  ; CHECK-NEXT:   $vgpr2 = V_ADD_U32_e32 $vgpr1, $vgpr1, implicit $exec
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.1:
  ; CHECK-NEXT:   liveins: $vgpr0, $vgpr2
  ; CHECK-NEXT: {{  $}}
  bb.0:
    liveins: $vgpr0
    $vgpr1 = V_MOV_B32_e32 $vgpr0, implicit $exec
    $vgpr2 = V_ADD_U32_e32 $vgpr1, $vgpr1, implicit $exec
  bb.1:
    liveins: $vgpr0, $vgpr2
...

# A longer example.
---
name: longer_example
tracksRegLiveness: true
body: |
  ; CHECK-LABEL: name: longer_example
  ; CHECK: bb.0:
  ; CHECK-NEXT:   successors: %bb.1(0x80000000)
  ; CHECK-NEXT:   liveins: $vgpr3, $vgpr5, $sgpr0, $sgpr2, $sgpr4, $sgpr5, $sgpr16, $sgpr17, $sgpr18, $sgpr19
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   S_SINGLEUSE_VDST 1
  ; CHECK-NEXT:   $vgpr14 = V_MUL_F32_e32 $sgpr4, $vgpr3, implicit $exec, implicit $mode
  ; CHECK-NEXT:   $sgpr3 = S_MUL_F16 $sgpr0, $sgpr2, implicit $mode
  ; CHECK-NEXT:   S_SINGLEUSE_VDST 1
  ; CHECK-NEXT:   $vgpr15 = V_MUL_F32_e32 $sgpr5, $vgpr3, implicit $exec, implicit $mode
  ; CHECK-NEXT:   $vgpr17 = V_FMA_F32_e64 0, $sgpr16, 0, $vgpr5, 0, $vgpr14, 0, 0, implicit $exec, implicit $mode
  ; CHECK-NEXT:   $sgpr1 = S_ADD_F16 $sgpr0, 15360, implicit $mode
  ; CHECK-NEXT:   S_SINGLEUSE_VDST 1
  ; CHECK-NEXT:   $vgpr15 = V_FMA_F32_e64 0, $sgpr17, 0, $vgpr5, 0, $vgpr15, 0, 0, implicit $exec, implicit $mode
  ; CHECK-NEXT:   S_SINGLEUSE_VDST 1
  ; CHECK-NEXT:   $vgpr14 = V_FMA_F32_e64 0, $sgpr18, 0, $vgpr15, 0, $vgpr17, 0, 0, implicit $exec, implicit $mode
  ; CHECK-NEXT:   $vgpr15 = V_FMA_F32_e64 0, $sgpr19, 0, $vgpr14, 0, $vgpr17, 0, 0, implicit $exec, implicit $mode
  ; CHECK-NEXT:   $vgpr16 = V_LOG_F32_e32 $vgpr15, implicit $exec, implicit $mode
  ; CHECK-NEXT:   $vgpr18 = V_EXP_F32_e32 $vgpr15, implicit $exec, implicit $mode
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.1:
  ; CHECK-NEXT:   liveins: $vgpr16, $vgpr18
  ; CHECK-NEXT: {{  $}}
  bb.0:
    liveins: $vgpr3, $vgpr5, $sgpr0, $sgpr2, $sgpr4, $sgpr5, $sgpr16, $sgpr17, $sgpr18, $sgpr19
    $vgpr14 = V_MUL_F32_e32 $sgpr4, $vgpr3, implicit $exec, implicit $mode
    $sgpr3 = S_MUL_F16 $sgpr0, $sgpr2, implicit $mode
    $vgpr15 = V_MUL_F32_e32 $sgpr5, $vgpr3, implicit $exec, implicit $mode
    $vgpr17 = V_FMA_F32_e64 0, $sgpr16, 0, $vgpr5, 0, $vgpr14, 0, 0, implicit $exec, implicit $mode
    $sgpr1 = S_ADD_F16 $sgpr0, 15360, implicit $mode
    $vgpr15 = V_FMA_F32_e64 0, $sgpr17, 0, $vgpr5, 0, $vgpr15, 0, 0, implicit $exec, implicit $mode
    $vgpr14 = V_FMA_F32_e64 0, $sgpr18, 0, $vgpr15, 0, $vgpr17, 0, 0, implicit $exec, implicit $mode
    $vgpr15 = V_FMA_F32_e64 0, $sgpr19, 0, $vgpr14, 0, $vgpr17, 0, 0, implicit $exec, implicit $mode
    $vgpr16 = V_LOG_F32_e32 $vgpr15, implicit $exec, implicit $mode
    $vgpr18 = V_EXP_F32_e32 $vgpr15, implicit $exec, implicit $mode
  bb.1:
    liveins: $vgpr16, $vgpr18
...

