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About ordering execution regions containing Thumb code

The Thumb branch range is 4MB. When an execution region contains Thumb code that exceeds 4MB, armlink attempts to order sections that are at a similar average call depth and to place the most commonly called sections centrally. This helps to minimize the number of veneers generated.

The Thumb-2 branch range is 16MB. Section re-ordering is only required if that limit is exceeded.

To disable section re-ordering, use the --no_largeregions command-line option.

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