Why need to load %%l0 register during switch_to macro

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HI, all
 
I have another question about switch_to macro.
 
Why need to load %%l0 register during switch_to macro?
 
"ldd [%%sp+0x00], %%l0" 
 
I think load %%i6 is enough.
 
Hoping this time my mail style is correct.
 
Thanks All

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Best regards

Bob Liu
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