Re: [Qemu-devel] [PATCH] tests/tcg: add float_madds test to multiarch

[Richard Henderson]

On 9/13/19 9:49 AM, Alex Bennée wrote:
> +                    /* must be built with -O2 to generate fused op */
> +                    r = a * b + c;

I would prefer to use fmaf() or __builtin_fmaf() here.

Although you'll need to link with -lm just in case the
target doesn't support an instruction for fmaf and so
the builtin expands to the standard library call.

I also like Paul's suggestion to use hex float constants.


r~