llvm/test/CodeGen/ARM/GlobalISel/arm-legalize-exts.mir

# RUN: llc -mtriple arm-- -run-pass=legalizer %s -o - | FileCheck %s
# RUN: llc -mtriple thumb-- -mattr=+v6t2 -run-pass=legalizer %s -o - | FileCheck %s
--- |
  define void @test_zext_s16_to_s32() { ret void }
  define void @test_sext_s8_to_s32() { ret void }
  define void @test_sext_inreg_s8_to_s32() { ret void }
  define void @test_anyext_s1_to_s32() { ret void }

  define void @test_zext_s8_to_s16() { ret void }
  define void @test_sext_s1_to_s16() { ret void }

  define void @test_anyext_s1_to_s8() { ret void }

  define void @test_ext_combine() { ret void }
...
---
name:            test_zext_s16_to_s32
# CHECK-LABEL: name: test_zext_s16_to_s32
legalized:       false
# CHECK: legalized: true
regBankSelected: false
selected:        false
tracksRegLiveness: true
registers:
  - { id: 0, class: _ }
  - { id: 1, class: _ }
  - { id: 2, class: _ }
body:             |
  bb.0:
    liveins: $r0

    %0(p0) = COPY $r0
    %1(s16) = G_LOAD %0 :: (load (s16))
    %2(s32) = G_ZEXT %1
    ; G_ZEXT with s16 is legal, so we should find it unchanged in the output
    ; CHECK: {{%[0-9]+}}:_(s32) = G_ZEXT {{%[0-9]+}}
    $r0 = COPY %2(s32)
    BX_RET 14, $noreg, implicit $r0
...
---
name:            test_sext_s8_to_s32
# CHECK-LABEL: name: test_sext_s8_to_s32
legalized:       false
# CHECK: legalized: true
regBankSelected: false
selected:        false
tracksRegLiveness: true
registers:
  - { id: 0, class: _ }
  - { id: 1, class: _ }
  - { id: 2, class: _ }
body:             |
  bb.0:
    liveins: $r0

    %0(p0) = COPY $r0
    %1(s8) = G_LOAD %0(p0) :: (load (s8))
    %2(s32) = G_SEXT %1
    ; G_SEXT with s8 is legal, so we should find it unchanged in the output
    ; CHECK: {{%[0-9]+}}:_(s32) = G_SEXT {{%[0-9]+}}
    $r0 = COPY %2(s32)
    BX_RET 14, $noreg, implicit $r0
...
---
name:            test_sext_inreg_s8_to_s32
# CHECK-LABEL: name: test_sext_inreg_s8_to_s32
legalized:       false
# CHECK: legalized: true
regBankSelected: false
selected:        false
tracksRegLiveness: true
registers:
  - { id: 0, class: _ }
  - { id: 1, class: _ }
  - { id: 2, class: _ }
body:             |
  bb.0:
    liveins: $r0

    %0(p0) = COPY $r0
    %1(s32) = G_LOAD %0(p0) :: (load (s32))
    %2(s32) = G_SEXT_INREG %1, 8
    ; G_SEXT_INREG should be lowered to a shift pair
    ; CHECK: [[T1:%[0-9]+]]:_(s32) = G_CONSTANT i32 24
    ; CHECK: [[T2:%[0-9]+]]:_(s32) = G_SHL {{%[0-9]+}}, [[T1]]
    ; CHECK: {{%[0-9]+}}:_(s32) = G_ASHR [[T2]], [[T1]]
    $r0 = COPY %2(s32)
    BX_RET 14, $noreg, implicit $r0
...
---
name:            test_anyext_s1_to_s32
# CHECK-LABEL: name: test_anyext_s1_to_s32
legalized:       false
# CHECK: legalized: true
regBankSelected: false
selected:        false
tracksRegLiveness: true
registers:
  - { id: 0, class: _ }
  - { id: 1, class: _ }
  - { id: 2, class: _ }
body:             |
  bb.0:
    liveins: $r0

