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2018 Jan 12
0
[cfe-dev] Why is #pragma STDC FENV_ACCESS not supported?
...tions outside of            loops, improving performance.            The default, ACCURACY_SENSITIVE, directs the compiler to use            only certain scalar rules for calculations.  This setting can            prevent some optimization. if you pick DYNAMIC, you can then use a system call (SYS$IEEE_SET_ROUNDING_MODE) to change the value.  We warn in our manuals that /ROUNDING=DYNAMIC may have a significant performance impact.  The idea is that you set the mode [the routine returns the prior mode], do you work, put the old mode back.  You would collect such code into its own module and compile with with DYNAMI...