# Multiple uses of v0.
---
name: multiple_uses_1
tracksRegLiveness: true
body: |
  ; CHECK-LABEL: name: multiple_uses_1
  ; CHECK: bb.0:
  ; CHECK-NEXT:   successors: %bb.1(0x80000000)
  ; CHECK-NEXT:   liveins: $vgpr0
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   $vgpr0 = V_MOV_B32_e32 $vgpr0, implicit $exec
  ; CHECK-NEXT:   $vgpr1 = V_MOV_B32_e32 $vgpr0, implicit $exec
  ; CHECK-NEXT:   $vgpr2 = V_MOV_B32_e32 $vgpr0, implicit $exec
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.1:
  ; CHECK-NEXT:   liveins: $vgpr1, $vgpr2
  ; CHECK-NEXT: {{  $}}
  bb.0:
    liveins: $vgpr0
    $vgpr0 = V_MOV_B32_e32 $vgpr0, implicit $exec
    $vgpr1 = V_MOV_B32_e32 $vgpr0, implicit $exec
    $vgpr2 = V_MOV_B32_e32 $vgpr0, implicit $exec
  bb.1:
    liveins: $vgpr1, $vgpr2
...

# Multiple uses of v0 and redefinitions of v1 and v2.
---
name: multiple_uses_2
tracksRegLiveness: true
body: |
  ; CHECK-LABEL: name: multiple_uses_2
  ; CHECK: bb.0:
  ; CHECK-NEXT:   successors: %bb.1(0x80000000)
  ; CHECK-NEXT:   liveins: $vgpr0
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   $vgpr0 = V_MOV_B32_e32 $vgpr0, implicit $exec
  ; CHECK-NEXT:   S_SINGLEUSE_VDST 1
  ; CHECK-NEXT:   $vgpr1 = V_MOV_B32_e32 $vgpr0, implicit $exec
  ; CHECK-NEXT:   S_SINGLEUSE_VDST 1
  ; CHECK-NEXT:   $vgpr2 = V_MOV_B32_e32 $vgpr0, implicit $exec
  ; CHECK-NEXT:   $vgpr0 = V_MOV_B32_e32 $vgpr0, implicit $exec
  ; CHECK-NEXT:   $vgpr1 = V_MOV_B32_e32 $vgpr0, implicit $exec
  ; CHECK-NEXT:   $vgpr2 = V_MOV_B32_e32 $vgpr0, implicit $exec
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.1:
  ; CHECK-NEXT:   liveins: $vgpr1, $vgpr2
  ; CHECK-NEXT: {{  $}}
  bb.0:
    liveins: $vgpr0
    $vgpr0 = V_MOV_B32_e32 $vgpr0, implicit $exec
    $vgpr1 = V_MOV_B32_e32 $vgpr0, implicit $exec
    $vgpr2 = V_MOV_B32_e32 $vgpr0, implicit $exec
    $vgpr0 = V_MOV_B32_e32 $vgpr0, implicit $exec
    $vgpr1 = V_MOV_B32_e32 $vgpr0, implicit $exec
    $vgpr2 = V_MOV_B32_e32 $vgpr0, implicit $exec
  bb.1:
    liveins: $vgpr1, $vgpr2
...

