third_party/llvm-project/llvm/test/CodeGen/X86/expand-vr64-gr64-copy.mir

# RUN: llc -run-pass postrapseudos -mtriple=x86_64-unknown-unknown -mattr=+3dnow -o - %s | FileCheck %s
# This test verifies that the ExpandPostRA pass expands the GR64 <-> VR64
# copies into appropriate MMX_MOV instructions.

--- |

  define <2 x i32> @test_pswapdsi(<2 x i32> %a) nounwind readnone {
  entry:
    %0 = bitcast <2 x i32> %a to x86_mmx
    %1 = tail call x86_mmx @llvm.x86.3dnowa.pswapd(x86_mmx %0)
    %2 = bitcast x86_mmx %1 to <2 x i32>
    ret <2 x i32> %2
  }

  declare x86_mmx @llvm.x86.3dnowa.pswapd(x86_mmx) nounwind readnone

...
---
name:            test_pswapdsi
tracksRegLiveness: true
body: |
  bb.0.entry:
    liveins: $xmm0

    $xmm0 = PSHUFDri killed $xmm0, -24
    MOVPQI2QImr $rsp, 1, $noreg, -8, $noreg, killed $xmm0
    $mm0 = PSWAPDrm $rsp, 1, $noreg, -8, $noreg
  ; CHECK:      $rax = MMX_MOVD64from64rr $mm0
  ; CHECK-NEXT: $mm0 = MMX_MOVD64to64rr $rax
    $rax = COPY $mm0
    $mm0 = COPY $rax
    MMX_MOVQ64mr $rsp, 1, $noreg, -16, $noreg, killed $mm0
    $xmm0 = MOVQI2PQIrm $rsp, 1, $noreg, -16, $noreg
    $xmm0 = PSHUFDri killed $xmm0, -44
    RETQ $xmm0
...