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  • Purpose of memory alignment - Stack Overflow
    The memory system of a processor is quite a bit more complex and involved than described here; a discussion on how an x86 processor actually addresses memory can help (many processors work similarly) There are many more benefits to adhering to memory alignment that you can read at this IBM article A computer's primary use is to transform data
  • How important is memory alignment? Does it still matter?
    Yes, memory alignment still matters Some processors actually can't perform reads on non-aligned addresses If you're running on such hardware, and you store your integers non-aligned, you're likely to have to read them with two instructions followed by some more instructions to get the various bytes into the right places so you can actually use it
  • malloc - What is aligned memory allocation? - Stack Overflow
    Similarly, if you want to allocate a memory buffer for data that is to be paged (similar to addresses returned by mmap(), etc ) then you need a possibly very large alignment which would waste a lot of memory if malloc() was to return buffers always aligned to such boundaries
  • Memory alignment : how to use alignof alignas? - Stack Overflow
    Data alignment means putting the data in memory at address equal to some multiple of the word size Explanation 2 Alignment is a property of a memory address, expressed as the numeric address modulo a power of 2 For example, the address 0x0001103F modulo 4 is 3 That address is said to be aligned to 4n+3, where 4 indicates the chosen power of 2
  • cpu - Memory Alignment - Software Engineering Stack Exchange
    A memory address a is said to be n-byte aligned when a is a multiple of n (where n is a power of 2) In this context, a byte is the smallest unit of memory access, i e each memory address specifies a different byte It's probably a very simple and obvious thing, yet these things can be hard to convey sometimes
  • Memory Alignment in C C++ - Stack Overflow
    There was a topic regarding Memory alignment In the code below the author says that first struct is really slow because it is both not bit-aligned nor byte-aligned The second one is not bit-aligned but byte-aligned The last one is fast because it's both He says without pragma, compiler will align the memory itself which causes waste of memory
  • c - What is meant by memory is 8 bytes aligned? - Stack Overflow
    The memory alignment is important for performance in different ways It has a hardware related reason Since the 80s there is a difference in access time between the CPU and the memory The speed of the processor is growing faster than the speed of the memory
  • c++ - how does malloc understand alignment? - Stack Overflow
    Alignment Any memory Alignment Any memory that's allocated dynamically via new or malloc is guaranteed to be properly aligned for objects of any type, but buffers that are not allocated dynamically have no such guarantee It doesn't have to know what type you have in mind, because it's aligning for any type On any given system, there's a
  • Why is the alignment the same on 32-bit and 64-bit systems?
    The minimum absolute alignment of 4 comes from the 4-byte stack alignment that 32-bit code can assume In static storage, compilers will choose natural alignment up to maybe 8 or 16 bytes for vars outside of structs, for efficient copying with SSE2 vectors
  • memory alignment - How is the size of a C++ class determined? - Stack . . .
    For elementary types (int, double, et cetera), the alignment requirements are implementation-defined and are usually largely determined by the hardware On many processors, it is faster to load and store data when it has a certain alignment (usually when its address in memory is a multiple of its size)





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