[LLVMdev] Improving Garbage Collection
sebastian.redl at getdesigned.at
Thu Jul 7 01:50:47 PDT 2011
On 07.07.2011 08:31, Nate Fries wrote:
> On 7/6/2011 6:24 PM, Talin wrote:
>> The LLVM code generators and analysis passes have a much more
>> thorough knowledge of SSA value lifetimes than frontends do, and
>> therefore could avoid spilling and reloading of values when it wasn't
> Although this would indeed be nice, it is not done by similar
> platforms in practice. I have investigated [very] briefly into whether
> the CLR or JVM implement garbage collection in their IR, and it does
> not seem that they do (meaning, the CLR/JVM implementation itself is
> responsible for garbage collection, not the code generated by the
> CLR/Java language compilers).
I'm not sure this is a valid comparison. CLR and JVM IRs are typed, and
by nature of those VMs, *all* pointers on the stack and in registers are
automatically GC roots. Unlike LLVM, the JVM (and I think the CLR)
doesn't even have a concept of a non-GC pointer.
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