# Multiple uses of all but v1.
---
name: multiple_uses_3
tracksRegLiveness: true
body: |
  ; CHECK-LABEL: name: multiple_uses_3
  ; CHECK: bb.0:
  ; CHECK-NEXT:   successors: %bb.1(0x80000000)
  ; CHECK-NEXT:   liveins: $vgpr0
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   $vgpr0 = V_MOV_B32_e32 $vgpr0, implicit $exec
  ; CHECK-NEXT:   S_SINGLEUSE_VDST 1
  ; CHECK-NEXT:   $vgpr1 = V_MOV_B32_e32 $vgpr0, implicit $exec
  ; CHECK-NEXT:   $vgpr2 = V_MOV_B32_e32 $vgpr0, implicit $exec
  ; CHECK-NEXT:   $vgpr3 = V_MOV_B32_e32 $vgpr1, implicit $exec
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.1:
  ; CHECK-NEXT:   liveins: $vgpr2, $vgpr3
  ; CHECK-NEXT: {{  $}}
  bb.0:
    liveins: $vgpr0
    $vgpr0 = V_MOV_B32_e32 $vgpr0, implicit $exec
    $vgpr1 = V_MOV_B32_e32 $vgpr0, implicit $exec
    $vgpr2 = V_MOV_B32_e32 $vgpr0, implicit $exec
    $vgpr3 = V_MOV_B32_e32 $vgpr1, implicit $exec
  bb.1:
    liveins: $vgpr2, $vgpr3
...

# Results are live-in to another basic block.
---
name: basic_block_1
tracksRegLiveness: true
body: |
  ; CHECK-LABEL: name: basic_block_1
  ; CHECK: bb.0:
  ; CHECK-NEXT:   successors: %bb.1(0x80000000)
  ; CHECK-NEXT:   liveins: $vgpr0
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   $vgpr0 = V_MOV_B32_e32 $vgpr0, implicit $exec
  ; CHECK-NEXT:   $vgpr1 = V_MOV_B32_e32 $vgpr0, implicit $exec
  ; CHECK-NEXT:   $vgpr2 = V_MOV_B32_e32 $vgpr0, implicit $exec
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.1:
  ; CHECK-NEXT:   successors: %bb.2(0x80000000)
  ; CHECK-NEXT:   liveins: $vgpr0, $vgpr1, $vgpr2
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   $vgpr0 = V_MOV_B32_e32 $vgpr0, implicit $exec
  ; CHECK-NEXT:   $vgpr1 = V_MOV_B32_e32 $vgpr0, implicit $exec
  ; CHECK-NEXT:   $vgpr2 = V_MOV_B32_e32 $vgpr0, implicit $exec
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.2:
  ; CHECK-NEXT:   liveins: $vgpr1, $vgpr2
  ; CHECK-NEXT: {{  $}}
  bb.0:
    liveins: $vgpr0
    $vgpr0 = V_MOV_B32_e32 $vgpr0, implicit $exec
    $vgpr1 = V_MOV_B32_e32 $vgpr0, implicit $exec
    $vgpr2 = V_MOV_B32_e32 $vgpr0, implicit $exec
  bb.1:
    liveins: $vgpr0, $vgpr1, $vgpr2
    $vgpr0 = V_MOV_B32_e32 $vgpr0, implicit $exec
    $vgpr1 = V_MOV_B32_e32 $vgpr0, implicit $exec
    $vgpr2 = V_MOV_B32_e32 $vgpr0, implicit $exec
  bb.2:
    liveins: $vgpr1, $vgpr2
...

# Result v2 has multiple uses in another basic block.
---
name: basic_block_2
tracksRegLiveness: true
body: |
  ; CHECK-LABEL: name: basic_block_2
  ; CHECK: bb.0:
  ; CHECK-NEXT:   successors: %bb.1(0x80000000)
  ; CHECK-NEXT:   liveins: $vgpr0, $vgpr1
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   $vgpr2 = V_MOV_B32_e32 $vgpr1, implicit $exec
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.1:
  ; CHECK-NEXT:   successors: %bb.2(0x80000000)
  ; CHECK-NEXT:   liveins: $vgpr2
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   S_SINGLEUSE_VDST 1
  ; CHECK-NEXT:   $vgpr3 = V_MOV_B32_e32 $vgpr2, implicit $exec
  ; CHECK-NEXT:   $vgpr3 = V_MOV_B32_e32 $vgpr2, implicit $exec
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.2:
  ; CHECK-NEXT:   liveins: $vgpr3
  ; CHECK-NEXT: {{  $}}
  bb.0:
    liveins: $vgpr0, $vgpr1
    $vgpr2 = V_MOV_B32_e32 $vgpr1, implicit $exec
  bb.1:
    liveins: $vgpr2
    $vgpr3 = V_MOV_B32_e32 $vgpr2, implicit $exec
    $vgpr3 = V_MOV_B32_e32 $vgpr2, implicit $exec
  bb.2:
    liveins: $vgpr3
...

