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# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 5
# RUN: llc -mtriple=s390x-linux-gnu -mcpu=z13 -start-before=livevars -stop-after=register-coalescer %s -o - | FileCheck %s
# Test that coalesing of an empty live range (undef) does not cause failure.
---
name: fun
tracksRegLiveness: true
body: |
; CHECK-LABEL: name: fun
; CHECK: bb.0:
; CHECK-NEXT: successors: %bb.2(0x40000000), %bb.1(0x40000000)
; CHECK-NEXT: liveins: $r2d, $r3d
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: [[COPY:%[0-9]+]]:addr64bit = COPY $r3d
; CHECK-NEXT: [[COPY1:%[0-9]+]]:addr64bit = COPY $r2d
; CHECK-NEXT: [[LHIMux:%[0-9]+]]:grx32bit = LHIMux 1
; CHECK-NEXT: [[LHIMux1:%[0-9]+]]:grx32bit = LHIMux 0
; CHECK-NEXT: CHIMux [[LHIMux1]], 0, implicit-def $cc
; CHECK-NEXT: BRC 14, 6, %bb.2, implicit killed $cc
; CHECK-NEXT: J %bb.1
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: bb.1:
; CHECK-NEXT: successors: %bb.2(0x80000000)
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: [[LMux:%[0-9]+]]:gr32bit = LMux [[COPY1]], 0, $noreg :: (load (s32))
; CHECK-NEXT: undef [[LLILL:%[0-9]+]].subreg_h64:gr128bit = LLILL 0
; CHECK-NEXT: [[LLILL:%[0-9]+]]:gr128bit = DLR [[LLILL]], [[LMux]]
; CHECK-NEXT: [[LHIMux:%[0-9]+]]:grx32bit = COPY [[LLILL]].subreg_ll32
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: bb.2:
; CHECK-NEXT: STMux [[LHIMux]], [[COPY]], 0, $noreg :: (store (s32))
; CHECK-NEXT: Return
bb.0:
liveins: $r2d, $r3d
%5:addr64bit = COPY $r3d
%4:addr64bit = COPY $r2d
%6:grx32bit = LHIMux 1
%7:grx32bit = LHIMux 0
CHIMux killed %7, 0, implicit-def $cc
BRC 14, 6, %bb.2, implicit $cc
J %bb.1
bb.1:
%1:gr32bit = LMux %4, 0, $noreg :: (load (s32))
%15:gr64bit = LLILL 0
%14:gr128bit = INSERT_SUBREG undef %13:gr128bit, %15, %subreg.subreg_h64
%11:gr128bit = INSERT_SUBREG %14, undef %9:gr64bit, %subreg.subreg_l64
%12:gr128bit = DLR %11, %1
%2:grx32bit = COPY %12.subreg_ll32
bb.2:
%3:grx32bit = PHI %6, %bb.0, %2, %bb.1
STMux %3, %5, 0, $noreg :: (store (s32))
Return
...
## NOTE: These prefixes are unused and the list is autogenerated. Do not add tests below this line:
# CHECK: {{.*}}
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