test/behavior/bugs/421.zig


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const builtin = @import("builtin");
const expect = @import("std").testing.expect;

test "bitCast to array" {
    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
    if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
    if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
    if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;

    try comptime testBitCastArray();
    try testBitCastArray();
}

fn testBitCastArray() !void {
    try expect(extractOne64(0x0123456789abcdef0123456789abcdef) == 0x0123456789abcdef);
}

fn extractOne64(a: u128) u64 {
    const x = @as([2]u64, @bitCast(a));
    return x[1];
}