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1/*===---- bmi2intrin.h - BMI2 intrinsics -----------------------------------===
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
10#ifndef __IMMINTRIN_H
11#error "Never use <bmi2intrin.h> directly; include <immintrin.h> instead."
12#endif
13
14#ifndef __BMI2INTRIN_H
15#define __BMI2INTRIN_H
16
17/* Define the default attributes for the functions in this file. */
18#if defined(__cplusplus) && (__cplusplus >= 201103L)
19#define __DEFAULT_FN_ATTRS \
20 __attribute__((__always_inline__, __nodebug__, __target__("bmi2"))) constexpr
21#else
22#define __DEFAULT_FN_ATTRS \
23 __attribute__((__always_inline__, __nodebug__, __target__("bmi2")))
24#endif
25
26/// Copies the unsigned 32-bit integer \a __X and zeroes the upper bits
27/// starting at bit number \a __Y.
28///
29/// \code{.operation}
30/// i := __Y[7:0]
31/// result := __X
32/// IF i < 32
33/// result[31:i] := 0
34/// FI
35/// \endcode
36///
37/// \headerfile <immintrin.h>
38///
39/// This intrinsic corresponds to the \c BZHI instruction.
40///
41/// \param __X
42/// The 32-bit source value to copy.
43/// \param __Y
44/// The lower 8 bits specify the bit number of the lowest bit to zero.
45/// \returns The partially zeroed 32-bit value.
46static __inline__ unsigned int __DEFAULT_FN_ATTRS
47_bzhi_u32(unsigned int __X, unsigned int __Y) {
48 return __builtin_ia32_bzhi_si(__X, __Y);
49}
50
51/// Deposit (scatter) low-order bits from the unsigned 32-bit integer \a __X
52/// into the 32-bit result, according to the mask in the unsigned 32-bit
53/// integer \a __Y. All other bits of the result are zero.
54///
55/// \code{.operation}
56/// i := 0
57/// result := 0
58/// FOR m := 0 TO 31
59/// IF __Y[m] == 1
60/// result[m] := __X[i]
61/// i := i + 1
62/// ENDIF
63/// ENDFOR
64/// \endcode
65///
66/// \headerfile <immintrin.h>
67///
68/// This intrinsic corresponds to the \c PDEP instruction.
69///
70/// \param __X
71/// The 32-bit source value to copy.
72/// \param __Y
73/// The 32-bit mask specifying where to deposit source bits.
74/// \returns The 32-bit result.
75static __inline__ unsigned int __DEFAULT_FN_ATTRS
76_pdep_u32(unsigned int __X, unsigned int __Y) {
77 return __builtin_ia32_pdep_si(__X, __Y);
78}
79
80/// Extract (gather) bits from the unsigned 32-bit integer \a __X into the
81/// low-order bits of the 32-bit result, according to the mask in the
82/// unsigned 32-bit integer \a __Y. All other bits of the result are zero.
83///
84/// \code{.operation}
85/// i := 0
86/// result := 0
87/// FOR m := 0 TO 31
88/// IF __Y[m] == 1
89/// result[i] := __X[m]
90/// i := i + 1
91/// ENDIF
92/// ENDFOR
93/// \endcode
94///
95/// \headerfile <immintrin.h>
96///
97/// This intrinsic corresponds to the \c PEXT instruction.
98///
99/// \param __X
100/// The 32-bit source value to copy.
101/// \param __Y
102/// The 32-bit mask specifying which source bits to extract.
103/// \returns The 32-bit result.
104static __inline__ unsigned int __DEFAULT_FN_ATTRS
105_pext_u32(unsigned int __X, unsigned int __Y) {
106 return __builtin_ia32_pext_si(__X, __Y);
107}
108
109/// Multiplies the unsigned 32-bit integers \a __X and \a __Y to form a
110/// 64-bit product. Stores the upper 32 bits of the product in the
111/// memory at \a __P and returns the lower 32 bits.
112///
113/// \code{.operation}
114/// Store32(__P, (__X * __Y)[63:32])
115/// result := (__X * __Y)[31:0]
116/// \endcode
117///
118/// \headerfile <immintrin.h>
119///
120/// This intrinsic corresponds to the \c MULX instruction.
121///
122/// \param __X
123/// An unsigned 32-bit multiplicand.
124/// \param __Y
125/// An unsigned 32-bit multiplicand.
126/// \param __P
127/// A pointer to memory for storing the upper half of the product.
128/// \returns The lower half of the product.
