Re: [PATCH] RISC-V: Add autovec FP widening/narrowing.

[Jeff Law via Gcc-patches]

On 6/26/23 12:58, Robin Dapp wrote:
Hi,

this patch adds FP widening and narrowing autovec expanders as well as
tests.  Conceptually similar to integer extension/truncation, we emulate
_Float16 -> double by two vfwcvts and double -> _Float16 by two vfncvts.

Optimizations to create widening operations will be added separately.

Regards
  Robin

gcc/ChangeLog:

        * config/riscv/autovec.md (extend<v_double_trunc><mode>2): New
        expander.
        (extend<v_quad_trunc><mode>2): Dito.
        (trunc<mode><v_double_trunc>2): Dito.
        (trunc<mode><v_quad_trunc>2): Dito.
        * config/riscv/vector-iterators.md: Add VQEXTF and HF to
        V_QUAD_TRUNC and v_quad_trunc.
It looks like you fixed the type of trunc<mode><vdouble_trunc>2 to be a 
narrowing vector shift from just a vector shift.  This isn't reflected 
in the ChangeLog.

I wasn't aware that "Dito" was an accepted spelling.  I had to look it 
up ;-)

OK with the ChangeLog fixed.

jeff