libc/src/fenv/fesetexceptflag.cpp

   1 //===-- Implementation of fesetexceptflag function ------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "src/fenv/fesetexceptflag.h"
  10 #include "hdr/types/fexcept_t.h"
  11 #include "src/__support/FPUtil/FEnvImpl.h"
  12 #include "src/__support/common.h"
  13 #include "src/__support/macros/config.h"
  14
  15 namespace LIBC_NAMESPACE_DECL {
  16
  17 LLVM_LIBC_FUNCTION(int, fesetexceptflag,
  18                    (const fexcept_t *flagp, int excepts)) {
  19   // Since the return type of fetestexcept is int, we ensure that fexcept_t
  20   // can fit in int type.
  21   static_assert(sizeof(int) >= sizeof(fexcept_t),
  22                 "fexcept_t value cannot fit in an int value.");
  23   int excepts_to_set = static_cast<int>(*flagp) & excepts;
  24   fputil::clear_except(FE_ALL_EXCEPT);
  25   return fputil::set_except(excepts_to_set);
  26 }
  27
  28 } // namespace LIBC_NAMESPACE_DECL