PR47099: Split <intrin0.h> out of <intrin.h>.

[rsmith]

Summary

This aims to be compatible with Visual C++'s <intrin0.h>, but not
exactly match it. The contents of <intrin0.h> are a subset of <intrin.h>
that provide the parts that the STL needs without pulling in all of
<immintrin.h>. We don't want to hardcode exactly which things are in
<intrin0.h>, as that changes over time depending on the needs of the
STL, so instead include all the MS-specific functions, and none of the
<immintrin.h> functions except for the ones that we know the MS STL
needs -- specifically, _tzcnt_u*.

clang/lib/Headers/CMakeLists.txt

set(files
   fmaintrin.h
   fxsrintrin.h
   gfniintrin.h
   htmintrin.h
   htmxlintrin.h
   ia32intrin.h
   immintrin.h
   intrin.h
+  intrin0.h
   inttypes.h
   invpcidintrin.h
   iso646.h
   limits.h
   lwpintrin.h
   lzcntintrin.h
   mm3dnow.h
   mmintrin.h

clang/lib/Headers/bmiintrin.h

 /*===---- bmiintrin.h - BMI 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
  *
  *===-----------------------------------------------------------------------===
  */
 
-#if !defined __X86INTRIN_H && !defined __IMMINTRIN_H
+#if !defined __X86INTRIN_H && !defined __IMMINTRIN_H && \
+    !defined __CLANG_INTRIN0_H
 #error "Never use <bmiintrin.h> directly; include <x86intrin.h> instead."
 #endif
 
 #ifndef __BMIINTRIN_H
 #define __BMIINTRIN_H
 
 /* Allow using the tzcnt intrinsics even for non-BMI targets. Since the TZCNT
    instruction behaves as BSF on non-BMI targets, there is code that expects
    to use it as a potentially faster version of BSF. */

clang/lib/Headers/intrin.h

 /* ===-------- intrin.h ---------------------------------------------------===
  *
  * 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 __CLANG_INTRIN_H
+#define __CLANG_INTRIN_H
+
 /* Only include this if we're compiling for the windows platform. */
 #ifndef _MSC_VER
 #include_next <intrin.h>
 #else
 
-#ifndef __INTRIN_H
-#define __INTRIN_H
-
 /* First include the standard intrinsics. */
 #if defined(__i386__) || defined(__x86_64__)
 #include <x86intrin.h>
 #endif
 
 #if defined(__arm__)
 #include <armintr.h>
 #endif
 
 #if defined(__aarch64__)
 #include <arm64intr.h>
 #endif
 
 /* For the definition of jmp_buf. */
 #if __STDC_HOSTED__
 #include <setjmp.h>
 #endif
 
-/* Define the default attributes for the functions in this file. */
-#define __DEFAULT_FN_ATTRS __attribute__((__always_inline__, __nodebug__))
-
-#if __x86_64__
-#define __LPTRINT_TYPE__ __int64
-#else
-#define __LPTRINT_TYPE__ long
-#endif
+/* Include the MSVC-specific intrinsics. */
+#include <intrin0.h>
 
