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121
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1 ; RUN: opt < %s -inline -instcombine -S | FileCheck %s
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2
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3 ; This test case exposed a bug in instcombine where the early
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4 ; DCE of a call wasn't recognized as changing the IR.
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5 ; So when runOnFunction propagated the "made changes" upwards
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6 ; to the CallGraphSCCPass it signalled that no changes had been
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7 ; made, so CallGraphSCCPass assumed that the old CallGraph,
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8 ; as known by that pass manager, still was up-to-date.
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9 ;
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10 ; This was detected as an assert when trying to remove the
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11 ; no longer used function 'bar' (due to incorrect reference
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12 ; count in the CallGraph).
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13
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14 attributes #0 = { noinline norecurse nounwind readnone }
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15
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16 define void @foo() #0 {
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17 ; CHECK-LABEL: @foo(
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18 ; CHECK-NEXT: entry:
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19 ; CHECK-NEXT: ret void
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20 ;
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21 entry:
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22 %call = call i32 @bar()
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23 ret void
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24 }
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25
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26 define internal i32 @bar() #0 {
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27 ; CHECK-NOT: bar
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28 entry:
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29 ret i32 42
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30 }
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31
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