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1 /*===---- lzcntintrin.h - LZCNT intrinsics ---------------------------------===
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2 *
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3 * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 * See https://llvm.org/LICENSE.txt for license information.
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5 * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 *
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7 *===-----------------------------------------------------------------------===
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8 */
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9
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10 #if !defined __X86INTRIN_H && !defined __IMMINTRIN_H
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11 #error "Never use <lzcntintrin.h> directly; include <x86intrin.h> instead."
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12 #endif
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13
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14 #ifndef __LZCNTINTRIN_H
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15 #define __LZCNTINTRIN_H
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16
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17 /* Define the default attributes for the functions in this file. */
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18 #define __DEFAULT_FN_ATTRS __attribute__((__always_inline__, __nodebug__, __target__("lzcnt")))
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19
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20 #ifndef _MSC_VER
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21 /// Counts the number of leading zero bits in the operand.
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22 ///
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23 /// \headerfile <x86intrin.h>
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24 ///
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25 /// This intrinsic corresponds to the \c LZCNT instruction.
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26 ///
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27 /// \param __X
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28 /// An unsigned 16-bit integer whose leading zeros are to be counted.
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29 /// \returns An unsigned 16-bit integer containing the number of leading zero
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30 /// bits in the operand.
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31 #define __lzcnt16(X) __builtin_ia32_lzcnt_u16((unsigned short)(X))
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32 #endif // _MSC_VER
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33
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34 /// Counts the number of leading zero bits in the operand.
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35 ///
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36 /// \headerfile <x86intrin.h>
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37 ///
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38 /// This intrinsic corresponds to the \c LZCNT instruction.
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39 ///
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40 /// \param __X
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41 /// An unsigned 32-bit integer whose leading zeros are to be counted.
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42 /// \returns An unsigned 32-bit integer containing the number of leading zero
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43 /// bits in the operand.
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44 /// \see _lzcnt_u32
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45 static __inline__ unsigned int __DEFAULT_FN_ATTRS
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46 __lzcnt32(unsigned int __X)
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47 {
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48 return __builtin_ia32_lzcnt_u32(__X);
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49 }
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50
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51 /// Counts the number of leading zero bits in the operand.
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52 ///
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53 /// \headerfile <x86intrin.h>
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54 ///
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55 /// This intrinsic corresponds to the \c LZCNT instruction.
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56 ///
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57 /// \param __X
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58 /// An unsigned 32-bit integer whose leading zeros are to be counted.
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59 /// \returns An unsigned 32-bit integer containing the number of leading zero
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60 /// bits in the operand.
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61 /// \see __lzcnt32
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62 static __inline__ unsigned int __DEFAULT_FN_ATTRS
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63 _lzcnt_u32(unsigned int __X)
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64 {
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65 return __builtin_ia32_lzcnt_u32(__X);
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66 }
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67
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68 #ifdef __x86_64__
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69 #ifndef _MSC_VER
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70 /// Counts the number of leading zero bits in the operand.
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71 ///
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72 /// \headerfile <x86intrin.h>
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73 ///
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74 /// This intrinsic corresponds to the \c LZCNT instruction.
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75 ///
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76 /// \param __X
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77 /// An unsigned 64-bit integer whose leading zeros are to be counted.
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78 /// \returns An unsigned 64-bit integer containing the number of leading zero
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79 /// bits in the operand.
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80 /// \see _lzcnt_u64
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81 #define __lzcnt64(X) __builtin_ia32_lzcnt_u64((unsigned long long)(X))
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82 #endif // _MSC_VER
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83
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84 /// Counts the number of leading zero bits in the operand.
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85 ///
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86 /// \headerfile <x86intrin.h>
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87 ///
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88 /// This intrinsic corresponds to the \c LZCNT instruction.
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89 ///
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90 /// \param __X
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91 /// An unsigned 64-bit integer whose leading zeros are to be counted.
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92 /// \returns An unsigned 64-bit integer containing the number of leading zero
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93 /// bits in the operand.
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94 /// \see __lzcnt64
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95 static __inline__ unsigned long long __DEFAULT_FN_ATTRS
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96 _lzcnt_u64(unsigned long long __X)
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97 {
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98 return __builtin_ia32_lzcnt_u64(__X);
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99 }
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100 #endif
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101
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102 #undef __DEFAULT_FN_ATTRS
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103
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104 #endif /* __LZCNTINTRIN_H */
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