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Here’s a data point: Coremark fits in the FE310’s 16 KB icache with C and runs really great. Without C it doesn’t fit and runs twice slower.
Here is another set of data points. PicoRV32 on a LUT4 architecture without HW multiply: C adds +24% area, M adds + 21% area. (Both add +45% area. They share zero resources, as on would expect.) Or, since you already have M in the mix: rv32imc is +17% compared to rv32im.
Pretty cheap. It wouldn’t take a very big program to get that back in code size savings.
picorv32 supports the C extension and vexriscv has wip support for the C extension. Are there any other popular foss riscv softcores with a large userbase that don't support the C extension? Ideally at some point we'll also support rv32i and rv32im for educational cores.
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