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    Upvotes102Top Answeredited Mar 29, 2011 at 13:30

    When structures are defined, the compiler is allowed to add paddings (spaces without actual data) so that members fall in address boundaries that are easier to access for the CPU.

    For example, on a 32-bit CPU, 32-bit members should start at addresses that are multiple of 4 bytes in order to be efficiently accessed (read and written). The following s...

    struct S {
    int16_t member1;
    int32_t member2;
    };

    The structure in memory of the above structure in a 32-bit architecture is (~ = padding):

    +---------+---------+
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    What is that packing thing?packed normally just means that you have 4 floats in one 16-byte vector, like addps xmm0, xmm1. "unpacked" isn't a normal way to describe a SIMD data format; can you give a specific context where you saw this used?
    What is a packed struct?In short, packed structs are for dealing efficiently with packed data, and packed data may be what your program is given to work with. For the most part, you code should read values out of the structure, work with them, and write them back when done. All else should be done outside the packed structure.
    What does packed' mean in GCC?Quoting the gcc documentation: The `packed' attribute specifies that a variable or structure field should have the smallest possible alignment--one byte for a variable, and one bit for a field, unless you specify a larger value with the `aligned' attribute.
    When a structure is packed?When you use a structure somewhere, it (its members) will be packed if and only if the structure itself was declared packed. This is kind of implied by the fact that the size of a structure is completely determined by its declaration. UPDATE: For some reason you're still confused about arrays.
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