About

The Zfa extension provides several new instructions to improve the performance of floating point code for RISC-V. Of particular importance is the fli instruction for loading predefined constants into FP registers, but there are also fround instructions and additional comparisons/min/max instructions. The fli instructions will typically replace a load from the constant pool, so they're faster, smaller and reduce the data footprint of FP code as well.

This work appears to be complete for LLVM.

Dependencies

Status

Development	COMPLETE
Development Timeline	2H2023
Upstreaming	COMPLETE
Upstream Version	LLVM 17	Fall 2023
Contacts	Jeff Law (Ventana)
Dependencies

Updates

15 Jun 2023

Upstream LLVM has integrated Zfa support

01 Jun 2023

Project reported as priority for 2H23

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