combine-fdiv-sqrt-to-rsq.mir | Explore in Territory

# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 4
# RUN: llc -mtriple=amdgcn -mcpu=gfx1010 -run-pass=amdgpu-postlegalizer-combiner -verify-machineinstrs %s -o - | FileCheck -check-prefix=GCN %s

---
name:            rsq_f16
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $vgpr0

    ; GCN-LABEL: name: rsq_f16
    ; GCN: liveins: $vgpr0
    ; GCN-NEXT: {{  $}}
    ; GCN-NEXT: [[COPY:%[0-9]+]]:_(s32) = COPY $vgpr0
    ; GCN-NEXT: %x:_(s16) = G_TRUNC [[COPY]](s32)
    ; GCN-NEXT: [[INT:%[0-9]+]]:_(s16) = contract G_INTRINSIC intrinsic(@llvm.amdgcn.rsq), %x(s16)
    ; GCN-NEXT: %ext:_(s32) = G_ANYEXT [[INT]](s16)
    ; GCN-NEXT: $vgpr0 = COPY %ext(s32)
    %0:_(s32) = COPY $vgpr0
    %x:_(s16) = G_TRUNC %0:_(s32)
    %sqrt:_(s16) = contract G_FSQRT %x
    %one:_(s16) = G_FCONSTANT half 1.0
    %rsq:_(s16) = contract G_FDIV %one, %sqrt
    %ext:_(s32) = G_ANYEXT %rsq:_(s16)
    $vgpr0 = COPY %ext

...

---
name:            rsq_f16_missing_contract0
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $vgpr0

    ; GCN-LABEL: name: rsq_f16_missing_contract0
    ; GCN: liveins: $vgpr0
    ; GCN-NEXT: {{  $}}
    ; GCN-NEXT: [[COPY:%[0-9]+]]:_(s32) = COPY $vgpr0
    ; GCN-NEXT: %x:_(s16) = G_TRUNC [[COPY]](s32)
    ; GCN-NEXT: %sqrt:_(s16) = G_FSQRT %x
    ; GCN-NEXT: %one:_(s16) = G_FCONSTANT half 0xH3C00
    ; GCN-NEXT: %rsq:_(s16) = contract G_FDIV %one, %sqrt
    ; GCN-NEXT: %ext:_(s32) = G_ANYEXT %rsq(s16)
    ; GCN-NEXT: $vgpr0 = COPY %ext(s32)
    %0:_(s32) = COPY $vgpr0
    %x:_(s16) = G_TRUNC %0:_(s32)
    %sqrt:_(s16) = G_FSQRT %x
    %one:_(s16) = G_FCONSTANT half 1.0
    %rsq:_(s16) = contract G_FDIV %one, %sqrt
    %ext:_(s32) = G_ANYEXT %rsq:_(s16)
    $vgpr0 = COPY %ext

...

---
name:            rsq_f16_missing_contract1
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $vgpr0

    ; GCN-LABEL: name: rsq_f16_missing_contract1
    ; GCN: liveins: $vgpr0
    ; GCN-NEXT: {{  $}}
    ; GCN-NEXT: [[COPY:%[0-9]+]]:_(s32) = COPY $vgpr0
    ; GCN-NEXT: %x:_(s16) = G_TRUNC [[COPY]](s32)
    ; GCN-NEXT: %sqrt:_(s16) = contract G_FSQRT %x
    ; GCN-NEXT: %one:_(s16) = G_FCONSTANT half 0xH3C00
    ; GCN-NEXT: %rsq:_(s16) = G_FDIV %one, %sqrt
    ; GCN-NEXT: %ext:_(s32) = G_ANYEXT %rsq(s16)
    ; GCN-NEXT: $vgpr0 = COPY %ext(s32)
    %0:_(s32) = COPY $vgpr0
    %x:_(s16) = G_TRUNC %0:_(s32)
    %sqrt:_(s16) = contract G_FSQRT %x
    %one:_(s16) = G_FCONSTANT half 1.0
    %rsq:_(s16) = G_FDIV %one, %sqrt
    %ext:_(s32) = G_ANYEXT %rsq:_(s16)
    $vgpr0 = COPY %ext

...

