uclibc-ng/libm/kvx/feholdexcept.c

/*
  (C) Copyright 2019 Kalray S.A.
  This file provides feholdexcept for the Coolidge processor.
*/

#include <fenv.h>

int feholdexcept(fenv_t *envp)
{
  /* Get the current environment ($cs) */
  fenv_t fe;
  fe = __builtin_kvx_get(KVX_SFR_CS);

  /* Mask $cs status to keep exception flags and rounding mode only. */
  *envp = (fe & (FE_ALL_EXCEPT | FE_RND_MASK));

  /* Set $cs with 'FE_ALL_EXCEPT' as a clear mask. */
  __builtin_kvx_wfxl(KVX_SFR_CS, FE_ALL_EXCEPT);
  
  /* KVX does not raise FP traps so it is always in a "non-stop" mode */

  /* The above insn cannot fail (while the OS allows access to the
     floating-point exception flags of the $cs register). Return
     success. */
  return 0;
}