    %0(p0) = COPY $r0
    %1(s1) = G_LOAD %0(p0) :: (load (s1))
    %2(s32) = G_ANYEXT %1
    ; G_ANYEXT with s1 is legal, so we should find it unchanged in the output
    ; CHECK: {{%[0-9]+}}:_(s32) = G_ANYEXT {{%[0-9]+}}
    $r0 = COPY %2(s32)
    BX_RET 14, $noreg, implicit $r0
...
---
name:            test_zext_s8_to_s16
# CHECK-LABEL: name: test_zext_s8_to_s16
legalized:       false
# CHECK: legalized: true
regBankSelected: false
selected:        false
tracksRegLiveness: true
registers:
  - { id: 0, class: _ }
  - { id: 1, class: _ }
  - { id: 2, class: _ }
body:             |
  bb.0:
    liveins: $r0

    %0(p0) = COPY $r0
    %1(s8) = G_LOAD %0(p0) :: (load (s8))
    %2(s16) = G_ZEXT %1
    ; G_ZEXT from s8 to s16 is legal, so we should find it unchanged in the output
    ; CHECK: {{%[0-9]+}}:_(s16) = G_ZEXT {{%[0-9]+}}(s8)
    G_STORE %2(s16), %0(p0) :: (store (s16))
    BX_RET 14, $noreg
...
---
name:            test_sext_s1_to_s16
# CHECK-LABEL: name: test_sext_s1_to_s16
legalized:       false
# CHECK: legalized: true
regBankSelected: false
selected:        false
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $r0, $r1

    %0:_(p0) = COPY $r0
    %1:_(s32) = COPY $r1
    %2:_(s32) = G_CONSTANT i32 0
    %3:_(s1) = G_ICMP intpred(eq), %1, %2
    %4:_(s16) = G_SEXT %3(s1)
    ; G_SEXT from s1 to s16 is legal, so we should find it unchanged in the output
    ; CHECK: {{%[0-9]+}}:_(s16) = G_SEXT {{%[0-9]+}}(s1)
    G_STORE %4(s16), %0(p0) :: (store (s16))
    BX_RET 14, $noreg
...
---
name:            test_anyext_s1_to_s8
# CHECK-LABEL: name: test_anyext_s1_to_s8
legalized:       false
# CHECK: legalized: true
regBankSelected: false
selected:        false
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $r0, $r1

    %0:_(p0) = COPY $r0
    %1:_(s32) = COPY $r1
    %2:_(s32) = G_CONSTANT i32 0
    %3:_(s1) = G_ICMP intpred(eq), %1, %2
    %4:_(s8) = G_ANYEXT %3
    ; G_ANYEXT from s1 to s8 is legal, so we should find it unchanged in the output
    ; CHECK: {{%[0-9]+}}:_(s8) = G_ANYEXT {{%[0-9]+}}(s1)
    G_STORE %4(s8), %0(p0) :: (store (s8))
    BX_RET 14, $noreg
...
---
name:            test_ext_combine
# CHECK-LABEL: name: test_ext_combine
legalized:       false
# CHECK: legalized: true
regBankSelected: false
selected:        false
tracksRegLiveness: true
registers:
  - { id: 0, class: _ }
  - { id: 1, class: _ }
  - { id: 2, class: _ }
  - { id: 3, class: _ }
  - { id: 4, class: _ }
  - { id: 5, class: _ }
body:             |
  bb.0:
    liveins: $r0

    %0(p0) = COPY $r0
    %1(s8) = G_LOAD %0(p0) :: (load (s8))
    ; CHECK: [[V8:%[0-9]+]]:_(s8) = G_LOAD

    %2(s16) = G_ZEXT %1
    %3(s16) = G_SEXT %1

    %4(s16) = G_OR %2, %3
    ; G_OR is going to widen to 32 bits and the extensions/truncs should combine
    ; with the already existing ones
    ; CHECK: [[ZEXT:%[0-9]+]]:_(s32) = G_ZEXT [[V8]](s8)
    ; CHECK: [[SEXT:%[0-9]+]]:_(s32) = G_SEXT [[V8]](s8)
    ; CHECK: [[OR:%[0-9]+]]:_(s32) = G_OR [[ZEXT]], [[SEXT]]
    ; CHECK: [[BITS:%[0-9]+]]:_(s32) = G_CONSTANT i32 16
    ; CHECK: [[SHL:%[0-9]+]]:_(s32) = G_SHL [[OR]], [[BITS]](s32)
    ; CHECK: [[ASHR:%[0-9]+]]:_(s32) = G_ASHR [[SHL]], [[BITS]](s32)
    ; CHECK: $r0 = COPY [[ASHR]]

    %5(s32) = G_SEXT %4(s16)
    $r0 = COPY %5

    BX_RET 14, $noreg, implicit $r0
...