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1# RUN: llc %s -mtriple=s390x-linux-gnu -mcpu=z13 \2# RUN: -start-before=register-coalescer -o - 2>&1 > /dev/null3 4# Test that the SystemZ shouldCoalesce() implementation does not crash in5# case of an undef use in another MBB. This was discovered in testing with6# -systemz-subreg-liveness.7 8--- |9 @g_74 = external dso_local unnamed_addr global i32, align 410 @g_193 = external dso_local unnamed_addr global i32, align 411 12 define dso_local void @main() local_unnamed_addr {13 %1 = load i32, ptr @g_19314 %2 = or i32 %1, -139515371815 %3 = sdiv i32 -1395153718, %216 br i1 undef, label %5, label %417 18 ; <label>:4: ; preds = %019 store i32 %3, ptr @g_7420 store i32 -9, ptr @g_7421 ret void22 23 ; <label>:5: ; preds = %024 unreachable25 }26 27...28---29name: main30alignment: 1631tracksRegLiveness: true32registers: 33 - { id: 0, class: grx32bit }34 - { id: 1, class: addr64bit }35 - { id: 2, class: gr32bit }36 - { id: 3, class: gr32bit }37 - { id: 4, class: gr64bit }38 - { id: 5, class: gr128bit }39 - { id: 6, class: gr128bit }40 - { id: 7, class: grx32bit }41 - { id: 8, class: gr32bit }42 - { id: 9, class: gr128bit }43body: |44 bb.0 (%ir-block.0):45 successors: %bb.2(0x00000001), %bb.1(0x7fffffff)46 47 %1:addr64bit = LARL @g_19348 %2:gr32bit = IIFMux 289981357849 %3:gr32bit = COPY killed %250 %3:gr32bit = O %3, killed %1, 0, $noreg, implicit-def dead $cc :: (dereferenceable load (s32) from @g_193)51 %4:gr64bit = LGFI -139515371852 undef %5.subreg_l64:gr128bit = COPY killed %453 %6:gr128bit = COPY killed %554 dead %6:gr128bit = DSGFR %6, killed %355 %7:grx32bit = LHIMux 056 CHIMux killed %7, 0, implicit-def $cc57 BRC 14, 6, %bb.2, implicit killed $cc58 J %bb.159 60 bb.1 (%ir-block.4):61 %8:gr32bit = LHIMux -962 STRL killed %8, @g_74 :: (store (s32) into @g_74)63 Return64 65 bb.2 (%ir-block.5):66 dead %0:grx32bit = COPY undef %6.subreg_l3267 68...69