libc/src/__support/FPUtil/aarch64/nearest_integer.h

   1 //===--- Round floating point to nearest integer on aarch64 -----*- C++ -*-===//
   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 #ifndef LLVM_LIBC_SRC___SUPPORT_FPUTIL_AARCH64_NEAREST_INTEGER_H
  10 #define LLVM_LIBC_SRC___SUPPORT_FPUTIL_AARCH64_NEAREST_INTEGER_H
  11
  12 #include "src/__support/common.h"
  13 #include "src/__support/macros/config.h"
  14 #include "src/__support/macros/properties/architectures.h"
  15
  16 #if !defined(LIBC_TARGET_ARCH_IS_AARCH64)
  17 #error "Invalid include"
  18 #endif
  19
  20 namespace LIBC_NAMESPACE_DECL {
  21 namespace fputil {
  22
  23 LIBC_INLINE float nearest_integer(float x) {
  24   float result;
  25   __asm__ __volatile__("frintn %s0, %s1\n\t" : "=w"(result) : "w"(x));
  26   return result;
  27 }
  28
  29 LIBC_INLINE double nearest_integer(double x) {
  30   double result;
  31   __asm__ __volatile__("frintn %d0, %d1\n\t" : "=w"(result) : "w"(x));
  32   return result;
  33 }
  34
  35 } // namespace fputil
  36 } // namespace LIBC_NAMESPACE_DECL
  37
  38 #endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_AARCH64_NEAREST_INTEGER_H