[LLVMdev] Backend for the ZPU - a stack based / zero operand CPU
sabre at nondot.org
Thu Jun 19 21:57:48 PDT 2008
On Jun 19, 2008, at 2:30 PM, Øyvind Harboe wrote:
> My llvm.org knowledge is ... shallow ... but I'm hoping that
> someone would find the time & pity to answer my questions:
> Q: Is a stack based / zero operand CPU and llvm a good match? (GCC
I'm not really sure, I'm not too familiar with these architectures.
One advantage of llvm is that it is relatively easy to do custom code
generation phases. For example, you probably don't want to run the
register allocator at all.
> Q: Should I expect better code density / performance from llvm than
> GCC for
> said architecture?
Hard to say. In general, LLVM has better high level optimizations
than GCC, so if that is a factor, yes.
> Q: Can llvm help move global data into flash(i.e. determine that
> global C
> variables are in fact constants)?
LLVM does aggressively mark globals as const when there are no stores
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