| # RUN: llc -run-pass simple-register-coalescing -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 |