[LLVMdev] Is infinite empty loop dead code?

[Duncan Sands]

Hi Shuxin,

>      Is it legal to delete empty infinite loop like this : "while(1) {}"?
> It is interesting that both llvm and gcc keep the loop, however Open64 delete it.

this is an endless source of discussion.  I suggest you read the GCC and LLVM
mailing list archives if you want to find out more about it.

Ciao, Duncan.

>     If it is safe to delete this loop, it would be lot easier to delete non-obvious
> dead loop like following as compiler doesn't need to prove if the loop in question
> is infinite or not. Currently llvm is not able to delete such dead loop.
>
>     while (a) { a = whatever } ; // no use of <a> after this point.
>
> Thanks
>
> Shuxin
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