---
name:            neg_rsq_f16
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $vgpr0

    ; GCN-LABEL: name: neg_rsq_f16
    ; GCN: liveins: $vgpr0
    ; GCN-NEXT: {{  $}}
    ; GCN-NEXT: [[COPY:%[0-9]+]]:_(s32) = COPY $vgpr0
    ; GCN-NEXT: %x:_(s16) = G_TRUNC [[COPY]](s32)
    ; GCN-NEXT: [[INT:%[0-9]+]]:_(s16) = contract G_INTRINSIC intrinsic(@llvm.amdgcn.rsq), %x(s16)
    ; GCN-NEXT: %rsq:_(s16) = contract G_FNEG [[INT]]
    ; GCN-NEXT: %ext:_(s32) = G_ANYEXT %rsq(s16)
    ; GCN-NEXT: $vgpr0 = COPY %ext(s32)
    %0:_(s32) = COPY $vgpr0
    %x:_(s16) = G_TRUNC %0:_(s32)
    %sqrt:_(s16) = contract G_FSQRT %x
    %neg_one:_(s16) = G_FCONSTANT half -1.0
    %rsq:_(s16) = contract G_FDIV %neg_one, %sqrt
    %ext:_(s32) = G_ANYEXT %rsq:_(s16)
    $vgpr0 = COPY %ext

...

---
name:            neg_rsq_f16_missing_contract0
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $vgpr0

    ; GCN-LABEL: name: neg_rsq_f16_missing_contract0
    ; GCN: liveins: $vgpr0
    ; GCN-NEXT: {{  $}}
    ; GCN-NEXT: [[COPY:%[0-9]+]]:_(s32) = COPY $vgpr0
    ; GCN-NEXT: %x:_(s16) = G_TRUNC [[COPY]](s32)
    ; GCN-NEXT: %sqrt:_(s16) = G_FSQRT %x
    ; GCN-NEXT: %neg_one:_(s16) = G_FCONSTANT half 0xHBC00
    ; GCN-NEXT: %rsq:_(s16) = contract G_FDIV %neg_one, %sqrt
    ; GCN-NEXT: %ext:_(s32) = G_ANYEXT %rsq(s16)
    ; GCN-NEXT: $vgpr0 = COPY %ext(s32)
    %0:_(s32) = COPY $vgpr0
    %x:_(s16) = G_TRUNC %0:_(s32)
    %sqrt:_(s16) = G_FSQRT %x
    %neg_one:_(s16) = G_FCONSTANT half -1.0
    %rsq:_(s16) = contract G_FDIV %neg_one, %sqrt
    %ext:_(s32) = G_ANYEXT %rsq:_(s16)
    $vgpr0 = COPY %ext

...

---
name:            neg_rsq_f16_missing_contract1
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $vgpr0

    ; GCN-LABEL: name: neg_rsq_f16_missing_contract1
    ; GCN: liveins: $vgpr0
    ; GCN-NEXT: {{  $}}
    ; GCN-NEXT: [[COPY:%[0-9]+]]:_(s32) = COPY $vgpr0
    ; GCN-NEXT: %x:_(s16) = G_TRUNC [[COPY]](s32)
    ; GCN-NEXT: %sqrt:_(s16) = contract G_FSQRT %x
    ; GCN-NEXT: %neg_one:_(s16) = G_FCONSTANT half 0xHBC00
    ; GCN-NEXT: %rsq:_(s16) = G_FDIV %neg_one, %sqrt
    ; GCN-NEXT: %ext:_(s32) = G_ANYEXT %rsq(s16)
    ; GCN-NEXT: $vgpr0 = COPY %ext(s32)
    %0:_(s32) = COPY $vgpr0
    %x:_(s16) = G_TRUNC %0:_(s32)
    %sqrt:_(s16) = contract G_FSQRT %x
    %neg_one:_(s16) = G_FCONSTANT half -1.0
    %rsq:_(s16) = G_FDIV %neg_one, %sqrt
    %ext:_(s32) = G_ANYEXT %rsq:_(s16)
    $vgpr0 = COPY %ext

...

