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1eab5ae9ea
Remove an unnecessary round-trip:
iterator => operator->() => getIterator()
In some cases, the iterator is end(), so the dereference of operator->
is invalid (UB).
The testcase only crashes with r278974 (currently reverted to
investigate this), which adds an assertion for invalid dereferences of
ilist nodes.
Fixes PR29035.
llvm-svn: 279104
30 lines
804 B
LLVM
30 lines
804 B
LLVM
; RUN: llc < %s | FileCheck %s
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; Make sure we don't crash in AArch64RedundantCopyElimination when a
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; MachineBasicBlock is empty. PR29035.
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target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
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target triple = "aarch64-unknown-linux-gnu"
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declare i8* @bar()
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; CHECK-LABEL: foo:
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; CHECK: tbz
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; CHECK: orr
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; CHECK: ret
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; CHECK: bl bar
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; CHECK: cbnz
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; CHECK: ret
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define i1 @foo(i1 %start) {
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entry:
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br i1 %start, label %cleanup, label %if.end
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if.end: ; preds = %if.end, %entry
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%call = tail call i8* @bar()
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%cmp = icmp eq i8* %call, null
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br i1 %cmp, label %cleanup, label %if.end
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cleanup: ; preds = %if.end, %entry
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%retval.0 = phi i1 [ true, %entry ], [ false, %if.end ]
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ret i1 %retval.0
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}
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