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void bork() { int *address = 0; *address = 0; } It's compiled into LLVM code that looks like this: define void @bork() noreturn nounwind { entry: unreachable } This is bad on some platforms (like PPC) because it will generate the label for the function but no body. The label could end up being associated with some non-code related stuff, like a section. This places a "trap" instruction if the SimplifyCFG pass removed all code from the function leaving only one "unreachable" instruction. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46387 91177308-0d34-0410-b5e6-96231b3b80d8 |
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