---
name:            rsq_f16_multi_use
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $vgpr0

    ; GCN-LABEL: name: rsq_f16_multi_use
    ; GCN: liveins: $vgpr0
    ; GCN-NEXT: {{  $}}
    ; GCN-NEXT: [[COPY:%[0-9]+]]:_(s32) = COPY $vgpr0
    ; GCN-NEXT: %x:_(s16) = G_TRUNC [[COPY]](s32)
    ; GCN-NEXT: %sqrt:_(s16) = contract G_FSQRT %x
    ; GCN-NEXT: %one:_(s16) = G_FCONSTANT half 0xH3C00
    ; GCN-NEXT: %rsq:_(s16) = contract G_FDIV %one, %sqrt
    ; GCN-NEXT: %ext:_(s32) = G_ANYEXT %rsq(s16)
    ; GCN-NEXT: $vgpr0 = COPY %ext(s32)
    ; GCN-NEXT: S_ENDPGM 0, implicit %sqrt(s16)
    %0:_(s32) = COPY $vgpr0
    %x:_(s16) = G_TRUNC %0:_(s32)
    %sqrt:_(s16) = contract G_FSQRT %x
    %one:_(s16) = G_FCONSTANT half 1.0
    %rsq:_(s16) = contract G_FDIV %one, %sqrt
    %ext:_(s32) = G_ANYEXT %rsq:_(s16)
    $vgpr0 = COPY %ext
    S_ENDPGM 0, implicit %sqrt

...

---
name:            rsq_f16_multi_use_missing_contract0
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $vgpr0

    ; GCN-LABEL: name: rsq_f16_multi_use_missing_contract0
    ; GCN: liveins: $vgpr0
    ; GCN-NEXT: {{  $}}
    ; GCN-NEXT: [[COPY:%[0-9]+]]:_(s32) = COPY $vgpr0
    ; GCN-NEXT: %x:_(s16) = G_TRUNC [[COPY]](s32)
    ; GCN-NEXT: %sqrt:_(s16) = G_FSQRT %x
    ; GCN-NEXT: %one:_(s16) = G_FCONSTANT half 0xH3C00
    ; GCN-NEXT: %rsq:_(s16) = contract G_FDIV %one, %sqrt
    ; GCN-NEXT: %ext:_(s32) = G_ANYEXT %rsq(s16)
    ; GCN-NEXT: $vgpr0 = COPY %ext(s32)
    ; GCN-NEXT: S_ENDPGM 0, implicit %sqrt(s16)
    %0:_(s32) = COPY $vgpr0
    %x:_(s16) = G_TRUNC %0:_(s32)
    %sqrt:_(s16) = G_FSQRT %x
    %one:_(s16) = G_FCONSTANT half 1.0
    %rsq:_(s16) = contract G_FDIV %one, %sqrt
    %ext:_(s32) = G_ANYEXT %rsq:_(s16)
    $vgpr0 = COPY %ext
    S_ENDPGM 0, implicit %sqrt

...

---
name:            rsq_f16_multi_use_missing_contract1
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $vgpr0

    ; GCN-LABEL: name: rsq_f16_multi_use_missing_contract1
    ; GCN: liveins: $vgpr0
    ; GCN-NEXT: {{  $}}
    ; GCN-NEXT: [[COPY:%[0-9]+]]:_(s32) = COPY $vgpr0
    ; GCN-NEXT: %x:_(s16) = G_TRUNC [[COPY]](s32)
    ; GCN-NEXT: %sqrt:_(s16) = contract G_FSQRT %x
    ; GCN-NEXT: %one:_(s16) = G_FCONSTANT half 0xH3C00
    ; GCN-NEXT: %rsq:_(s16) = G_FDIV %one, %sqrt
    ; GCN-NEXT: %ext:_(s32) = G_ANYEXT %rsq(s16)
    ; GCN-NEXT: $vgpr0 = COPY %ext(s32)
    ; GCN-NEXT: S_ENDPGM 0, implicit %sqrt(s16)
    %0:_(s32) = COPY $vgpr0
    %x:_(s16) = G_TRUNC %0:_(s32)
    %sqrt:_(s16) = contract G_FSQRT %x
    %one:_(s16) = G_FCONSTANT half 1.0
    %rsq:_(s16) = G_FDIV %one, %sqrt
    %ext:_(s32) = G_ANYEXT %rsq:_(s16)
    $vgpr0 = COPY %ext
    S_ENDPGM 0, implicit %sqrt

...

