On 01/30/2013 03:55 PM, Andrew Haley wrote: >> > >> > It's incorrect to rely on the extension taking place. It's not incorrect >> > to >> > do the extension. > Sure, I understand that, but I am completely baffled as to how > extending at a call site avoids partial register stalls if a callee > cannot assume that a value is already extended.
Ah, sorry. Thinking about it some more, if the register is extended at the call site, the partial register stall will be avoided whether or not the callee extends. So, we're correct to extend at the call site, and correct to extend in the callee. LLVM isn't correct not to extend at the callee. Thanks, Andrew.
