Exploiting z/Architecture HGPRs with COBOL
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Enterprise COBOL V5 provides increased exploitation of the latest z/Architecture processors, as well as new levels of optimization, to improve the performance of z/OS COBOL applications.
The HGPR option controls the compiler usage of the 64-bit registers provided by z/Architecture processors, and its syntax is as follows:
with the PRESERVE as the default option.
The Enterprise COBOL compiler exploits the full 64-bit width of the z/Architecture General Purpose Registers (GPRs). HGPR stands for "High-halves of 64-bit GPRs", which refers to the use of native 64-bit instructions.