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 "src/__support/FPUtil/FEnvUtils.h"
11 #include "src/__support/common.h"
12 
13 #include <fenv.h>
14 
15 namespace __llvm_libc {
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<const int>(*flagp) & excepts;
24   fputil::clearExcept(FE_ALL_EXCEPT);
25   return fputil::setExcept(excepts_to_set);
26 }
27 
28 } // namespace __llvm_libc
29