Intel x86

MIPS

#pragma pack(n)  

Sets the alignment modulus to n, where n may be 1, 2, 4, 8 or 16. For MIPS compilers, if n is 0, structure alignment is reset to the default setting.

#pragma pack(push, n)  

Pushes the current alignment modulus on a stack, then sets it to n, where n may be 1, 2, 4, 8 or 16. Use push and pop when you need a specific modulus for some declaration or set of declarations, but do not want to disturb the default setting. This form is not supported by the MIPS compilers.

#pragma pack(pop)  

Pops a previously pushed alignment modulus from the stack. This form is not supported by the MIPS compilers.

#pragma pack()  

For x86 compilers, resets alignment modulus to the value specified in the x86 CodeGen settings panel. For MIPS compilers, resets structure alignment to the default setting.