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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/config.h" |
| 14 | #include "src/__support/macros/properties/architectures.h" |
| 15 | |
| 16 | #if !defined(LIBC_TARGET_ARCH_IS_X86_64) |
| 17 | #error "Invalid include" |
| 18 | #endif |
| 19 | |
| 20 | #if !defined(__SSE4_2__) |
| 21 | #error "SSE4.2 instruction set is not supported" |
| 22 | #endif |
| 23 | |
| 24 | #include <immintrin.h> |
| 25 | |
| 26 | namespace LIBC_NAMESPACE_DECL { |
| 27 | namespace fputil { |
| 28 | |
| 29 | LIBC_INLINE float nearest_integer(float x) { |
| 30 | __m128 xmm = _mm_set_ss(x); // NOLINT |
| 31 | __m128 ymm = |
| 32 | _mm_round_ss(xmm, xmm, _MM_ROUND_NEAREST | _MM_FROUND_NO_EXC); // NOLINT |
| 33 | return ymm[0]; |
| 34 | } |
| 35 | |
| 36 | LIBC_INLINE double nearest_integer(double x) { |
| 37 | __m128d xmm = _mm_set_sd(x); // NOLINT |
| 38 | __m128d ymm = |
| 39 | _mm_round_sd(xmm, xmm, _MM_ROUND_NEAREST | _MM_FROUND_NO_EXC); // NOLINT |
| 40 | return ymm[0]; |
| 41 | } |
| 42 | |
| 43 | } // namespace fputil |
| 44 | } // namespace LIBC_NAMESPACE_DECL |
| 45 | |
| 46 | #endif // LLVM_LIBC_SRC___SUPPORT_FPUTIL_X86_64_NEAREST_INTEGER_H |
| 47 |
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