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Implement first D-specific optimization pass: -simplify-drtcalls. It uses the machinery of the standard -simplify-libcalls pass, but optimizes calls to the D runtime instead of calls to C libraries. At the moment, these optimizations are implemented by this pass: - Avoid the runtime call for `arr.length = newlen` if it can determine that the new length isn't longer than the old one. - Ditto for `cast(T[]) arr` if it will clearly always succeed. (e.g. if the length of the original array is zero, or if the old element size is a multiple of the new element size)
author Frits van Bommel <fvbommel wxs.nl>
date Tue, 28 Apr 2009 21:58:06 +0200
parents 23538d0f0d5b
children
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module mini.arrays18;

struct Str { int a,b; }
void main() {
    Str[] arr = new Str[64];

    auto tmp = Str(1,2);
    arr[] = tmp;
    assert(arr[0].a == 1);
    assert(arr[0].b == 2);
    assert(arr[13].a == 1);
    assert(arr[13].b == 2);
    assert(arr[42].a == 1);
    assert(arr[42].b == 2);
    assert(arr[63].a == 1);
    assert(arr[63].b == 2);

    arr[] = Str(3,4);
    assert(arr[0].a == 3);
    assert(arr[0].b == 4);
    assert(arr[13].a == 3);
    assert(arr[13].b == 4);
    assert(arr[42].a == 3);
    assert(arr[42].b == 4);
    assert(arr[63].a == 3);
    assert(arr[63].b == 4);
}