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