gen_i2c_adapter problem on x86_64

[Christian Thalinger]

John Rose wrote:
> On Sep 8, 2009, at 1:36 AM, Christian Thalinger wrote:
> 
>> At least when we have a C2I-I2C call path.
> 
> OK, that's the new part.  In order to do some of the argument  
> shuffling, adapter method handles can go through a C2I-I2C transition  
> pair.
> 
> This is why we need the extra support for preserving SP in compiled  
> calls to method handles, and why MH.invoke calls must (on x86/32)  
> stash the outgoing SP in BP.  We need a similar convention on x86/64.

I already store SP in BP for MH.invoke calls in x86_64, otherwise it
wouldn't work at all.  But I don't see the connection between these two.
 Can you explain?

-- Christian