Memory assignment of local variables
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by Mask
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Published on 2010-03-30T02:47:35Z
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2010/03/30
2:53 UTC
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void function(int a, int b, int c) {
char buffer1[5];
char buffer2[10];
}
We must remember that memory can only be addressed in multiples of the word size. A word in our case is 4 bytes, or 32 bits. So our 5 byte buffer is really going to take 8 bytes (2 words) of memory, and our 10 byte buffer is going to take 12 bytes (3 words) of memory. That is why SP is being subtracted by 20.
Why it's not ceil((5+10)/4)*4=16?
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