[llvm-dev] [PATCH] Add optional _Float16 support

[Joseph Myers via llvm-dev]

On Thu, 1 Jul 2021, H.J. Lu via Gcc-patches wrote:

> 2. Return _Float16 and _Complex _Float16 values in %xmm0/%xmm1 registers.

That restricts use of _Float16 to processors with SSE.  Is that what we 
want in the ABI, or should _Float16 be available with base 32-bit x86 
architecture features only, much like _Float128 and the decimal FP types 
are?  (If it is restricted to SSE, we can of course ensure relevant libgcc 
functions are built with SSE enabled, and likewise in glibc if that gains 
_Float16 functions, though maybe with some extra complications to get 
relevant testcases to run whenever possible.)

-- 
Joseph S. Myers
joseph at codesourcery.com