[LLVMdev] ARM support status (GHC/ARM new calling convention)

[Cameron Zwarich]

They work pretty well now, at least on Thumb2 / Darwin. It is still fairly conservative about when to use tail calls, and doesn't support GuaranteedTailCallOpt, which might be necessary for GHC. 

Cameron

On Jun 17, 2011, at 1:31 PM, Karel Gardas wrote:

> 
> John,
> 
> I've moved with patches to HEAD and unfortunately the comments about 
> disabling tailcalls do not go away with this update. Please see 
> ARMTargetLowering::LowerCall in lib/Target/ARM/ARMISelLowering.cpp line 
> 1208 and later. It looks like man can use -arm-tail-calls, but one never 
> knows how good it is since the comment tells it clearly:
> 
> // Temporarily disable tail calls so things don't break.
> 
> so I would like to ask what's the status of tailcalls in LLVM on ARM 
> platform?
> 
> Thanks a lot!
> Karel
> 
> On 06/16/11 11:00 PM, John McCall wrote:
>>> Also in the llvm::ARMTargetLowering::LowerCall I see a comment
>>> about disabling tailcalls just to not break things.
>> 
>> I believe this has been changed on ToT, so since Haskell is
>> presumably completely dependent on tail calls working, you'll need to
>> work there.
> 
> 
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