+#if defined(__MMX__)
 #ifdef __cplusplus
 extern "C" {
 #endif
-
-#if defined(__MMX__)
 /* And the random ones that aren't in those files. */
 __m64 _m_from_float(float);
 float _m_to_float(__m64);
-#endif
-
-/* Other assorted instruction intrinsics. */
-void __addfsbyte(unsigned long, unsigned char);
-void __addfsdword(unsigned long, unsigned long);
-void __addfsword(unsigned long, unsigned short);
-void __code_seg(const char *);
-static __inline__
-void __cpuid(int[4], int);
-static __inline__
-void __cpuidex(int[4], int, int);
-static __inline__
-__int64 __emul(int, int);
-static __inline__
-unsigned __int64 __emulu(unsigned int, unsigned int);
-unsigned int __getcallerseflags(void);
-static __inline__
-void __halt(void);
-unsigned char __inbyte(unsigned short);
-void __inbytestring(unsigned short, unsigned char *, unsigned long);
-void __incfsbyte(unsigned long);
-void __incfsdword(unsigned long);
-void __incfsword(unsigned long);
-unsigned long __indword(unsigned short);
-void __indwordstring(unsigned short, unsigned long *, unsigned long);
-void __int2c(void);
-void __invlpg(void *);
-unsigned short __inword(unsigned short);
-void __inwordstring(unsigned short, unsigned short *, unsigned long);
-void __lidt(void *);
-unsigned __int64 __ll_lshift(unsigned __int64, int);
-__int64 __ll_rshift(__int64, int);
-static __inline__
-void __movsb(unsigned char *, unsigned char const *, size_t);
-static __inline__
-void __movsd(unsigned long *, unsigned long const *, size_t);
-static __inline__
-void __movsw(unsigned short *, unsigned short const *, size_t);
-static __inline__
-void __nop(void);
-void __nvreg_restore_fence(void);
-void __nvreg_save_fence(void);
-void __outbyte(unsigned short, unsigned char);
-void __outbytestring(unsigned short, unsigned char *, unsigned long);
-void __outdword(unsigned short, unsigned long);
-void __outdwordstring(unsigned short, unsigned long *, unsigned long);
-void __outword(unsigned short, unsigned short);
-void __outwordstring(unsigned short, unsigned short *, unsigned long);
-unsigned long __readcr0(void);
-unsigned long __readcr2(void);
-unsigned __LPTRINT_TYPE__ __readcr3(void);
-unsigned long __readcr4(void);
-unsigned long __readcr8(void);
-unsigned int __readdr(unsigned int);
-#ifdef __i386__
-static __inline__
-unsigned char __readfsbyte(unsigned long);
-static __inline__
-unsigned __int64 __readfsqword(unsigned long);
-static __inline__
-unsigned short __readfsword(unsigned long);
-#endif
-static __inline__
-unsigned __int64 __readmsr(unsigned long);
-unsigned __int64 __readpmc(unsigned long);
-unsigned long __segmentlimit(unsigned long);
-void __sidt(void *);
-static __inline__
-void __stosb(unsigned char *, unsigned char, size_t);
-static __inline__
-void __stosd(unsigned long *, unsigned long, size_t);
-static __inline__
-void __stosw(unsigned short *, unsigned short, size_t);
-void __svm_clgi(void);
-void __svm_invlpga(void *, int);
-void __svm_skinit(int);
-void __svm_stgi(void);
-void __svm_vmload(size_t);
-void __svm_vmrun(size_t);
-void __svm_vmsave(size_t);
-void __ud2(void);
-unsigned __int64 __ull_rshift(unsigned __int64, int);
-void __vmx_off(void);
-void __vmx_vmptrst(unsigned __int64 *);
-void __wbinvd(void);
-void __writecr0(unsigned int);
-static __inline__
-void __writecr3(unsigned __INTPTR_TYPE__);
-void __writecr4(unsigned int);
-void __writecr8(unsigned int);
-void __writedr(unsigned int, unsigned int);
-void __writefsbyte(unsigned long, unsigned char);
-void __writefsdword(unsigned long, unsigned long);
-void __writefsqword(unsigned long, unsigned __int64);
-void __writefsword(unsigned long, unsigned short);
-void __writemsr(unsigned long, unsigned __int64);
-static __inline__
-void *_AddressOfReturnAddress(void);
-static __inline__
-unsigned char _BitScanForward(unsigned long *_Index, unsigned long _Mask);
-static __inline__
-unsigned char _BitScanReverse(unsigned long *_Index, unsigned long _Mask);
-unsigned char _bittest(long const *, long);
-unsigned char _bittestandcomplement(long *, long);
-unsigned char _bittestandreset(long *, long);
-unsigned char _bittestandset(long *, long);
-void __cdecl _disable(void);
-void __cdecl _enable(void);
-long _InterlockedAddLargeStatistic(__int64 volatile *_Addend, long _Value);
-unsigned char _interlockedbittestandreset(long volatile *, long);
-unsigned char _interlockedbittestandset(long volatile *, long);
