6.32.5 IA-64 Variable Attributes

The IA-64 back end supports the following variable attribute:

model (model-name)

On IA-64, use this attribute to set the addressability of an object. At present, the only supported identifier for model-name is small, indicating addressability via “small” (22-bit) addresses (so that their addresses can be loaded with the addl instruction). Caveat: such addressing is by definition not position independent and hence this attribute must not be used for objects defined by shared libraries.

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https://gcc.gnu.org/onlinedocs/gcc-7.4.0/gcc/IA_002d64-Variable-Attributes.html