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

# RUN: llc -run-pass postrapseudos -mtriple=x86_64-unknown-unknown -mattr=+3dnow -o /dev/null %s 2>&1 | 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, _, -8, _, killed %xmm0
    %mm0 = PSWAPDrm %rsp, 1, _, -8, _
  ; CHECK:      %rax = MMX_MOVD64from64rr %mm0
  ; CHECK-NEXT: %mm0 = MMX_MOVD64to64rr %rax
    %rax = COPY %mm0
    %mm0 = COPY %rax
    MMX_MOVQ64mr %rsp, 1, _, -16, _, killed %mm0
    %xmm0 = MOVQI2PQIrm %rsp, 1, _, -16, _
    %xmm0 = PSHUFDri killed %xmm0, -44
    RETQ %xmm0
...