1 # RUN: llc -run-pass register-coalescer -O0 -mtriple x86_64-pc-linux-gnu -o - %s | FileCheck %s
5 tracksRegLiveness: true
8 undef %18.sub_8bit_hi:gr16_abcd = COPY undef $al
9 %1:gr16_abcd = COPY killed %18
10 dead %8:gr8 = COPY undef %1.sub_8bit_hi
14 # This used to hit an assertion:
15 # lib/CodeGen/RegisterCoalescer.cpp:1110: RegisterCoalescer::reMaterializeTrivialDef(...): Assertion `ValNo && "CopyMI input register not live"' failed.
17 # CHECK-LABEL: name: foo
19 # CHECK-NEXT: $al = COPY undef %2:gr8