Re: Question about strange register calling truncates to SImode on x86_64

[Kai Tietz]

Hello Michael,

thanks for description. I wasn't aware, that the upper 32 bits are zeroed. 
Does this means that even the stack has to be in the first 4 Gb, too. Or 
does this mov instruction does a sign-extention. 

Best regards,
 i.A. Kai Tietz