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/properties/architectures.h"
  14
  15 #if !defined(LIBC_TARGET_ARCH_IS_AARCH64)
  16 #error "Invalid include"
  17 #endif
  18
  19 namespace __llvm_libc {
  20 namespace fputil {
  21
  22 LIBC_INLINE float nearest_integer(float x) {
  23   float result;
  24   __asm__ __volatile__("frintn %s0, %s1\n\t" : "=w"(result) : "w"(x));
  25   return result;
  26 }
  27
  28 LIBC_INLINE double nearest_integer(double x) {
  29   double result;
  30   __asm__ __volatile__("frintn %d0, %d1\n\t" : "=w"(result) : "w"(x));
  31   return result;
  32 }
  33
  34 } // namespace fputil
  35 } // namespace __llvm_libc
  36
  37 #endif // LLVM_LIBC_SRC_SUPPORT_FPUTIL_AARCH64_NEAREST_INTEGER_H