poor codegen for abs(), and div by literal?

[NaN]

On Saturday, 9 February 2019 at 03:28:41 UTC, Basile B. wrote:
> On Thursday, 7 February 2019 at 23:15:08 UTC, NaN wrote:
>> Given the following code...

> LDC2 does almost that, excepted that the logical AND is in a 
> sub program:
>
>   push rax
>   movss dword ptr [rsp+04h], xmm1
>   call 000000000045A020h
>   movss dword ptr [rsp], xmm0
>   movss xmm0, dword ptr [rsp+04h]
>   call 000000000045A020h
>   mulss xmm0, dword ptr [rsp]
>   mulss xmm0, dword ptr [<address of constant>]
>   pop rax
>   ret

What flags are you passing LDC? I cant get it to convert the 
division into a multiply by it's inverse unless i specifically 
change /3.142f to /(1.0f/3.142f).

and FWIW im using...

float fabs(float x) // need cause math.fabs not being inlined
{
     uint tmp = *(cast(int*)&x) & 0x7fffffff;
     float f = *(cast(float*) &tmp);
     return f;
}

that compiles down to a single "andps" instruction and is inlined 
if it's in the same module. I tried cross module inlining as 
suggested in the LDC forum but it caused my program to hang.