# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 6
# RUN: llc -mtriple=x86_64-unknown-linux-gnu -run-pass=register-coalescer -verify-coalescing -o - %s | FileCheck %s

# Regression test for https://github.com/llvm/llvm-project/issues/195587.
# Register coalescer crashed coalescing a COPY from an erasable IMPLICIT_DEF
# when a tied-def redef immediately followed: the pruned segment endpoint was
# incorrectly added to EndPoints, causing extendToIndices to walk the CFG for
# a reaching def that does not exist.

---
name: coalesce_copy_from_erasable_implicit_def
tracksRegLiveness: true
constants:
  - id:    0
    value: 'i32 0'
    alignment: 16
body:             |
  bb.0:
    ; CHECK-LABEL: name: coalesce_copy_from_erasable_implicit_def
    ; CHECK: [[SHUFPSrmi:%[0-9]+]]:vr128 = SHUFPSrmi undef [[SHUFPSrmi]], $rip, 1, $noreg, %const.0, $noreg, 16 :: (load (s128) from constant-pool)
    ; CHECK-NEXT: [[SHUFPSrmi:%[0-9]+]]:vr128 = SHUFPSrri [[SHUFPSrmi]], [[SHUFPSrmi]], -24
    ; CHECK-NEXT: RET 0, implicit [[SHUFPSrmi]]
    %0:vr128 = IMPLICIT_DEF
    %1:vr128 = COPY %0
    %1:vr128 = SHUFPSrmi %1, $rip, 1, $noreg, %const.0, $noreg, 16 :: (load (s128) from constant-pool)
    %2:vr128 = COPY killed %1
    %2:vr128 = SHUFPSrri %2, killed %0, -24
    RET 0, implicit killed %2
...