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1 //===--- Round floating point to nearest integer on x86-64 ------*- 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_X86_64_NEAREST_INTEGER_H
10 #define LLVM_LIBC_SRC___SUPPORT_FPUTIL_X86_64_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_X86_64)
16 #error "Invalid include"
17 #endif
18 
19 #if !defined(__SSE4_2__)
20 #error "SSE4.2 instruction set is not supported"
21 #endif
22 
23 #include <immintrin.h>
24 
25 namespace LIBC_NAMESPACE {
26 namespace fputil {
27 
nearest_integer(float x)28 LIBC_INLINE float nearest_integer(float x) {
29   __m128 xmm = _mm_set_ss(x); // NOLINT
30   __m128 ymm =
31       _mm_round_ss(xmm, xmm, _MM_ROUND_NEAREST | _MM_FROUND_NO_EXC); // NOLINT
32   return ymm[0];
33 }
34 
nearest_integer(double x)35 LIBC_INLINE double nearest_integer(double x) {
36   __m128d xmm = _mm_set_sd(x); // NOLINT
37   __m128d ymm =
38       _mm_round_sd(xmm, xmm, _MM_ROUND_NEAREST | _MM_FROUND_NO_EXC); // NOLINT
39   return ymm[0];
40 }
41 
42 } // namespace fputil
43 } // namespace LIBC_NAMESPACE
44 
45 #endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_X86_64_NEAREST_INTEGER_H
46