-void *_InterlockedCompareExchangePointer_HLEAcquire(void *volatile *, void *,
-                                                    void *);
-void *_InterlockedCompareExchangePointer_HLERelease(void *volatile *, void *,
-                                                    void *);
-long _InterlockedExchangeAdd_HLEAcquire(long volatile *, long);
-long _InterlockedExchangeAdd_HLERelease(long volatile *, long);
-__int64 _InterlockedExchangeAdd64_HLEAcquire(__int64 volatile *, __int64);
-__int64 _InterlockedExchangeAdd64_HLERelease(__int64 volatile *, __int64);
-static __inline__ void
-__attribute__((__deprecated__("use other intrinsics or C++11 atomics instead")))
-_ReadBarrier(void);
-static __inline__ void
-__attribute__((__deprecated__("use other intrinsics or C++11 atomics instead")))
-_ReadWriteBarrier(void);
-unsigned int _rorx_u32(unsigned int, const unsigned int);
-int _sarx_i32(int, unsigned int);
-#if __STDC_HOSTED__
-int __cdecl _setjmp(jmp_buf);
-#endif
-unsigned int _shlx_u32(unsigned int, unsigned int);
-unsigned int _shrx_u32(unsigned int, unsigned int);
-void _Store_HLERelease(long volatile *, long);
-void _Store64_HLERelease(__int64 volatile *, __int64);
-void _StorePointer_HLERelease(void *volatile *, void *);
-static __inline__ void
-__attribute__((__deprecated__("use other intrinsics or C++11 atomics instead")))
-_WriteBarrier(void);
-unsigned __int32 xbegin(void);
-void _xend(void);
-
-/* These additional intrinsics are turned on in x64/amd64/x86_64 mode. */
-#ifdef __x86_64__
-void __addgsbyte(unsigned long, unsigned char);
-void __addgsdword(unsigned long, unsigned long);
-void __addgsqword(unsigned long, unsigned __int64);
-void __addgsword(unsigned long, unsigned short);
-static __inline__
-void __faststorefence(void);
-void __incgsbyte(unsigned long);
-void __incgsdword(unsigned long);
-void __incgsqword(unsigned long);
-void __incgsword(unsigned long);
-static __inline__
-void __movsq(unsigned long long *, unsigned long long const *, size_t);
-static __inline__
-unsigned char __readgsbyte(unsigned long);
-static __inline__
-unsigned long __readgsdword(unsigned long);
-static __inline__
-unsigned __int64 __readgsqword(unsigned long);
-unsigned short __readgsword(unsigned long);
-unsigned __int64 __shiftleft128(unsigned __int64 _LowPart,
-                                unsigned __int64 _HighPart,
-                                unsigned char _Shift);
-unsigned __int64 __shiftright128(unsigned __int64 _LowPart,
-                                 unsigned __int64 _HighPart,
-                                 unsigned char _Shift);
-static __inline__
-void __stosq(unsigned __int64 *, unsigned __int64, size_t);
-unsigned char __vmx_on(unsigned __int64 *);
-unsigned char __vmx_vmclear(unsigned __int64 *);
-unsigned char __vmx_vmlaunch(void);
-unsigned char __vmx_vmptrld(unsigned __int64 *);
-unsigned char __vmx_vmread(size_t, size_t *);
-unsigned char __vmx_vmresume(void);
-unsigned char __vmx_vmwrite(size_t, size_t);
-void __writegsbyte(unsigned long, unsigned char);
-void __writegsdword(unsigned long, unsigned long);
-void __writegsqword(unsigned long, unsigned __int64);
-void __writegsword(unsigned long, unsigned short);
-unsigned char _bittest64(__int64 const *, __int64);
-unsigned char _bittestandcomplement64(__int64 *, __int64);
-unsigned char _bittestandreset64(__int64 *, __int64);
-unsigned char _bittestandset64(__int64 *, __int64);
-long _InterlockedAnd_np(long volatile *_Value, long _Mask);
-short _InterlockedAnd16_np(short volatile *_Value, short _Mask);
-__int64 _InterlockedAnd64_np(__int64 volatile *_Value, __int64 _Mask);
-char _InterlockedAnd8_np(char volatile *_Value, char _Mask);
-unsigned char _interlockedbittestandreset64(__int64 volatile *, __int64);
-unsigned char _interlockedbittestandset64(__int64 volatile *, __int64);
-long _InterlockedCompareExchange_np(long volatile *_Destination, long _Exchange,
-                                    long _Comparand);
-unsigned char _InterlockedCompareExchange128(__int64 volatile *_Destination,
-                                             __int64 _ExchangeHigh,
-                                             __int64 _ExchangeLow,
-                                             __int64 *_CompareandResult);
-unsigned char _InterlockedCompareExchange128_np(__int64 volatile *_Destination,
