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

[Jeff Law <jeffreyalaw@gmail.com>]

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