On Tuesday, 18 June 2019 at 12:26:14 UTC, lili wrote:
Hi guys:
   Is the Dlang fix-length array alloc on stack?  when a test
    writeln([1]).sizeof //16
    writeln([2]).sizeof //16
    Why, What is the fix-length array memory layout.

I'm assuming you mean writeln([1].sizeof).
An array literal is a slice of a dynamic array (which is length + pointer, so 2*size_t size). A fixed size array has to be declared as a local / member variable, and then the content is on the stack:

int[10] a;
writeln(a.sizeof); // 40
writeln(a[].sizeof); // 16 on 64-bit or 8 on 32-bit

To get a static array literal, you can use the library function staticArray:
import std.array;
writeln([1, 2, 3].staticArray.sizeof); // 12

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