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      1 # RUN: llc -march=mips64 -o - %s -run-pass=simple-register-coalescing | FileCheck %s
      2 
      3 ---
      4 name:            f
      5 tracksRegLiveness: true
      6 body:             |
      7  bb.0:
      8     successors: %bb.1
      9 
     10     %21:gpr32 = ADDiu $zero, 0
     11     %22:gpr32 = COPY %21
     12     %22:gpr32 = ADDiu %22, 1
     13     J %bb.1, implicit-def dead $at
     14 
     15  bb.1:
     16     successors: %bb.2
     17 
     18     BEQ %22, $zero, %bb.2, implicit-def $at
     19 
     20  bb.2:
     21     successors: %bb.2, %bb.3
     22 
     23     %22:gpr32 = COPY %21
     24     %21:gpr32 = COPY %22
     25     BEQ undef %0:gpr32, $zero, %bb.2, implicit-def $at
     26 
     27  bb.3:
     28 
     29 ...
     30 
     31 # We should not hoist the
     32 #
     33 #  %22:gpr32 = COPY %21
     34 #
     35 # into bb.1 since %22 is used in the BEQ.
     36 
     37 # CHECK-LABEL: bb.1:
     38 # CHECK-NOT:      COPY
     39 # CHECK:          BEQ
     40 
     41 # CHECK-LABEL: bb.2:
     42