# Results are redefined in another basic block.
---
name: basic_block_3
tracksRegLiveness: true
body: |
  ; CHECK-LABEL: name: basic_block_3
  ; CHECK: bb.0:
  ; CHECK-NEXT:   successors: %bb.1(0x80000000)
  ; CHECK-NEXT:   liveins: $vgpr0
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   $vgpr0 = V_MOV_B32_e32 $vgpr0, implicit $exec
  ; CHECK-NEXT:   $vgpr1 = V_MOV_B32_e32 $vgpr0, implicit $exec
  ; CHECK-NEXT:   S_SINGLEUSE_VDST 1
  ; CHECK-NEXT:   $vgpr2 = V_MOV_B32_e32 $vgpr0, implicit $exec
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.1:
  ; CHECK-NEXT:   successors: %bb.2(0x80000000)
  ; CHECK-NEXT:   liveins: $vgpr0, $vgpr1
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   $vgpr0 = V_ADD_U32_e32 $vgpr0, $vgpr1, implicit $exec
  ; CHECK-NEXT:   $vgpr1 = V_ADD_U32_e32 $vgpr0, $vgpr1, implicit $exec
  ; CHECK-NEXT:   $vgpr2 = V_ADD_U32_e32 $vgpr0, $vgpr1, implicit $exec
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.2:
  ; CHECK-NEXT:   liveins: $vgpr0, $vgpr1, $vgpr2
  ; CHECK-NEXT: {{  $}}
  bb.0:
    liveins: $vgpr0
    $vgpr0 = V_MOV_B32_e32 $vgpr0, implicit $exec
    $vgpr1 = V_MOV_B32_e32 $vgpr0, implicit $exec
    $vgpr2 = V_MOV_B32_e32 $vgpr0, implicit $exec
  bb.1:
    liveins: $vgpr0, $vgpr1
    $vgpr0 = V_ADD_U32_e32 $vgpr0, $vgpr1, implicit $exec
    $vgpr1 = V_ADD_U32_e32 $vgpr0, $vgpr1, implicit $exec
    $vgpr2 = V_ADD_U32_e32 $vgpr0, $vgpr1, implicit $exec
  bb.2:
    liveins: $vgpr0, $vgpr1, $vgpr2
...

# Exec modified between producer and consumer.
---
name: exec_mask
tracksRegLiveness: true
body: |
  ; CHECK-LABEL: name: exec_mask
  ; CHECK: bb.0:
  ; CHECK-NEXT:   successors: %bb.1(0x80000000)
  ; CHECK-NEXT:   liveins: $sgpr0_sgpr1
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   S_SINGLEUSE_VDST 1
  ; CHECK-NEXT:   $vgpr0 = V_MOV_B32_e32 0, implicit $exec
  ; CHECK-NEXT:   $exec = COPY $sgpr0_sgpr1
  ; CHECK-NEXT:   $vgpr0 = V_MOV_B32_e32 $vgpr0, implicit $exec
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.1:
  ; CHECK-NEXT:   liveins: $vgpr0
  ; CHECK-NEXT: {{  $}}
  bb.0:
    liveins: $sgpr0_sgpr1
    $vgpr0 = V_MOV_B32_e32 0, implicit $exec
    $exec = COPY $sgpr0_sgpr1
    $vgpr0 = V_MOV_B32_e32 $vgpr0, implicit $exec
  bb.1:
    liveins: $vgpr0
...

# Exec_lo modified between producer and consumer.
---
name: exec_mask_lo
tracksRegLiveness: true
body: |
  ; CHECK-LABEL: name: exec_mask_lo
  ; CHECK: bb.0:
  ; CHECK-NEXT:   successors: %bb.1(0x80000000)
  ; CHECK-NEXT:   liveins: $sgpr0
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   S_SINGLEUSE_VDST 1
  ; CHECK-NEXT:   $vgpr0 = V_MOV_B32_e32 0, implicit $exec
  ; CHECK-NEXT:   $exec_lo = COPY $sgpr0
  ; CHECK-NEXT:   $vgpr0 = V_MOV_B32_e32 $vgpr0, implicit $exec
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.1:
  ; CHECK-NEXT:   liveins: $vgpr0
  ; CHECK-NEXT: {{  $}}
  bb.0:
    liveins: $sgpr0
    $vgpr0 = V_MOV_B32_e32 0, implicit $exec
    $exec_lo = COPY $sgpr0
    $vgpr0 = V_MOV_B32_e32 $vgpr0, implicit $exec
  bb.1:
    liveins: $vgpr0
...

