fabs not being inlined?

[kinke]

On Saturday, 9 February 2019 at 15:08:22 UTC, NaN wrote:
> On Friday, 8 February 2019 at 14:47:20 UTC, Guillaume Piolat 
> wrote:
>> Alternative: inline by hand
>>
>> https://godbolt.org/z/DS0XIb
>
> This might not be pretty but it coaxes LDC to do abs with a 
> single instruction...
>
> https://godbolt.org/z/0aVvSR

Both manual versions are ugly and IMO should be avoided at all 
costs. ;) If LTO/cross-module-inlining is not an option but fabs 
performance is critical, then use the intrinsic directly:

import ldc.intrinsics;
alias fabs = llvm_fabs;

The reason std.math doesn't just alias (I had a go at this once) 
is that there are some tests checking that the std.math functions 
are real functions (and that their address can be taken).

> lld-link.exe: error: undefined symbol: __chkstk

Looks like some linker tricks required for the MinGW-based libs 
don't work with LTO; I guess it works with the MS toolchain, 
e.g., when run inside in a Visual Studio command prompt. I'll 
spare you the dirty details.