On Friday, 10 January 2020 at 00:08:44 UTC, Johan wrote:
On Friday, 10 January 2020 at 00:02:52 UTC, Johan wrote:
[...]
You have to tell LDC that you are compiling for a CPU that has
FMA capability (otherwise it will insert a call to a "fma"
runtime library function that most likely you are not linking
with). For example, "-mattr=fma" or "-mcpu=skylake".
https://d.godbolt.org/z/ddwORl
Or you add it only for the "fma" function, using
```
import ldc.attributes;
@target("fma") double fma(double a, double b, double c) ...
```
https://d.godbolt.org/z/-X7FnC
https://wiki.dlang.org/LDC-specific_language_changes#.40.28ldc.attributes.target.28.22feature.22.29.29
cheers,
Johan
I need it for the rounding behavior. Thanks for the pointers,
that's very helpful.
