11.66 --largeregions, --no_largeregions
Controls the sorting order of sections in large execution regions to minimize the distance between sections that call each other.
If the execution region contains more code than the range of a branch instruction then the linker switches to large region mode. In this mode the linker sorts according to the approximated average call depth of each section in ascending order. The linker might also place distribute veneers amongst the code sections to minimize the number of veneers.
NoteLarge region mode can result in large changes to the layout of an image even when small changes are made to the input.
To disable large region mode and revert to lexical order, use
--no_largeregions. Section placement is then predictable and
image comparisons are more predictable. The linker automatically switches on
--veneerinject if it is needed for a branch to reach the veneer.
Large region support enables:
Average call depth sorting,
The following command lines are equivalent:
armlink --largeregions --no_api --no_veneerinject --sort=Lexical armlink --no_largeregions
The default is
--no_largeregions. The linker automatically switches to
--largeregions if at least one execution region contains more code than
the smallest inter-section branch. The smallest inter-section branch depends on the code in
the region and the target processor:
Execution region contains only A64 instructions.
Execution region contains only A32 instructions.
Execution region contains T32 instructions, 32-bit T32 instructions are supported.
Execution region contains T32 instructions, no 32-bit T32 instructions are supported.