-                                                __int64 _ExchangeHigh,
-                                                __int64 _ExchangeLow,
-                                                __int64 *_ComparandResult);
-short _InterlockedCompareExchange16_np(short volatile *_Destination,
-                                       short _Exchange, short _Comparand);
-__int64 _InterlockedCompareExchange64_np(__int64 volatile *_Destination,
-                                         __int64 _Exchange, __int64 _Comparand);
-void *_InterlockedCompareExchangePointer_np(void *volatile *_Destination,
-                                            void *_Exchange, void *_Comparand);
-long _InterlockedOr_np(long volatile *_Value, long _Mask);
-short _InterlockedOr16_np(short volatile *_Value, short _Mask);
-__int64 _InterlockedOr64_np(__int64 volatile *_Value, __int64 _Mask);
-char _InterlockedOr8_np(char volatile *_Value, char _Mask);
-long _InterlockedXor_np(long volatile *_Value, long _Mask);
-short _InterlockedXor16_np(short volatile *_Value, short _Mask);
-__int64 _InterlockedXor64_np(__int64 volatile *_Value, __int64 _Mask);
-char _InterlockedXor8_np(char volatile *_Value, char _Mask);
-unsigned __int64 _rorx_u64(unsigned __int64, const unsigned int);
-__int64 _sarx_i64(__int64, unsigned int);
-unsigned __int64 _shlx_u64(unsigned __int64, unsigned int);
-unsigned __int64 _shrx_u64(unsigned __int64, unsigned int);
-static __inline__
-__int64 __mulh(__int64, __int64);
-static __inline__
-unsigned __int64 __umulh(unsigned __int64, unsigned __int64);
-static __inline__
-__int64 _mul128(__int64, __int64, __int64*);
-static __inline__
-unsigned __int64 _umul128(unsigned __int64,
-                          unsigned __int64,
-                          unsigned __int64*);
-
-#endif /* __x86_64__ */
-
-#if defined(__x86_64__) || defined(__arm__) || defined(__aarch64__)
-
-static __inline__
-unsigned char _BitScanForward64(unsigned long *_Index, unsigned __int64 _Mask);
-static __inline__
-unsigned char _BitScanReverse64(unsigned long *_Index, unsigned __int64 _Mask);
-
-#endif
-
-#if defined(__i386__) || defined(__x86_64__) || defined(__arm__) || defined(__aarch64__)
-static __inline__
-__int64 _InterlockedDecrement64(__int64 volatile *_Addend);
-static __inline__
-__int64 _InterlockedExchange64(__int64 volatile *_Target, __int64 _Value);
-static __inline__
-__int64 _InterlockedExchangeAdd64(__int64 volatile *_Addend, __int64 _Value);
-static __inline__
-__int64 _InterlockedExchangeSub64(__int64 volatile *_Subend, __int64 _Value);
-static __inline__
-__int64 _InterlockedIncrement64(__int64 volatile *_Addend);
-static __inline__
-__int64 _InterlockedOr64(__int64 volatile *_Value, __int64 _Mask);
-static __inline__
-__int64 _InterlockedXor64(__int64 volatile *_Value, __int64 _Mask);
-static __inline__
-__int64 _InterlockedAnd64(__int64 volatile *_Value, __int64 _Mask);
-
-#endif
-
-/*----------------------------------------------------------------------------*\
-|* Interlocked Exchange Add
-\*----------------------------------------------------------------------------*/
-#if defined(__arm__) || defined(__aarch64__)
-char _InterlockedExchangeAdd8_acq(char volatile *_Addend, char _Value);
-char _InterlockedExchangeAdd8_nf(char volatile *_Addend, char _Value);
-char _InterlockedExchangeAdd8_rel(char volatile *_Addend, char _Value);
-short _InterlockedExchangeAdd16_acq(short volatile *_Addend, short _Value);
-short _InterlockedExchangeAdd16_nf(short volatile *_Addend, short _Value);
-short _InterlockedExchangeAdd16_rel(short volatile *_Addend, short _Value);
-long _InterlockedExchangeAdd_acq(long volatile *_Addend, long _Value);
-long _InterlockedExchangeAdd_nf(long volatile *_Addend, long _Value);
-long _InterlockedExchangeAdd_rel(long volatile *_Addend, long _Value);
-__int64 _InterlockedExchangeAdd64_acq(__int64 volatile *_Addend, __int64 _Value);
-__int64 _InterlockedExchangeAdd64_nf(__int64 volatile *_Addend, __int64 _Value);
-__int64 _InterlockedExchangeAdd64_rel(__int64 volatile *_Addend, __int64 _Value);
-#endif
-/*----------------------------------------------------------------------------*\
-|* Interlocked Increment
-\*----------------------------------------------------------------------------*/
-#if defined(__arm__) || defined(__aarch64__)
-short _InterlockedIncrement16_acq(short volatile *_Value);
