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Re:“Risc V greatly underperforms” by mlyle on Friday December 03, 2021 @01:25AM (#29427209)
For this specific case, yes, the RISC-V ISA document recommends instruction sequences for checking for overflow-- that are both amenable to fusion and are relatively high performing on implementations that don't fuse.

Section 2.4, https://riscv.org/wp-content/uploads/2017/05/riscv-spec-v2.2...

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