Data Model usually expressed using integer, long and pointer (ILP) size. For example, ILP32 means the integer, long and point are all of size 32-bits. LP62 means that long and pointer are 64-bit and integer are 32-bits (not specified). LLP means integer and long are 32-bits but long long and pointer are 64-bits. Note that char and short are 8 and 16-bits in all models.
Most compilers uses ILP32 for 32-bit code LP64 for 64-bit code. Most major UNIX distributions including Mac OS X use LP64 model except Windows uses LLP64. C program runs well on 32-bit system (ILP32) may not work in LP64.
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