Zca Extension Versions 1.0.0 State ratified Ratification date 2023-04 Synopsis The Zca extension is added as way to refer to instructions in the C extension that do not include the floating-point loads and stores. Therefore it excludes all 16-bit floating point loads and stores: c.flw, c.flwsp, c.fsw, c.fswsp, c.fld, c.fldsp, c.fsd, c.fsdsp. The 'C' extension only includes F/D instructions when D and F are also specified.