llvm/llvm/test/CodeGen/X86/twoaddr-dbg-value.mir

# RUN: llc -run-pass=livevars,twoaddressinstruction -mtriple=x86_64-- -o - %s | FileCheck %s
---
name:            foo
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $edi

    %0:gr32 = COPY killed $edi
    %1:gr32 = COPY killed %0
    %4:gr32 = XOR32ri %1, 1, implicit-def dead $eflags
    DBG_VALUE %4
    %5:gr32 = COPY %4
    PUSH32r killed %1, implicit-def $esp, implicit $esp
    $eax = COPY killed %5
    RET64 implicit killed $eax

...

# Verify that the DBG_VALUE instruction does not inhibit
# TwoAddressInstructionPass::rescheduleMIBelowKill optimization

# CHECK: PUSH32r %1, implicit-def $esp, implicit $esp
# CHECK-NEXT: %2:gr32 = COPY killed %1
# CHECK-NEXT: %2:gr32 = XOR32ri %2, 1, implicit-def dead $eflags
# CHECK-NEXT: DBG_VALUE %2
# CHECK-NEXT: %3:gr32 = COPY killed %2