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XUFLOW z/OS Language Environment Customization SA38-0685-00 |
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Derivation: eXponent Under FLOW XUFLOW specifies whether an exponent underflow causes a program interrupt. An exponent underflow occurs when a floating point number becomes too small to be represented. The underflow setting is determined at enclave initialization and is updated when new languages are introduced into the application (via fetch or dynamic call, for example). Otherwise, it does not vary while the application is running. Language Environment preserves the language semantics for C/C++ and COBOL regardless of the XUFLOW setting. Language Environment preserves the language semantics for PL/I only when XUFLOW is set to AUTO or ON. Language Environment does not preserve the language semantics for PL/I when XUFLOW is set to OFF. An exponent underflow caused by a C/C++ or COBOL program does not cause a condition to be raised.
Syntax .-AUTO-. .-OVR----. >>-XUFLOW--=--(--(--+-ON---+--)--,--+-NONOVR-+--)-------------->< '-OFF--'
z/OS® UNIX considerationsThe XUFLOW option applies to the entire enclave and all threads within. Usage notes
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