# Exec_hi modified between producer and consumer.
---
name: exec_mask_hi
tracksRegLiveness: true
body: |
  ; CHECK-LABEL: name: exec_mask_hi
  ; CHECK: bb.0:
  ; CHECK-NEXT:   successors: %bb.1(0x80000000)
  ; CHECK-NEXT:   liveins: $sgpr0
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   S_SINGLEUSE_VDST 1
  ; CHECK-NEXT:   $vgpr0 = V_MOV_B32_e32 0, implicit $exec
  ; CHECK-NEXT:   $exec_hi = COPY $sgpr0
  ; CHECK-NEXT:   $vgpr0 = V_MOV_B32_e32 $vgpr0, implicit $exec
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.1:
  ; CHECK-NEXT:   liveins: $vgpr0
  ; CHECK-NEXT: {{  $}}
  bb.0:
    liveins: $sgpr0
    $vgpr0 = V_MOV_B32_e32 0, implicit $exec
    $exec_hi = COPY $sgpr0
    $vgpr0 = V_MOV_B32_e32 $vgpr0, implicit $exec
  bb.1:
    liveins: $vgpr0
...

# Write 32-bit vgpr and then read from low 16 bits.
---
name: write_full_read_lo
tracksRegLiveness: true
body: |
  ; CHECK-LABEL: name: write_full_read_lo
  ; CHECK: bb.0:
  ; CHECK-NEXT:   successors: %bb.1(0x80000000)
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   S_SINGLEUSE_VDST 1
  ; CHECK-NEXT:   $vgpr0 = V_MOV_B32_e32 0, implicit $exec
  ; CHECK-NEXT:   $vgpr1_lo16 = V_MOV_B16_t16_e32 $vgpr0_lo16, implicit $exec
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.1:
  ; CHECK-NEXT:   liveins: $vgpr1_lo16
  ; CHECK-NEXT: {{  $}}
  bb.0:
    $vgpr0 = V_MOV_B32_e32 0, implicit $exec
    $vgpr1_lo16 = V_MOV_B16_t16_e32 $vgpr0_lo16, implicit $exec
  bb.1:
    liveins: $vgpr1_lo16
...

# Write 32-bit vgpr and then read from high 16 bits.
---
name: write_full_read_hi
tracksRegLiveness: true
body: |
  ; CHECK-LABEL: name: write_full_read_hi
  ; CHECK: bb.0:
  ; CHECK-NEXT:   successors: %bb.1(0x80000000)
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   S_SINGLEUSE_VDST 1
  ; CHECK-NEXT:   $vgpr0 = V_MOV_B32_e32 0, implicit $exec
  ; CHECK-NEXT:   $vgpr1_hi16 = V_MOV_B16_t16_e32 $vgpr0_hi16, implicit $exec
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.1:
  ; CHECK-NEXT:   liveins: $vgpr1_hi16
  ; CHECK-NEXT: {{  $}}
  bb.0:
    $vgpr0 = V_MOV_B32_e32 0, implicit $exec
    $vgpr1_hi16 = V_MOV_B16_t16_e32 $vgpr0_hi16, implicit $exec
  bb.1:
    liveins: $vgpr1_hi16
...