---
name:            rsq_f32
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $vgpr0

    ; GCN-LABEL: name: rsq_f32
    ; GCN: liveins: $vgpr0
    ; GCN-NEXT: {{  $}}
    ; GCN-NEXT: %x:_(s32) = COPY $vgpr0
    ; GCN-NEXT: %sqrt:_(s32) = contract G_FSQRT %x
    ; GCN-NEXT: %one:_(s32) = G_FCONSTANT float 1.000000e+00
    ; GCN-NEXT: %rsq:_(s32) = contract G_FDIV %one, %sqrt
    ; GCN-NEXT: $vgpr0 = COPY %rsq(s32)
    %x:_(s32) = COPY $vgpr0
    %sqrt:_(s32) = contract G_FSQRT %x
    %one:_(s32) = G_FCONSTANT float 1.0
    %rsq:_(s32) = contract G_FDIV %one, %sqrt
    $vgpr0 = COPY %rsq

...

---
name:            neg_rsq_f32
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $vgpr0

    ; GCN-LABEL: name: neg_rsq_f32
    ; GCN: liveins: $vgpr0
    ; GCN-NEXT: {{  $}}
    ; GCN-NEXT: %x:_(s32) = COPY $vgpr0
    ; GCN-NEXT: %sqrt:_(s32) = contract G_FSQRT %x
    ; GCN-NEXT: %neg_one:_(s32) = G_FCONSTANT float -1.000000e+00
    ; GCN-NEXT: %rsq:_(s32) = contract G_FDIV %neg_one, %sqrt
    ; GCN-NEXT: $vgpr0 = COPY %rsq(s32)
    %x:_(s32) = COPY $vgpr0
    %sqrt:_(s32) = contract G_FSQRT %x
    %neg_one:_(s32) = G_FCONSTANT float -1.0
    %rsq:_(s32) = contract G_FDIV %neg_one, %sqrt
    $vgpr0 = COPY %rsq

...

---
name:            afn_rsq_f32
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $vgpr0

    ; GCN-LABEL: name: afn_rsq_f32
    ; GCN: liveins: $vgpr0
    ; GCN-NEXT: {{  $}}
    ; GCN-NEXT: %x:_(s32) = COPY $vgpr0
    ; GCN-NEXT: %sqrt:_(s32) = contract afn G_FSQRT %x
    ; GCN-NEXT: %one:_(s32) = G_FCONSTANT float 1.000000e+00
    ; GCN-NEXT: %rsq:_(s32) = contract afn G_FDIV %one, %sqrt
    ; GCN-NEXT: $vgpr0 = COPY %rsq(s32)
    %x:_(s32) = COPY $vgpr0
    %sqrt:_(s32) = contract afn G_FSQRT %x
    %one:_(s32) = G_FCONSTANT float 1.0
    %rsq:_(s32) = contract afn G_FDIV %one, %sqrt
    $vgpr0 = COPY %rsq

...

---
name:            afn_rsq_f32_multi_use
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $vgpr0

    ; GCN-LABEL: name: afn_rsq_f32_multi_use
    ; GCN: liveins: $vgpr0
    ; GCN-NEXT: {{  $}}
    ; GCN-NEXT: %x:_(s32) = COPY $vgpr0
    ; GCN-NEXT: %sqrt:_(s32) = contract afn G_FSQRT %x
    ; GCN-NEXT: %one:_(s32) = G_FCONSTANT float 1.000000e+00
    ; GCN-NEXT: %rsq:_(s32) = contract afn G_FDIV %one, %sqrt
    ; GCN-NEXT: %ret:_(s32) = G_FSUB %sqrt, %rsq
    ; GCN-NEXT: $vgpr0 = COPY %ret(s32)
    %x:_(s32) = COPY $vgpr0
    %sqrt:_(s32) = contract afn G_FSQRT %x
    %one:_(s32) = G_FCONSTANT float 1.0
    %rsq:_(s32) = contract afn G_FDIV %one, %sqrt
    %ret:_(s32) = G_FSUB %sqrt, %rsq
    $vgpr0 = COPY %ret

...

