fesetround problem

David Matthews dm@prolingua.co.uk
Tue May 1 18:19:00 GMT 2012

fesetround seems to be broken in the current version of Cygwin.  It 
returns EINVAL for any argument other than FE_TONEAREST.  The following 
snippet works fine on Debian wheezy but shows a non-zero return in Cygwin.

#include <fenv.h>
#include <stdio.h>

int main()
     int r = fesetround(FE_TOWARDZERO);
     printf("fesetround returned %d.  Current rounding is %d\n",
            r, fegetround());
     return 0;

Browsing the CVS source it looks as though the problem is the line in 
fesetround in fenv.c that says:

   if (round & ~(FE_CW_ROUND_MASK >> FE_CW_PREC_SHIFT))

I think FE_CW_PREC_SHIFT should be FE_CW_ROUND_SHIFT to match fegetround 


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