-short _InterlockedIncrement16_nf(short volatile *_Value);
-short _InterlockedIncrement16_rel(short volatile *_Value);
-long _InterlockedIncrement_acq(long volatile *_Value);
-long _InterlockedIncrement_nf(long volatile *_Value);
-long _InterlockedIncrement_rel(long volatile *_Value);
-__int64 _InterlockedIncrement64_acq(__int64 volatile *_Value);
-__int64 _InterlockedIncrement64_nf(__int64 volatile *_Value);
-__int64 _InterlockedIncrement64_rel(__int64 volatile *_Value);
-#endif
-/*----------------------------------------------------------------------------*\
-|* Interlocked Decrement
-\*----------------------------------------------------------------------------*/
-#if defined(__arm__) || defined(__aarch64__)
-short _InterlockedDecrement16_acq(short volatile *_Value);
-short _InterlockedDecrement16_nf(short volatile *_Value);
-short _InterlockedDecrement16_rel(short volatile *_Value);
-long _InterlockedDecrement_acq(long volatile *_Value);
-long _InterlockedDecrement_nf(long volatile *_Value);
-long _InterlockedDecrement_rel(long volatile *_Value);
-__int64 _InterlockedDecrement64_acq(__int64 volatile *_Value);
-__int64 _InterlockedDecrement64_nf(__int64 volatile *_Value);
-__int64 _InterlockedDecrement64_rel(__int64 volatile *_Value);
-#endif
-/*----------------------------------------------------------------------------*\
-|* Interlocked And
-\*----------------------------------------------------------------------------*/
-#if defined(__arm__) || defined(__aarch64__)
-char _InterlockedAnd8_acq(char volatile *_Value, char _Mask);
-char _InterlockedAnd8_nf(char volatile *_Value, char _Mask);
-char _InterlockedAnd8_rel(char volatile *_Value, char _Mask);
-short _InterlockedAnd16_acq(short volatile *_Value, short _Mask);
-short _InterlockedAnd16_nf(short volatile *_Value, short _Mask);
-short _InterlockedAnd16_rel(short volatile *_Value, short _Mask);
-long _InterlockedAnd_acq(long volatile *_Value, long _Mask);
-long _InterlockedAnd_nf(long volatile *_Value, long _Mask);
-long _InterlockedAnd_rel(long volatile *_Value, long _Mask);
-__int64 _InterlockedAnd64_acq(__int64 volatile *_Value, __int64 _Mask);
-__int64 _InterlockedAnd64_nf(__int64 volatile *_Value, __int64 _Mask);
-__int64 _InterlockedAnd64_rel(__int64 volatile *_Value, __int64 _Mask);
-#endif
-/*----------------------------------------------------------------------------*\
-|* Bit Counting and Testing
-\*----------------------------------------------------------------------------*/
-#if defined(__arm__) || defined(__aarch64__)
-unsigned char _interlockedbittestandset_acq(long volatile *_BitBase,
-                                            long _BitPos);
-unsigned char _interlockedbittestandset_nf(long volatile *_BitBase,
-                                           long _BitPos);
-unsigned char _interlockedbittestandset_rel(long volatile *_BitBase,
-                                            long _BitPos);
-unsigned char _interlockedbittestandreset_acq(long volatile *_BitBase,
-                                              long _BitPos);
-unsigned char _interlockedbittestandreset_nf(long volatile *_BitBase,
-                                             long _BitPos);
-unsigned char _interlockedbittestandreset_rel(long volatile *_BitBase,
-                                              long _BitPos);
-#endif
-/*----------------------------------------------------------------------------*\
-|* Interlocked Or
-\*----------------------------------------------------------------------------*/
-#if defined(__arm__) || defined(__aarch64__)
-char _InterlockedOr8_acq(char volatile *_Value, char _Mask);
-char _InterlockedOr8_nf(char volatile *_Value, char _Mask);
-char _InterlockedOr8_rel(char volatile *_Value, char _Mask);
-short _InterlockedOr16_acq(short volatile *_Value, short _Mask);
-short _InterlockedOr16_nf(short volatile *_Value, short _Mask);
-short _InterlockedOr16_rel(short volatile *_Value, short _Mask);
-long _InterlockedOr_acq(long volatile *_Value, long _Mask);
-long _InterlockedOr_nf(long volatile *_Value, long _Mask);
-long _InterlockedOr_rel(long volatile *_Value, long _Mask);
-__int64 _InterlockedOr64_acq(__int64 volatile *_Value, __int64 _Mask);
-__int64 _InterlockedOr64_nf(__int64 volatile *_Value, __int64 _Mask);
-__int64 _InterlockedOr64_rel(__int64 volatile *_Value, __int64 _Mask);
-#endif
