Displaying 1 result from an estimated 1 matches for "fe_exceptions".
2016 Aug 18
5
fenv.h vs the optimizer
Howdy all,
I've been playing around with programs that use the C11 fenv.h.
It seems that, currently, the LLVM compiler does not regard to the
exception-flag side-effects of floating point operations?
When run on my macbook, the example code on
http://en.cppreference.com/w/c/numeric/fenv/FE_exceptions does not print
all the expected exceptions.
Other examples:
void foo() {
fesetround(FE_DOWNWARD);
printf("foo downward: %f\n", rint(0.5));
fesetround(FE_UPWARD);
printf("foo upward: %f\n", rint(0.5));
}
If compiled with optimization, only one call to rint...