A long time ago getg was written in assembly in the runtime package. These 
days it is implemented directly as pseudo instruction in the compiler. 
Search for OpGetG in $GOROOT/src/cmd/compile/internal

On Wednesday, 17 January 2018 12:40:48 UTC+11, Jiajun Huang wrote:
>
> Hi, all:
>
>      I'm reading golang runtime implementation, I've got a function 
> definition:
>
> // getg returns the pointer to the current g.
> // The compiler rewrites calls to this function into instructions
> // that fetch the g directly (from TLS or from the dedicated register).
> func getg() *g
>
>
>     So, is there any solution that I can reading what implementation does 
> the compiler rewrite? It seems that it's Assembly code.
>

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