-/*----------------------------------------------------------------------------*\
-|* Interlocked Xor
-\*----------------------------------------------------------------------------*/
-#if defined(__arm__) || defined(__aarch64__)
-char _InterlockedXor8_acq(char volatile *_Value, char _Mask);
-char _InterlockedXor8_nf(char volatile *_Value, char _Mask);
-char _InterlockedXor8_rel(char volatile *_Value, char _Mask);
-short _InterlockedXor16_acq(short volatile *_Value, short _Mask);
-short _InterlockedXor16_nf(short volatile *_Value, short _Mask);
-short _InterlockedXor16_rel(short volatile *_Value, short _Mask);
-long _InterlockedXor_acq(long volatile *_Value, long _Mask);
-long _InterlockedXor_nf(long volatile *_Value, long _Mask);
-long _InterlockedXor_rel(long volatile *_Value, long _Mask);
-__int64 _InterlockedXor64_acq(__int64 volatile *_Value, __int64 _Mask);
-__int64 _InterlockedXor64_nf(__int64 volatile *_Value, __int64 _Mask);
-__int64 _InterlockedXor64_rel(__int64 volatile *_Value, __int64 _Mask);
-#endif
-/*----------------------------------------------------------------------------*\
-|* Interlocked Exchange
-\*----------------------------------------------------------------------------*/
-#if defined(__arm__) || defined(__aarch64__)
-char _InterlockedExchange8_acq(char volatile *_Target, char _Value);
-char _InterlockedExchange8_nf(char volatile *_Target, char _Value);
-char _InterlockedExchange8_rel(char volatile *_Target, char _Value);
-short _InterlockedExchange16_acq(short volatile *_Target, short _Value);
-short _InterlockedExchange16_nf(short volatile *_Target, short _Value);
-short _InterlockedExchange16_rel(short volatile *_Target, short _Value);
-long _InterlockedExchange_acq(long volatile *_Target, long _Value);
-long _InterlockedExchange_nf(long volatile *_Target, long _Value);
-long _InterlockedExchange_rel(long volatile *_Target, long _Value);
-__int64 _InterlockedExchange64_acq(__int64 volatile *_Target, __int64 _Value);
-__int64 _InterlockedExchange64_nf(__int64 volatile *_Target, __int64 _Value);
-__int64 _InterlockedExchange64_rel(__int64 volatile *_Target, __int64 _Value);
-#endif
-/*----------------------------------------------------------------------------*\
-|* Interlocked Compare Exchange
-\*----------------------------------------------------------------------------*/
-#if defined(__arm__) || defined(__aarch64__)
-char _InterlockedCompareExchange8_acq(char volatile *_Destination,
-                             char _Exchange, char _Comparand);
-char _InterlockedCompareExchange8_nf(char volatile *_Destination,
-                             char _Exchange, char _Comparand);
-char _InterlockedCompareExchange8_rel(char volatile *_Destination,
-                             char _Exchange, char _Comparand);
-short _InterlockedCompareExchange16_acq(short volatile *_Destination,
-                              short _Exchange, short _Comparand);
-short _InterlockedCompareExchange16_nf(short volatile *_Destination,
-                              short _Exchange, short _Comparand);
-short _InterlockedCompareExchange16_rel(short volatile *_Destination,
-                              short _Exchange, short _Comparand);
-long _InterlockedCompareExchange_acq(long volatile *_Destination,
-                              long _Exchange, long _Comparand);
-long _InterlockedCompareExchange_nf(long volatile *_Destination,
-                              long _Exchange, long _Comparand);
-long _InterlockedCompareExchange_rel(long volatile *_Destination,
-                              long _Exchange, long _Comparand);
-__int64 _InterlockedCompareExchange64_acq(__int64 volatile *_Destination,
-                              __int64 _Exchange, __int64 _Comparand);
-__int64 _InterlockedCompareExchange64_nf(__int64 volatile *_Destination,
-                              __int64 _Exchange, __int64 _Comparand);
-__int64 _InterlockedCompareExchange64_rel(__int64 volatile *_Destination,
-                              __int64 _Exchange, __int64 _Comparand);
-#endif
-
-/*----------------------------------------------------------------------------*\
-|* movs, stos
-\*----------------------------------------------------------------------------*/
-#if defined(__i386__) || defined(__x86_64__)
-static __inline__ void __DEFAULT_FN_ATTRS
-__movsb(unsigned char *__dst, unsigned char const *__src, size_t __n) {
