File: no-regclass.mir

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llvm-toolchain-17 1%3A17.0.6-22
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# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
# RUN: llc -O0 -mtriple=aarch64-apple-ios -global-isel -start-before=legalizer -stop-after=instruction-select %s -o - | FileCheck %s

# We run the legalizer to combine the trivial EXTRACT_SEQ pair, leaving %1 and
# %2 orphaned after instruction-selection (no instructions define or use
# them). This shouldn't be a problem.

--- |
  target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"

  define void @unused_reg() { ret void }

---
name:            unused_reg
legalized:       true
regBankSelected: true
tracksRegLiveness: true


body:             |
  bb.0:
    liveins: $w0
    ; CHECK-LABEL: name: unused_reg
    ; CHECK: liveins: $w0
    ; CHECK: [[COPY:%[0-9]+]]:gpr32all = COPY $w0
    ; CHECK: $w0 = COPY [[COPY]]
    %0:gpr(s32) = COPY $w0
    %1:gpr(s64) = G_MERGE_VALUES %0(s32), %0(s32)
    %2:gpr(s32), %3:gpr(s32) = G_UNMERGE_VALUES %1(s64)
    $w0 = COPY %2(s32)
...