---
name:            afn_neg_rsq_f32
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $vgpr0

    ; GCN-LABEL: name: afn_neg_rsq_f32
    ; GCN: liveins: $vgpr0
    ; GCN-NEXT: {{  $}}
    ; GCN-NEXT: %x:_(s32) = COPY $vgpr0
    ; GCN-NEXT: %sqrt:_(s32) = contract afn G_FSQRT %x
    ; GCN-NEXT: %neg_one:_(s32) = G_FCONSTANT float -1.000000e+00
    ; GCN-NEXT: %rsq:_(s32) = contract afn G_FDIV %neg_one, %sqrt
    ; GCN-NEXT: $vgpr0 = COPY %rsq(s32)
    %x:_(s32) = COPY $vgpr0
    %sqrt:_(s32) = contract afn G_FSQRT %x
    %neg_one:_(s32) = G_FCONSTANT float -1.0
    %rsq:_(s32) = contract afn G_FDIV %neg_one, %sqrt
    $vgpr0 = COPY %rsq

...


---
name:            rsq_f64
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $vgpr0

    ; GCN-LABEL: name: rsq_f64
    ; GCN: liveins: $vgpr0
    ; GCN-NEXT: {{  $}}
    ; GCN-NEXT: [[COPY:%[0-9]+]]:_(s32) = COPY $vgpr0
    ; GCN-NEXT: %x:_(s64) = G_ANYEXT [[COPY]](s32)
    ; GCN-NEXT: %sqrt:_(s64) = contract G_FSQRT %x
    ; GCN-NEXT: %one:_(s64) = G_FCONSTANT double 1.000000e+00
    ; GCN-NEXT: %rsq:_(s64) = contract G_FDIV %one, %sqrt
    ; GCN-NEXT: %ext:_(s32) = G_TRUNC %rsq(s64)
    ; GCN-NEXT: $vgpr0 = COPY %ext(s32)
    %0:_(s32) = COPY $vgpr0
    %x:_(s64) = G_ANYEXT %0:_(s32)
    %sqrt:_(s64) = contract G_FSQRT %x
    %one:_(s64) = G_FCONSTANT double 1.0
    %rsq:_(s64) = contract G_FDIV %one, %sqrt
    %ext:_(s32) = G_TRUNC %rsq:_(s64)
    $vgpr0 = COPY %ext

...

---
name:            neg_rsq_f64
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $vgpr0

    ; GCN-LABEL: name: neg_rsq_f64
    ; GCN: liveins: $vgpr0
    ; GCN-NEXT: {{  $}}
    ; GCN-NEXT: [[COPY:%[0-9]+]]:_(s32) = COPY $vgpr0
    ; GCN-NEXT: %x:_(s64) = G_ANYEXT [[COPY]](s32)
    ; GCN-NEXT: %sqrt:_(s64) = contract G_FSQRT %x
    ; GCN-NEXT: %neg_one:_(s64) = G_FCONSTANT double -1.000000e+00
    ; GCN-NEXT: %rsq:_(s64) = contract G_FDIV %neg_one, %sqrt
    ; GCN-NEXT: %ext:_(s32) = G_TRUNC %rsq(s64)
    ; GCN-NEXT: $vgpr0 = COPY %ext(s32)
    %0:_(s32) = COPY $vgpr0
    %x:_(s64) = G_ANYEXT %0:_(s32)
    %sqrt:_(s64) = contract G_FSQRT %x
    %neg_one:_(s64) = G_FCONSTANT double -1.0
    %rsq:_(s64) = contract G_FDIV %neg_one, %sqrt
    %ext:_(s32) = G_TRUNC %rsq:_(s64)
    $vgpr0 = COPY %ext

...

