check if address is 16 byte aligned

For instance, if the address of a data is 12FEECh (1244908 in decimal), then it is 4-byte alignment because the address can be evenly divisible by 4. In short an unaligned address is one of a simple type (e.g., integer or floating point variable) that is bigger than (usually) a byte and not evenly divisible by the size of the data type one tries to read. If they arent, the address isnt 16 byte aligned and we need to pre-heat our SIMD loop. Why is address zero used for the null pointer? Seems to me that the most obvious way to do this would be to use Boost's implementation of aligned_storage (or TR1's, if you have that). (NOTE: This case is hypothetical). On a 32 bit architecture that doesn't 8-align either, How Intuit democratizes AI development across teams through reusability. Why is the stack 16 byte aligned? - ITQAGuru.com This is consistent with what wikipedia suggested. While going through one project, I have seen that the memory data is "8 bytes aligned". However, if you are developing a library you can't. Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? Dynanically allocated data with malloc() is supposed to be "suitably aligned for any built-in type" and hence is always at least 64 bits aligned. Tags C C++ memory programming. To check if an address is 64 bits aligned, you just have to check if its 3 least significant bits are null. @Benoit: If you need to align a struct on 16, just add 12 bytes of padding at the end @VladLazarenko, Works, but not nice and portable. This operation masks the higher bits of the memory address, except the last 4, like so. What Is the Difference Between 'Man' And 'Son of Man' in Num 23:19? What does 4-byte aligned mean? A multiple of 8. But in an array of float, each element is 4 bytes, so the second is 4-byte aligned. To my knowledge a common SSE-optimized function would look like this: However, how do I correctly determine if the memory ptr points to is aligned by e.g. How to determine if address is word aligned - Stack Overflow . - jww Aug 24, 2018 at 14:10 Add a comment 8 Answers Sorted by: 58 How Intuit democratizes AI development across teams through reusability. We simply mask the upper portion of the address, and check if the lower 4 bits are zero. Does a barbarian benefit from the fast movement ability while wearing medium armor? so I can amend my answer? The cryptic if statement now becomes very clear and intuitive. What video game is Charlie playing in Poker Face S01E07? Yes, I can. Not the answer you're looking for? I will definitely test it. CPUs with cache fetch memory in whole (aligned) cache-line chunks so the external bus only matters for uncached MMIO accesses. 64- . . c - How to determine if memory is aligned? - Stack Overflow A 64 bit address has 8 bytes.

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