derek.holloway
7502bf64a4
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50 lines
1.4 KiB
C
50 lines
1.4 KiB
C
/*===---------------- hresetintrin.h - HRESET intrinsics -------------------===
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*
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* Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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* See https://llvm.org/LICENSE.txt for license information.
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* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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*
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*===-----------------------------------------------------------------------===
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*/
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#ifndef __X86GPRINTRIN_H
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#error "Never use <hresetintrin.h> directly; include <x86gprintrin.h> instead."
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#endif
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#ifndef __HRESETINTRIN_H
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#define __HRESETINTRIN_H
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#if __has_extension(gnu_asm)
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/* Define the default attributes for the functions in this file. */
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#define __DEFAULT_FN_ATTRS \
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__attribute__((__always_inline__, __nodebug__, __target__("hreset")))
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/// Provides a hint to the processor to selectively reset the prediction
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/// history of the current logical processor specified by a 32-bit integer
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/// value \a __eax.
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///
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/// This intrinsic corresponds to the <c> HRESET </c> instruction.
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///
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/// \code{.operation}
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/// IF __eax == 0
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/// // nop
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/// ELSE
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/// FOR i := 0 to 31
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/// IF __eax[i]
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/// ResetPredictionFeature(i)
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/// FI
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/// ENDFOR
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/// FI
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/// \endcode
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static __inline void __DEFAULT_FN_ATTRS
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_hreset(int __eax)
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{
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__asm__ ("hreset $0" :: "a"(__eax));
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}
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#undef __DEFAULT_FN_ATTRS
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#endif /* __has_extension(gnu_asm) */
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#endif /* __HRESETINTRIN_H */
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