[LLVMdev] Can simplifycfg kill llvm.lifetime intrinsics?
kparzysz at codeaurora.org
Fri Dec 28 07:23:22 PST 2012
On 12/28/2012 1:51 AM, Alexey Samsonov wrote:
> On Fri, Dec 28, 2012 at 12:35 AM, Rafael Espíndola
> <rafael.espindola at gmail.com <mailto:rafael.espindola at gmail.com>> wrote:
> What about calling
> llvm.lifetime.start in one function and llvm.lifetime.end in another?
> I don't see how this can happen, assuming that arguments of llvm.lifetime
> can only come from allocas.
It could happen after a cold section of a function was outlined, for
example. Informational intrinsics should not prohibit optimizations,
and barring provably wrong cases, we need to assume that an optimization
(possibly a future one) can transform code in a way that is not
predictable up front.
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