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1 # NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
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2 # RUN: llc -march=amdgcn -mcpu=gfx803 -run-pass simple-register-coalescing -verify-machineinstrs -o - %s | FileCheck %s
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3 #
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4 # This is another example of a test giving "Couldn't join subrange!"
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5 #
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6 # This shows a case where a whole reg use point of the whole register was
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7 # undefined in one subreg, but after coalescing it became defined but the
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8 # subrange was not updated to reflect that.
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9 #
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10
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11 ---
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12 name: coalescing_makes_lane_defined
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13 tracksRegLiveness: true
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14 body: |
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15 ; CHECK-LABEL: name: coalescing_makes_lane_defined
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16 ; CHECK: bb.0:
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17 ; CHECK: successors: %bb.1(0x40000000), %bb.2(0x40000000)
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18 ; CHECK: undef %4.sub2:sgpr_128 = S_MOV_B32 0
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19 ; CHECK: dead undef %7.sub0:sgpr_128 = S_MOV_B32 0
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20 ; CHECK: S_CBRANCH_SCC0 %bb.2, implicit undef $scc
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21 ; CHECK: bb.1:
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22 ; CHECK: successors: %bb.2(0x80000000)
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23 ; CHECK: %4.sub0:sgpr_128 = S_MOV_B32 -1
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24 ; CHECK: bb.2:
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25 ; CHECK: S_NOP 0, implicit %4
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26 bb.0:
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27 successors: %bb.1, %bb.2
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28
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29 %0:sreg_32_xm0 = S_MOV_B32 0
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30 undef %1.sub2:sgpr_128 = COPY %0
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31 undef %2.sub0:sgpr_128 = S_MOV_B32 0
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32 undef %3.sub2:sgpr_128 = COPY %0
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33 S_CBRANCH_SCC0 %bb.2, implicit undef $scc
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34
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35 bb.1:
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36 successors: %bb.2
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37
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38 undef %4.sub0:sgpr_128 = S_MOV_B32 -1
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39 %4.sub2:sgpr_128 = COPY killed %0
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40 %5:sgpr_128 = COPY killed %4
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41 %6:sgpr_128 = COPY killed %1
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42 %3:sgpr_128 = COPY killed %6
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43 %2:sgpr_128 = COPY killed %5
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44
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45 bb.2:
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46 S_NOP 0, implicit killed %3
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47
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48 ...
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