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Since GNAT uses the `gcc' back end, all the specialized `gcc' optimization switches are potentially usable. These switches have not been extensively tested with GNAT but can generally be expected to work. Examples of switches in this category are `-funroll-loops' and the various target-specific `-m' options (in particular, it has been observed that `-march=xxx' can significantly improve performance on appropriate machines). For full details of these switches, see the Submodel Options section in the Hardware Models and Configurations chapter of Using the GNU Compiler Collection (GCC).