derek.holloway
7502bf64a4
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69 lines
2.0 KiB
YAML
69 lines
2.0 KiB
YAML
# RUN: llc %s -mtriple=s390x-linux-gnu -mcpu=z13 \
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# RUN: -start-before=register-coalescer -o - 2>&1 > /dev/null
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# Test that the SystemZ shouldCoalesce() implementation does not crash in
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# case of an undef use in another MBB. This was discovered in testing with
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# -systemz-subreg-liveness.
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--- |
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@g_74 = external dso_local unnamed_addr global i32, align 4
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@g_193 = external dso_local unnamed_addr global i32, align 4
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define dso_local void @main() local_unnamed_addr {
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%1 = load i32, ptr @g_193
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%2 = or i32 %1, -1395153718
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%3 = sdiv i32 -1395153718, %2
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br i1 undef, label %5, label %4
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; <label>:4: ; preds = %0
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store i32 %3, ptr @g_74
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store i32 -9, ptr @g_74
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ret void
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; <label>:5: ; preds = %0
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unreachable
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}
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...
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---
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name: main
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alignment: 16
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tracksRegLiveness: true
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registers:
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- { id: 0, class: grx32bit }
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- { id: 1, class: addr64bit }
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- { id: 2, class: gr32bit }
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- { id: 3, class: gr32bit }
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- { id: 4, class: gr64bit }
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- { id: 5, class: gr128bit }
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- { id: 6, class: gr128bit }
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- { id: 7, class: grx32bit }
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- { id: 8, class: gr32bit }
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- { id: 9, class: gr128bit }
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body: |
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bb.0 (%ir-block.0):
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successors: %bb.2(0x00000001), %bb.1(0x7fffffff)
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%1:addr64bit = LARL @g_193
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%2:gr32bit = IIFMux 2899813578
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%3:gr32bit = COPY killed %2
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%3:gr32bit = O %3, killed %1, 0, $noreg, implicit-def dead $cc :: (dereferenceable load (s32) from @g_193)
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%4:gr64bit = LGFI -1395153718
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undef %5.subreg_l64:gr128bit = COPY killed %4
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%6:gr128bit = COPY killed %5
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dead %6:gr128bit = DSGFR %6, killed %3
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%7:grx32bit = LHIMux 0
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CHIMux killed %7, 0, implicit-def $cc
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BRC 14, 6, %bb.2, implicit killed $cc
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J %bb.1
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bb.1 (%ir-block.4):
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%8:gr32bit = LHIMux -9
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STRL killed %8, @g_74 :: (store (s32) into @g_74)
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Return
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bb.2 (%ir-block.5):
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dead %0:grx32bit = COPY undef %6.subreg_l32
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...
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