Why can't C compilers rearrange struct members to eliminate alignment padding? [duplicate]

Why can't C compilers rearrange struct members to eliminate alignment padding? [duplicate]

c struct compiler-optimization memory-alignment

c

Why does GCC pad functions with NOPs?

c assembly gcc memory-alignment

c

Are stack variables aligned by the GCC attribute((aligned(x)))?

c gcc memory-alignment callstack

c

What does it mean to align the stack?

c assembly gcc x86 memory-alignment

c

how does malloc understand alignment?

c++ c memory-alignment

c

Memory alignment in C-structs

c++ c memory memory-alignment structure-packing

c

What exactly is an 'aligned pointer'?

c++ c memory-alignment

c

Why are the addresses of argc and argv 12 bytes apart?

c memory-alignment

c

What is meant by "memory is 8 bytes aligned"?

c memory-management memory-alignment

c

When extending a padded struct, why can't extra fields be placed in the tail padding?

c++ c struct memory-alignment

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Take advantage of ARM unaligned memory access while writing clean C code

c arm memory-alignment

c

Why is the size of this struct 24?

c++ c struct sizeof memory-alignment

c

Compiler Warning when using Pointers to Packed Structure Members

c++ c pointers struct memory-alignment

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Is it guaranteed that the type T[x][y] has the same memory layout as T[x*y] in C?

c multidimensional-array language-lawyer memory-alignment

c