This chapter describes compatibility between AMODE 31 XPLINK and non-XPLINK programs.

Extra Performance Linkage (XPLINK) offers enhanced linkage between programs, potentially increasing performance significantly when frequent calls are made between small programs. The main focus of XPLINK is to improve speed and efficiency of subroutine calls, through a downward-growing stack, and by passing parameters in registers. Secondary objectives include reducing the function footprint and removing restrictions on function pointers for C and C++ functions compiled with XPLINK. For more information, see z/OS Language Environment Programming Guide.

XPLINK applications are supported under the IMS™ environment.