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ieee_set_rounding_mode
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...