core.simd woes

[David Nadlinger]

On Monday, 8 October 2012 at 20:23:50 UTC, Iain Buclaw wrote:
> float a = 1, b = 2, c = 3, d = 4;
> float4 f = [a,b,c,d];
>
> ===>
>         movss   -16(%rbp), %xmm0
>         movss   -12(%rbp), %xmm1

The obligatory "me too" post:

LDC turns

---
import core.simd;

struct T {
     float a, b, c, d;
     ubyte[100] passOnStack;
}

void test(T t) {
     receiver([t.a, t.b, t.c, t.d]);
}

void receiver(float4 f);
---

into

---
0000000000000000 <_D4test4testFS4test1TZv>:
    0:   50                      push   rax
    1:   0f 28 44 24 10          movaps xmm0,XMMWORD PTR [rsp+0x10]
    6:   e8 00 00 00 00          call   b 
<_D4test4testFS4test1TZv+0xb>
    b:   58                      pop    rax
    c:   c3                      ret
---

(the struct is just there so that the values are actually on the 
stack, and receiver just so that the optimizer doesn't eat 
everything for breakfast).

David