RISC-V and Floating Point
RISC-V has introduced support for floating-point arithmetic through various extensions to its base ISA. The F extension allows for single precision floating-point operations, while the D extension adds support for double precision. Additional extensions for half precision and quadruple precision have also been specified, although the latter has seen limited adoption.
- ▪RISC-V's base ISA does not include floating-point instructions, requiring extensions for such support.
- ▪The F extension introduces a dedicated register file for floating-point operations, enhancing flexibility and simplifying register allocation.
- ▪RISC-V's floating-point support aligns with the widely accepted IEEE-754 standard, ensuring compatibility with existing floating-point arithmetic practices.
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RISC-V and Floating-PointBecause Floating-Point RocksFPRoxMay 16, 202671ShareRISC-V support for floating-point arithmetic is a topic we have partially covered in a few previous posts but we felt like it deserves a full overview post of its own.RISC-V base ISA (RV32I or RV64I) does not define any floating-point instructions. RISC-V provides extensions to the base ISA to bring such support for floating-point arithmetic.The map of ratified floating-point ISA extensions (and their dependencies) is presented in the figures below. The first figure presents both scalar and vector ratified floating-point extensions.
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