test/CodeGen/X86/GlobalISel/select-trunc.mir

# RUN: llc -mtriple=x86_64-linux-gnu -global-isel -run-pass=instruction-select -verify-machineinstrs %s -o - | FileCheck %s --check-prefix=CHECK
--- |
  define i1 @trunc_i32toi1(i32 %a) {
    %r = trunc i32 %a to i1
    ret i1 %r
  }

  define i8 @trunc_i32toi8(i32 %a) {
    %r = trunc i32 %a to i8
    ret i8 %r
  }

  define i16 @trunc_i32toi16(i32 %a) {
    %r = trunc i32 %a to i16
    ret i16 %r
  }

  define i8 @trunc_i64toi8(i64 %a) {
    %r = trunc i64 %a to i8
    ret i8 %r
  }

  define i16 @trunc_i64toi16(i64 %a) {
    %r = trunc i64 %a to i16
    ret i16 %r
  }

  define i32 @trunc_i64toi32(i64 %a) {
    %r = trunc i64 %a to i32
    ret i32 %r
  }

...
---
name:            trunc_i32toi1
# CHECK-LABEL: name:  trunc_i32toi1
alignment:       4
legalized:       true
regBankSelected: true
# CHECK:      registers:
# CHECK-NEXT:   - { id: 0, class: gr32, preferred-register: '' }
# CHECK-NEXT:   - { id: 1, class: gr8, preferred-register: '' }
registers:
  - { id: 0, class: gpr }
  - { id: 1, class: gpr }
# CHECK:          %0 = COPY %edi
# CHECK-NEXT:     %1 = COPY %0.sub_8bit
# CHECK-NEXT:     %al = COPY %1
# CHECK-NEXT:     RET 0, implicit %al
body:             |
  bb.1 (%ir-block.0):
    liveins: %edi

    %0(s32) = COPY %edi
    %1(s1) = G_TRUNC %0(s32)
    %al = COPY %1(s1)
    RET 0, implicit %al

...
---
name:            trunc_i32toi8
# CHECK-LABEL: name:  trunc_i32toi8
alignment:       4
legalized:       true
regBankSelected: true
# CHECK:      registers:
# CHECK-NEXT:   - { id: 0, class: gr32, preferred-register: '' }
# CHECK-NEXT:   - { id: 1, class: gr8, preferred-register: '' }
registers:
  - { id: 0, class: gpr }
  - { id: 1, class: gpr }
# CHECK:          %0 = COPY %edi
# CHECK-NEXT:     %1 = COPY %0.sub_8bit
# CHECK-NEXT:     %al = COPY %1
# CHECK-NEXT:     RET 0, implicit %al
body:             |
  bb.1 (%ir-block.0):
    liveins: %edi

    %0(s32) = COPY %edi
    %1(s8) = G_TRUNC %0(s32)
    %al = COPY %1(s8)
    RET 0, implicit %al

...
---
name:            trunc_i32toi16
# CHECK-LABEL: name:  trunc_i32toi16
alignment:       4
legalized:       true
regBankSelected: true
# CHECK:      registers:
# CHECK-NEXT:   - { id: 0, class: gr32, preferred-register: '' }
# CHECK-NEXT:   - { id: 1, class: gr16, preferred-register: '' }
registers:
  - { id: 0, class: gpr }
  - { id: 1, class: gpr }
# CHECK:          %0 = COPY %edi
# CHECK-NEXT:     %1 = COPY %0.sub_16bit
# CHECK-NEXT:     %ax = COPY %1
# CHECK-NEXT:     RET 0, implicit %ax
body:             |
  bb.1 (%ir-block.0):
    liveins: %edi

    %0(s32) = COPY %edi
    %1(s16) = G_TRUNC %0(s32)
    %ax = COPY %1(s16)
    RET 0, implicit %ax

...
---
name:            trunc_i64toi8
# CHECK-LABEL: name:  trunc_i64toi8
alignment:       4
legalized:       true
regBankSelected: true
# CHECK:      registers:
# CHECK-NEXT:   - { id: 0, class: gr64_with_sub_8bit, preferred-register: '' }
# CHECK-NEXT:   - { id: 1, class: gr8, preferred-register: '' }
registers:
  - { id: 0, class: gpr }
  - { id: 1, class: gpr }
# CHECK:          %0 = COPY %rdi
# CHECK-NEXT:     %1 = COPY %0.sub_8bit
# CHECK-NEXT:     %al = COPY %1
# CHECK-NEXT:     RET 0, implicit %al
body:             |
  bb.1 (%ir-block.0):
    liveins: %rdi

    %0(s64) = COPY %rdi
    %1(s8) = G_TRUNC %0(s64)
    %al = COPY %1(s8)
    RET 0, implicit %al

...
---
name:            trunc_i64toi16
# CHECK-LABEL: name:  trunc_i64toi16
alignment:       4
legalized:       true
regBankSelected: true
# CHECK:      registers:
# CHECK-NEXT:   - { id: 0, class: gr64, preferred-register: '' }
# CHECK-NEXT:   - { id: 1, class: gr16, preferred-register: '' }
registers:
  - { id: 0, class: gpr }
  - { id: 1, class: gpr }
# CHECK:          %0 = COPY %rdi
# CHECK-NEXT:     %1 = COPY %0.sub_16bit
# CHECK-NEXT:     %ax = COPY %1
# CHECK-NEXT:     RET 0, implicit %ax
body:             |
  bb.1 (%ir-block.0):
    liveins: %rdi

    %0(s64) = COPY %rdi
    %1(s16) = G_TRUNC %0(s64)
    %ax = COPY %1(s16)
    RET 0, implicit %ax

...
---
name:            trunc_i64toi32
# CHECK-LABEL: name:  trunc_i64toi32
alignment:       4
legalized:       true
regBankSelected: true
# CHECK:      registers:
# CHECK-NEXT:   - { id: 0, class: gr64, preferred-register: '' }
# CHECK-NEXT:   - { id: 1, class: gr32, preferred-register: '' }
registers:
  - { id: 0, class: gpr }
  - { id: 1, class: gpr }
# CHECK:          %0 = COPY %rdi
# CHECK-NEXT:     %1 = COPY %0.sub_32bit
# CHECK-NEXT:     %eax = COPY %1
# CHECK-NEXT:     RET 0, implicit %eax
body:             |
  bb.1 (%ir-block.0):
    liveins: %rdi

    %0(s64) = COPY %rdi
    %1(s32) = G_TRUNC %0(s64)
    %eax = COPY %1(s32)
    RET 0, implicit %eax

...