prfchwintrin.h (2108B) - Raw
1 /*===---- prfchwintrin.h - PREFETCHW intrinsic -----------------------------=== 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 #if !defined(__X86INTRIN_H) && !defined(_MM3DNOW_H_INCLUDED) 11 #error "Never use <prfchwintrin.h> directly; include <x86intrin.h> instead." 12 #endif 13 14 #ifndef __PRFCHWINTRIN_H 15 #define __PRFCHWINTRIN_H 16 17 /// Loads a memory sequence containing the specified memory address into 18 /// all data cache levels. 19 /// 20 /// The cache-coherency state is set to exclusive. Data can be read from 21 /// and written to the cache line without additional delay. 22 /// 23 /// \headerfile <x86intrin.h> 24 /// 25 /// This intrinsic corresponds to the \c PREFETCHT0 instruction. 26 /// 27 /// \param __P 28 /// A pointer specifying the memory address to be prefetched. 29 static __inline__ void __attribute__((__always_inline__, __nodebug__)) 30 _m_prefetch(void *__P) 31 { 32 __builtin_prefetch (__P, 0, 3 /* _MM_HINT_T0 */); 33 } 34 35 /// Loads a memory sequence containing the specified memory address into 36 /// the L1 data cache and sets the cache-coherency state to modified. 37 /// 38 /// This provides a hint to the processor that the cache line will be 39 /// modified. It is intended for use when the cache line will be written to 40 /// shortly after the prefetch is performed. 41 /// 42 /// Note that the effect of this intrinsic is dependent on the processor 43 /// implementation. 44 /// 45 /// \headerfile <x86intrin.h> 46 /// 47 /// This intrinsic corresponds to the \c PREFETCHW instruction. 48 /// 49 /// \param __P 50 /// A pointer specifying the memory address to be prefetched. 51 static __inline__ void __attribute__((__always_inline__, __nodebug__)) 52 _m_prefetchw(volatile const void *__P) 53 { 54 #pragma clang diagnostic push 55 #pragma clang diagnostic ignored "-Wcast-qual" 56 __builtin_prefetch ((const void*)__P, 1, 3 /* _MM_HINT_T0 */); 57 #pragma clang diagnostic pop 58 } 59 60 #endif /* __PRFCHWINTRIN_H */