>macro op fusion turns out to be viable Macro-op fusion predates RISC-V. What's new is that RISC-V has been designed with knowledge of Macro-op fusion, which

>macro op fusion turns out to be viable Macro-op fusion predates RISC-V. What's new is that RISC-V has been designed with knowledge of Macro-op fusion, which gave it some opportunities. I'd say it weights very little overall; RISC-V is very clever, irrespective of fusion.