[go-nuts] instruction gen in amd64, it iseems not the best choice?

[xie cui]

function:
func test3(a int) int {
  return a * 3 + 4
}

go version go1.13.5 darwin/amd64
generate instructions:
  LEAQ    (AX)(AX*2), AX
  LEAQ    4(AX), AX

As far as i known，there a better choice
 LEAQ    4(AX*3), AX

Can it be optimized?

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