129static __inline__ unsigned int __DEFAULT_FN_ATTRS
130_mulx_u32(unsigned int __X, unsigned int __Y, unsigned int *__P) {
131 unsigned long long __res = (unsigned long long) __X * __Y;
132 *__P = (unsigned int)(__res >> 32);
133 return (unsigned int)__res;
134}
135
136#ifdef __x86_64__
137
138/// Copies the unsigned 64-bit integer \a __X and zeroes the upper bits
139/// starting at bit number \a __Y.
140///
141/// \code{.operation}
142/// i := __Y[7:0]
143/// result := __X
144/// IF i < 64
145/// result[63:i] := 0
146/// FI
147/// \endcode
148///
149/// \headerfile <immintrin.h>
150///
151/// This intrinsic corresponds to the \c BZHI instruction.
152///
153/// \param __X
154/// The 64-bit source value to copy.
155/// \param __Y
156/// The lower 8 bits specify the bit number of the lowest bit to zero.
157/// \returns The partially zeroed 64-bit value.
158static __inline__ unsigned long long __DEFAULT_FN_ATTRS
159_bzhi_u64(unsigned long long __X, unsigned long long __Y) {
160 return __builtin_ia32_bzhi_di(__X, __Y);
161}
162
163/// Deposit (scatter) low-order bits from the unsigned 64-bit integer \a __X
164/// into the 64-bit result, according to the mask in the unsigned 64-bit
165/// integer \a __Y. All other bits of the result are zero.
166///
167/// \code{.operation}
168/// i := 0
169/// result := 0
170/// FOR m := 0 TO 63
171/// IF __Y[m] == 1
172/// result[m] := __X[i]
173/// i := i + 1
174/// ENDIF
175/// ENDFOR
176/// \endcode
177///
178/// \headerfile <immintrin.h>
179///
180/// This intrinsic corresponds to the \c PDEP instruction.
181///
182/// \param __X
183/// The 64-bit source value to copy.
184/// \param __Y
185/// The 64-bit mask specifying where to deposit source bits.
186/// \returns The 64-bit result.
187static __inline__ unsigned long long __DEFAULT_FN_ATTRS
188_pdep_u64(unsigned long long __X, unsigned long long __Y) {
189 return __builtin_ia32_pdep_di(__X, __Y);
190}
191
192/// Extract (gather) bits from the unsigned 64-bit integer \a __X into the
193/// low-order bits of the 64-bit result, according to the mask in the
194/// unsigned 64-bit integer \a __Y. All other bits of the result are zero.
195///
196/// \code{.operation}
197/// i := 0
198/// result := 0
199/// FOR m := 0 TO 63
200/// IF __Y[m] == 1
201/// result[i] := __X[m]
202/// i := i + 1
203/// ENDIF
204/// ENDFOR
205/// \endcode
206///
207/// \headerfile <immintrin.h>
208///
209/// This intrinsic corresponds to the \c PEXT instruction.
210///
211/// \param __X
212/// The 64-bit source value to copy.
213/// \param __Y
214/// The 64-bit mask specifying which source bits to extract.
215/// \returns The 64-bit result.
216static __inline__ unsigned long long __DEFAULT_FN_ATTRS
217_pext_u64(unsigned long long __X, unsigned long long __Y) {
218 return __builtin_ia32_pext_di(__X, __Y);
219}
220
221/// Multiplies the unsigned 64-bit integers \a __X and \a __Y to form a
222/// 128-bit product. Stores the upper 64 bits of the product to the
223/// memory addressed by \a __P and returns the lower 64 bits.
224///
225/// \code{.operation}
226/// Store64(__P, (__X * __Y)[127:64])
227/// result := (__X * __Y)[63:0]
228/// \endcode
229///
230/// \headerfile <immintrin.h>
231///
232/// This intrinsic corresponds to the \c MULX instruction.
233///
234/// \param __X
235/// An unsigned 64-bit multiplicand.
236/// \param __Y
237/// An unsigned 64-bit multiplicand.
238/// \param __P
239/// A pointer to memory for storing the upper half of the product.
240/// \returns The lower half of the product.
241static __inline__ unsigned long long __DEFAULT_FN_ATTRS
242_mulx_u64 (unsigned long long __X, unsigned long long __Y,
243 unsigned long long *__P) {
244 unsigned __int128 __res = (unsigned __int128) __X * __Y;
245 *__P = (unsigned long long) (__res >> 64);
246 return (unsigned long long) __res;
247}
248
249#endif /* __x86_64__ */
250
251#undef __DEFAULT_FN_ATTRS
252
253#endif /* __BMI2INTRIN_H */