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# RUN: llc -o - -mtriple=x86_64-- -run-pass=regallocfast %s | FileCheck %s
# Fast regalloc used to not collect physical register definitions
# before walking and assigning the virtual definition.
# Therefore it was possible for a virtual definition to end up
# using the same register as a later (in terms of operand list) physical
# register.
# Check this does not happen.
#
# PR41790
---
name: instruction_with_1virtreg_1physreg_defs
tracksRegLiveness: true
body: |
bb.0:
; CHECK-NOT: $rax = KILL implicit-def dead $rax
%0:gr64 = KILL implicit-def dead $rax
KILL killed %0
RET 0
...
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