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Q&A

Posts tagged strict-aliasing

For questions about C's strict aliasing. an assumption made by the C or C++ compiler, that de-referencing pointers to objects of different types will never refer to the same memory location.

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Q&A Storing more bytes than a union member has, but less than the union size, with memcpy(3)

Let's say we have an object, we store it in a union (into some other narrower type, but with memcpy(3), so it's allowed --I guess--), and then read it from the union via it's original type (so no a...

0 answers  ·  posted 7d ago by alx‭  ·  edited 6d ago by alx‭

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Q&A Strict aliasing rules and function boundaries

Let's analyze this code, assuming an architecture where the alignment of int64_t is the same as that of double: void bar(double *f, int64_t *j) { *(int64_t *)f = *j; } void foo(void) ...

1 answer  ·  posted 4mo ago by alx‭  ·  edited 4mo ago by Lundin‭

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Q&A Is `uint8_t` always an alias for a character type if it exists?

Is uint8_t guaranteed to be a character type if it exists? Will using a uint8_t* to examine bytes of an object cause violation of the strict aliasing rule? Is the following legal code: #include &l...

1 answer  ·  posted 2y ago by Ayxan Haqverdili‭  ·  edited 2y ago by Lundin‭