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# RUN: llc -run-pass register-coalescer -O0 -mtriple x86_64-pc-linux-gnu -o - %s | FileCheck %s
# RUN: llc -passes register-coalescer -O0 -mtriple x86_64-pc-linux-gnu -o - %s | FileCheck %s
---
name: foo
tracksRegLiveness: true
body: |
bb.0:
undef %18.sub_8bit_hi:gr16_abcd = COPY undef $al
%1:gr16_abcd = COPY killed %18
dead %8:gr8 = COPY undef %1.sub_8bit_hi
$al = COPY undef %8
...
# This used to hit an assertion:
# lib/CodeGen/RegisterCoalescer.cpp:1110: RegisterCoalescer::reMaterializeTrivialDef(...): Assertion `ValNo && "CopyMI input register not live"' failed.
#
# CHECK-LABEL: name: foo
# CHECK: bb.0:
# CHECK-NEXT: $al = COPY undef %2:gr8
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