[Issue 20041] New: CTFE incorrect result with __vector

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20041

          Issue ID: 20041
           Summary: CTFE incorrect result with __vector
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: major
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: thomas.bockman at gmail.com

import std.stdio;

struct Vec3Fast {
    __vector(float[4]) raw;

    this(const(float[3]) value...) inout pure @safe nothrow @nogc {
        __vector(float[4]) raw;
        raw[0 .. 3] = value[];
        raw[3] = 0.0f;
        this.raw = raw;
    }
}

void main() {
    static immutable Vec3Fast v = Vec3Fast(  1.0f, 2.0f, 3.0f );

    static foreach(d; 0 .. 4)
        write(v.raw[d], " ");
}

With CTFE, the above prints "nan nan nan nan ", which is wrong. If I remove the
`static immutable`, it prints "1 2 3 0" as it should.

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