[bpineau]

The linked post gives an estimation :

> "Tip compiler (with SSA internal checks off) is about 7% slower than go1.6 to compile net/http (go test -a -c -gcflags=-d=ssa/check/off net/http)"

... though we may wonder wether the mesured compiler itself was compiled with or without SSA (with 7% being in the ballpark of the expected SSA gains).

[davecheney]

The compiler always compiles itself as part of the bootstrap process. The final compiler is built with itself and thus uses its own SSA code generation.