---
name:            afn_rsq_f64
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $vgpr0

    ; GCN-LABEL: name: afn_rsq_f64
    ; GCN: liveins: $vgpr0
    ; GCN-NEXT: {{  $}}
    ; GCN-NEXT: [[COPY:%[0-9]+]]:_(s32) = COPY $vgpr0
    ; GCN-NEXT: %x:_(s64) = G_ANYEXT [[COPY]](s32)
    ; GCN-NEXT: %sqrt:_(s64) = contract afn G_FSQRT %x
    ; GCN-NEXT: %one:_(s64) = G_FCONSTANT double 1.000000e+00
    ; GCN-NEXT: %rsq:_(s64) = contract afn G_FDIV %one, %sqrt
    ; GCN-NEXT: %ext:_(s32) = G_TRUNC %rsq(s64)
    ; GCN-NEXT: $vgpr0 = COPY %ext(s32)
    %0:_(s32) = COPY $vgpr0
    %x:_(s64) = G_ANYEXT %0:_(s32)
    %sqrt:_(s64) = contract afn G_FSQRT %x
    %one:_(s64) = G_FCONSTANT double 1.0
    %rsq:_(s64) = contract afn G_FDIV %one, %sqrt
    %ext:_(s32) = G_TRUNC %rsq:_(s64)
    $vgpr0 = COPY %ext

...

---
name:            afn_neg_rsq_f64
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $vgpr0

    ; GCN-LABEL: name: afn_neg_rsq_f64
    ; GCN: liveins: $vgpr0
    ; GCN-NEXT: {{  $}}
    ; GCN-NEXT: [[COPY:%[0-9]+]]:_(s32) = COPY $vgpr0
    ; GCN-NEXT: %x:_(s64) = G_ANYEXT [[COPY]](s32)
    ; GCN-NEXT: %sqrt:_(s64) = contract afn G_FSQRT %x
    ; GCN-NEXT: %neg_one:_(s64) = G_FCONSTANT double -1.000000e+00
    ; GCN-NEXT: %rsq:_(s64) = contract afn G_FDIV %neg_one, %sqrt
    ; GCN-NEXT: %ext:_(s32) = G_TRUNC %rsq(s64)
    ; GCN-NEXT: $vgpr0 = COPY %ext(s32)
    %0:_(s32) = COPY $vgpr0
    %x:_(s64) = G_ANYEXT %0:_(s32)
    %sqrt:_(s64) = contract afn G_FSQRT %x
    %neg_one:_(s64) = G_FCONSTANT double -1.0
    %rsq:_(s64) = contract afn G_FDIV %neg_one, %sqrt
    %ext:_(s32) = G_TRUNC %rsq:_(s64)
    $vgpr0 = COPY %ext

...


---
name:            rsq_fract_num_f16
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $vgpr0

    ; GCN-LABEL: name: rsq_fract_num_f16
    ; GCN: liveins: $vgpr0
    ; GCN-NEXT: {{  $}}
    ; GCN-NEXT: [[COPY:%[0-9]+]]:_(s32) = COPY $vgpr0
    ; GCN-NEXT: %x:_(s16) = G_TRUNC [[COPY]](s32)
    ; GCN-NEXT: %fract:_(s16) = G_FCONSTANT half 0xH3800
    ; GCN-NEXT: [[INT:%[0-9]+]]:_(s16) = contract G_INTRINSIC intrinsic(@llvm.amdgcn.rsq), %x(s16)
    ; GCN-NEXT: %rsq:_(s16) = contract G_FMUL [[INT]], %fract
    ; GCN-NEXT: %ext:_(s32) = G_ANYEXT %rsq(s16)
    ; GCN-NEXT: $vgpr0 = COPY %ext(s32)
    %0:_(s32) = COPY $vgpr0
    %x:_(s16) = G_TRUNC %0:_(s32)
    %sqrt:_(s16) = contract G_FSQRT %x
    %fract:_(s16) = G_FCONSTANT half 0.5
    %rsq:_(s16) = contract G_FDIV %fract, %sqrt
    %ext:_(s32) = G_ANYEXT %rsq:_(s16)
    $vgpr0 = COPY %ext

...