-  __asm__ __volatile__("rep movsb" : "+D"(__dst), "+S"(__src), "+c"(__n)
-                       : : "memory");
-}
-static __inline__ void __DEFAULT_FN_ATTRS
-__movsd(unsigned long *__dst, unsigned long const *__src, size_t __n) {
-  __asm__ __volatile__("rep movsl" : "+D"(__dst), "+S"(__src), "+c"(__n)
-                       : : "memory");
-}
-static __inline__ void __DEFAULT_FN_ATTRS
-__movsw(unsigned short *__dst, unsigned short const *__src, size_t __n) {
-  __asm__ __volatile__("rep movsw" : "+D"(__dst), "+S"(__src), "+c"(__n)
-                       : : "memory");
-}
-static __inline__ void __DEFAULT_FN_ATTRS
-__stosd(unsigned long *__dst, unsigned long __x, size_t __n) {
-  __asm__ __volatile__("rep stosl" : "+D"(__dst), "+c"(__n) : "a"(__x)
-                       : "memory");
-}
-static __inline__ void __DEFAULT_FN_ATTRS
-__stosw(unsigned short *__dst, unsigned short __x, size_t __n) {
-  __asm__ __volatile__("rep stosw" : "+D"(__dst), "+c"(__n) : "a"(__x)
-                       : "memory");
-}
-#endif
-#ifdef __x86_64__
-static __inline__ void __DEFAULT_FN_ATTRS
-__movsq(unsigned long long *__dst, unsigned long long const *__src, size_t __n) {
-  __asm__ __volatile__("rep movsq" : "+D"(__dst), "+S"(__src), "+c"(__n)
-                       : : "memory");
-}
-static __inline__ void __DEFAULT_FN_ATTRS
-__stosq(unsigned __int64 *__dst, unsigned __int64 __x, size_t __n) {
-  __asm__ __volatile__("rep stosq" : "+D"(__dst), "+c"(__n) : "a"(__x)
-                       : "memory");
-}
-#endif
-
-/*----------------------------------------------------------------------------*\
-|* Misc
-\*----------------------------------------------------------------------------*/
-#if defined(__i386__) || defined(__x86_64__)
-static __inline__ void __DEFAULT_FN_ATTRS
-__cpuid(int __info[4], int __level) {
-  __asm__ ("cpuid" : "=a"(__info[0]), "=b" (__info[1]), "=c"(__info[2]), "=d"(__info[3])
-                   : "a"(__level), "c"(0));
-}
-static __inline__ void __DEFAULT_FN_ATTRS
-__cpuidex(int __info[4], int __level, int __ecx) {
-  __asm__ ("cpuid" : "=a"(__info[0]), "=b" (__info[1]), "=c"(__info[2]), "=d"(__info[3])
-                   : "a"(__level), "c"(__ecx));
-}
-static __inline__ void __DEFAULT_FN_ATTRS
-__halt(void) {
-  __asm__ volatile ("hlt");
-}
-#endif
-
-#if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__)
-static __inline__ void __DEFAULT_FN_ATTRS
-__nop(void) {
-  __asm__ volatile ("nop");
-}
-#endif
-
-/*----------------------------------------------------------------------------*\
-|* MS AArch64 specific
-\*----------------------------------------------------------------------------*/
-#if defined(__aarch64__)
-unsigned __int64 __getReg(int);
-long _InterlockedAdd(long volatile *Addend, long Value);
-__int64 _ReadStatusReg(int);
-void _WriteStatusReg(int, __int64);
-
-unsigned short __cdecl _byteswap_ushort(unsigned short val);
-unsigned long __cdecl _byteswap_ulong (unsigned long val);
-unsigned __int64 __cdecl _byteswap_uint64(unsigned __int64 val);
-#endif
-
-/*----------------------------------------------------------------------------*\
-|* Privileged intrinsics
-\*----------------------------------------------------------------------------*/
-#if defined(__i386__) || defined(__x86_64__)
-static __inline__ unsigned __int64 __DEFAULT_FN_ATTRS
-__readmsr(unsigned long __register) {
-  // Loads the contents of a 64-bit model specific register (MSR) specified in
-  // the ECX register into registers EDX:EAX. The EDX register is loaded with
-  // the high-order 32 bits of the MSR and the EAX register is loaded with the
-  // low-order 32 bits. If less than 64 bits are implemented in the MSR being
-  // read, the values returned to EDX:EAX in unimplemented bit locations are
-  // undefined.
-  unsigned long __edx;
-  unsigned long __eax;
-  __asm__ ("rdmsr" : "=d"(__edx), "=a"(__eax) : "c"(__register));
-  return (((unsigned __int64)__edx) << 32) | (unsigned __int64)__eax;
-}
-#endif
-
-static __inline__ unsigned __LPTRINT_TYPE__ __DEFAULT_FN_ATTRS
-__readcr3(void) {
-  unsigned __LPTRINT_TYPE__ __cr3_val;
-  __asm__ __volatile__ ("mov %%cr3, %0" : "=r"(__cr3_val) : : "memory");
-  return __cr3_val;
-}
-
-static __inline__ void __DEFAULT_FN_ATTRS
-__writecr3(unsigned __INTPTR_TYPE__ __cr3_val) {
-  __asm__ ("mov %0, %%cr3" : : "r"(__cr3_val) : "memory");
-}
-
 #ifdef __cplusplus
 }
 #endif
+#endif
 