# Write 32-bit vgpr and then read from both halves.
---
name: write_full_read_both
tracksRegLiveness: true
body: |
  ; CHECK-LABEL: name: write_full_read_both
  ; CHECK: bb.0:
  ; CHECK-NEXT:   successors: %bb.1(0x80000000)
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   S_SINGLEUSE_VDST 1
  ; CHECK-NEXT:   $vgpr0 = V_MOV_B32_e32 0, implicit $exec
  ; CHECK-NEXT:   S_SINGLEUSE_VDST 1
  ; CHECK-NEXT:   $vgpr1_lo16 = V_MOV_B16_t16_e32 $vgpr0_lo16, implicit $exec
  ; CHECK-NEXT:   S_SINGLEUSE_VDST 1
  ; CHECK-NEXT:   $vgpr1_hi16 = V_MOV_B16_t16_e32 $vgpr0_hi16, implicit $exec
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.1:
  ; CHECK-NEXT:   liveins: $vgpr1
  ; CHECK-NEXT: {{  $}}
  bb.0:
    $vgpr0 = V_MOV_B32_e32 0, implicit $exec
    $vgpr1_lo16 = V_MOV_B16_t16_e32 $vgpr0_lo16, implicit $exec
    $vgpr1_hi16 = V_MOV_B16_t16_e32 $vgpr0_hi16, implicit $exec
  bb.1:
    liveins: $vgpr1
...

# Write 32-bit vgpr and then read from both halves in the same instruction.
---
name: write_full_read_both_same_instruction
tracksRegLiveness: true
body: |
  ; CHECK-LABEL: name: write_full_read_both_same_instruction
  ; CHECK: bb.0:
  ; CHECK-NEXT:   successors: %bb.1(0x80000000)
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   S_SINGLEUSE_VDST 1
  ; CHECK-NEXT:   $vgpr0 = V_MOV_B32_e32 0, implicit $exec
  ; CHECK-NEXT:   $vgpr1_lo16 = V_ADD_F16_t16_e32 $vgpr0_lo16, $vgpr0_hi16, implicit $mode, implicit $exec
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.1:
  ; CHECK-NEXT:   liveins: $vgpr1_lo16
  ; CHECK-NEXT: {{  $}}
  bb.0:
    $vgpr0 = V_MOV_B32_e32 0, implicit $exec
    $vgpr1_lo16 = V_ADD_F16_t16_e32 $vgpr0_lo16, $vgpr0_hi16, implicit $mode, implicit $exec
  bb.1:
    liveins: $vgpr1_lo16
...

# Write low 16-bits and then read 32-bit vgpr.
---
name: write_lo_read_full
tracksRegLiveness: true
body: |
  ; CHECK-LABEL: name: write_lo_read_full
  ; CHECK: bb.0:
  ; CHECK-NEXT:   successors: %bb.1(0x80000000)
  ; CHECK-NEXT:   liveins: $vgpr0
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   S_SINGLEUSE_VDST 1
  ; CHECK-NEXT:   $vgpr0_lo16 = V_MOV_B16_t16_e32 0, implicit $exec
  ; CHECK-NEXT:   $vgpr1 = V_MOV_B32_e32 $vgpr0, implicit $exec
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.1:
  ; CHECK-NEXT:   liveins: $vgpr1
  ; CHECK-NEXT: {{  $}}
  bb.0:
    liveins: $vgpr0
    $vgpr0_lo16 = V_MOV_B16_t16_e32 0, implicit $exec
    $vgpr1 = V_MOV_B32_e32 $vgpr0, implicit $exec
  bb.1:
    liveins: $vgpr1
...

# Write high 16-bits and then read 32-bit vgpr.
---
name: write_hi_read_full
tracksRegLiveness: true
body: |
  ; CHECK-LABEL: name: write_hi_read_full
  ; CHECK: bb.0:
  ; CHECK-NEXT:   successors: %bb.1(0x80000000)
  ; CHECK-NEXT:   liveins: $vgpr0
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT:   S_SINGLEUSE_VDST 1
  ; CHECK-NEXT:   $vgpr0_hi16 = V_MOV_B16_t16_e32 0, implicit $exec
  ; CHECK-NEXT:   $vgpr1 = V_MOV_B32_e32 $vgpr0, implicit $exec
  ; CHECK-NEXT: {{  $}}
  ; CHECK-NEXT: bb.1:
  ; CHECK-NEXT:   liveins: $vgpr1
  ; CHECK-NEXT: {{  $}}
  bb.0:
    liveins: $vgpr0
    $vgpr0_hi16 = V_MOV_B16_t16_e32 0, implicit $exec
    $vgpr1 = V_MOV_B32_e32 $vgpr0, implicit $exec
  bb.1:
    liveins: $vgpr1
...