---
name:            neg_rsq_fract_num_f16
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $vgpr0

    ; GCN-LABEL: name: neg_rsq_fract_num_f16
    ; GCN: liveins: $vgpr0
    ; GCN-NEXT: {{  $}}
    ; GCN-NEXT: [[COPY:%[0-9]+]]:_(s32) = COPY $vgpr0
    ; GCN-NEXT: %x:_(s16) = G_TRUNC [[COPY]](s32)
    ; GCN-NEXT: %neg_fract:_(s16) = G_FCONSTANT half 0xHB800
    ; GCN-NEXT: [[INT:%[0-9]+]]:_(s16) = contract G_INTRINSIC intrinsic(@llvm.amdgcn.rsq), %x(s16)
    ; GCN-NEXT: %rsq:_(s16) = contract G_FMUL [[INT]], %neg_fract
    ; GCN-NEXT: %ext:_(s32) = G_ANYEXT %rsq(s16)
    ; GCN-NEXT: $vgpr0 = COPY %ext(s32)
    %0:_(s32) = COPY $vgpr0
    %x:_(s16) = G_TRUNC %0:_(s32)
    %sqrt:_(s16) = contract G_FSQRT %x
    %neg_fract:_(s16) = G_FCONSTANT half -0.5
    %rsq:_(s16) = contract G_FDIV %neg_fract, %sqrt
    %ext:_(s32) = G_ANYEXT %rsq:_(s16)
    $vgpr0 = COPY %ext


...

---
name:            rsq_large_num_f16
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $vgpr0

    ; GCN-LABEL: name: rsq_large_num_f16
    ; GCN: liveins: $vgpr0
    ; GCN-NEXT: {{  $}}
    ; GCN-NEXT: [[COPY:%[0-9]+]]:_(s32) = COPY $vgpr0
    ; GCN-NEXT: %x:_(s16) = G_TRUNC [[COPY]](s32)
    ; GCN-NEXT: %ten:_(s16) = G_FCONSTANT half 0xH4900
    ; GCN-NEXT: [[INT:%[0-9]+]]:_(s16) = contract G_INTRINSIC intrinsic(@llvm.amdgcn.rsq), %x(s16)
    ; GCN-NEXT: %rsq:_(s16) = contract G_FMUL [[INT]], %ten
    ; GCN-NEXT: %ext:_(s32) = G_ANYEXT %rsq(s16)
    ; GCN-NEXT: $vgpr0 = COPY %ext(s32)
    %0:_(s32) = COPY $vgpr0
    %x:_(s16) = G_TRUNC %0:_(s32)
    %sqrt:_(s16) = contract G_FSQRT %x
    %ten:_(s16) = G_FCONSTANT half 10.0
    %rsq:_(s16) = contract G_FDIV %ten, %sqrt
    %ext:_(s32) = G_ANYEXT %rsq:_(s16)
    $vgpr0 = COPY %ext

...

---
name:            neg_rsq_large_num_f16
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $vgpr0

    ; GCN-LABEL: name: neg_rsq_large_num_f16
    ; GCN: liveins: $vgpr0
    ; GCN-NEXT: {{  $}}
    ; GCN-NEXT: [[COPY:%[0-9]+]]:_(s32) = COPY $vgpr0
    ; GCN-NEXT: %x:_(s16) = G_TRUNC [[COPY]](s32)
    ; GCN-NEXT: %neg_ten:_(s16) = G_FCONSTANT half 0xHC900
    ; GCN-NEXT: [[INT:%[0-9]+]]:_(s16) = contract G_INTRINSIC intrinsic(@llvm.amdgcn.rsq), %x(s16)
    ; GCN-NEXT: %rsq:_(s16) = contract G_FMUL [[INT]], %neg_ten
    ; GCN-NEXT: %ext:_(s32) = G_ANYEXT %rsq(s16)
    ; GCN-NEXT: $vgpr0 = COPY %ext(s32)
    %0:_(s32) = COPY $vgpr0
    %x:_(s16) = G_TRUNC %0:_(s32)
    %sqrt:_(s16) = contract G_FSQRT %x
    %neg_ten:_(s16) = G_FCONSTANT half -10.0
    %rsq:_(s16) = contract G_FDIV %neg_ten, %sqrt
    %ext:_(s32) = G_ANYEXT %rsq:_(s16)
    $vgpr0 = COPY %ext

...
llvm/llvm/test/CodeGen/AMDGPU/GlobalISel/combine-fdiv-sqrt-to-rsq.mir
