forked from OSchip/llvm-project
50 lines
1.4 KiB
C
50 lines
1.4 KiB
C
|
/*===---------------- hresetintrin.h - HRESET intrinsics -------------------===
|
||
|
|
*
|
||
|
|
* Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
||
|
|
* See https://llvm.org/LICENSE.txt for license information.
|
||
|
|
* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
||
|
|
*
|
||
|
|
*===-----------------------------------------------------------------------===
|
||
|
|
*/
|
||
|
|
#ifndef __X86GPRINTRIN_H
|
||
|
|
#error "Never use <hresetintrin.h> directly; include <x86gprintrin.h> instead."
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifndef __HRESETINTRIN_H
|
||
|
|
#define __HRESETINTRIN_H
|
||
|
|
|
||
|
|
#if __has_extension(gnu_asm)
|
||
|
|
|
||
|
|
/* Define the default attributes for the functions in this file. */
|
||
|
|
#define __DEFAULT_FN_ATTRS \
|
||
|
|
__attribute__((__always_inline__, __nodebug__, __target__("hreset")))
|
||
|
|
|
||
|
|
/// Provides a hint to the processor to selectively reset the prediction
|
||
|
|
/// history of the current logical processor specified by a 32-bit integer
|
||
|
|
/// value \a __eax.
|
||
|
|
///
|
||
|
|
/// This intrinsic corresponds to the <c> HRESET </c> instruction.
|
||
|
|
///
|
||
|
|
/// \operation
|
||
|
|
/// IF __eax == 0
|
||
|
|
/// // nop
|
||
|
|
/// ELSE
|
||
|
|
/// FOR i := 0 to 31
|
||
|
|
/// IF __eax[i]
|
||
|
|
/// ResetPredictionFeature(i)
|
||
|
|
/// FI
|
||
|
|
/// ENDFOR
|
||
|
|
/// FI
|
||
|
|
/// \endoperation
|
||
|
|
static __inline void __DEFAULT_FN_ATTRS
|
||
|
|
_hreset(int __eax)
|
||
|
|
{
|
||
|
|
__asm__ ("hreset $0" :: "a"(__eax));
|
||
|
|
}
|
||
|
|
|
||
|
|
#undef __DEFAULT_FN_ATTRS
|
||
|
|
|
||
|
|
#endif /* __has_extension(gnu_asm) */
|
||
|
|
|
||
|
|
#endif /* __HRESETINTRIN_H */
|