fminnm/fmaxnm generation in aarch64

[Joseph Myers]

On Mon, 7 May 2018, Indu Bhagat wrote:

> Q2. If one wants the compiler to generate fminnm/fmaxnm instructions, while
>     conforming with IEEE standard, the way to do that will be to use math
>     builtins fmin()/fmax(). Is this correct understanding?

For IEEE 754-2008 minNum / maxNum operations, which those instructions 
correspond to and fmin and fmax bind to, yes.  For IEEE 754-2018 (in 
progress), there are different minimum / maximum operations, which don't 
match those AArch64 instructions (but some do match RISC-V instructions), 
and there are new proposed corresponding C functions such as fmaximum and 
fminimum_num (I don't know of implementations of those functions).

-- 
Joseph S. Myers
joseph@codesourcery.com