Ways to Improve Performance

Linker Optimizations

subspaces. Merged subspaces can prevent the removal of dead procedures. Therefore, it is optimal to have each procedure in its own subspace.

Complete Executables

For complete executables, dead procedure elimination removes any text subspaces that are not referenced from another subspace. Self references, such as recursive procedures or subspaces with multiple procedures that call each other, are not considered outside references and are therefore candidates for removal.

If the address of a procedure is taken, the subspace within which it resides is not removed. If a subspace is referenced in any way by a fixup representing a reference other than a PC-relative call or an absolute call it is not removed.

Incomplete Executables

For incomplete executables, dead procedure elimination works the same as for complete executables except that no exported symbols or their dependencies are removed. If an incomplete executable contains a symbol that is to be referenced by a shared library and is not exported, it is removed if the other conditions discussed above hold.

Shared Libraries

In shared libraries only symbols that are not referenced and not exported are removed. In shared libraries all symbols that are not of local scope are exported. Therefore only locally scoped symbols not referenced are removed.

Relocatable Objects

When performing a relocatable link with the -roption, dead procedure elimination is disabled since the only possible gain would be the removal of unreferenced local procedures. Objects resulting from a relocatable link are subject to dead procedure elimination upon a final link.

Affects on Symbolic Debugging

Any procedure that has symbolic debug information associated with it is not removed. Procedures that do not have symbolic debug information associated with them but are included in a debug link are removed if they are not referenced.

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Kenwood HP 9000 manual Complete Executables, Incomplete Executables, Shared Libraries, Relocatable Objects

HP 9000 specifications

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