It is likely a code for GOARCH=amd64. Back in the distant past, there were separate Go compilers for different CPU architectures. The one for amd64 was 6g, for 386 it was 8g, etc.

It looks like the x86 directory is code that was originally written for amd64, and then generalized to cover 386 as well.

Andy

On 3/29/21 7:45 AM, xie cui wrote:
https://github.com/golang/go/blob/master/src/cmd/internal/obj/x86/asm6.go
this file named asm6, and there is a func named span6, what is 6 for here?
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