-#undef __LPTRINT_TYPE__
-
-#undef __DEFAULT_FN_ATTRS
-
-#endif /* __INTRIN_H */
 #endif /* _MSC_VER */
+#endif /* __CLANG_INTRIN_H */

clang/lib/Headers/intrin0.h

-/* ===-------- intrin.h ---------------------------------------------------===
+/* ===-------- intrin0.h --------------------------------------------------===
  *
  * 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 __CLANG_INTRIN0_H
+#define __CLANG_INTRIN0_H
+
 /* Only include this if we're compiling for the windows platform. */
 #ifndef _MSC_VER
-#include_next <intrin.h>
+#include_next <intrin0.h>
 #else
 
-#ifndef __INTRIN_H
-#define __INTRIN_H
-
-/* First include the standard intrinsics. */
+/* _tzcnt_u32 and _tzcnt_u64 are provided by <intrin0.h>. */
 #if defined(__i386__) || defined(__x86_64__)
-#include <x86intrin.h>
-#endif
-
-#if defined(__arm__)
-#include <armintr.h>
-#endif
-
-#if defined(__aarch64__)
-#include <arm64intr.h>
-#endif
-
-/* For the definition of jmp_buf. */
-#if __STDC_HOSTED__
-#include <setjmp.h>
+#include <bmiintrin.h>
 #endif
 
 /* Define the default attributes for the functions in this file. */
 #define __DEFAULT_FN_ATTRS __attribute__((__always_inline__, __nodebug__))
 
 #if __x86_64__
 #define __LPTRINT_TYPE__ __int64
 #else
 #define __LPTRINT_TYPE__ long
 #endif
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-#if defined(__MMX__)
-/* And the random ones that aren't in those files. */
-__m64 _m_from_float(float);
-float _m_to_float(__m64);
-#endif
-
 /* Other assorted instruction intrinsics. */
+/* FIXME: We could cut this down substantially by checking which of
+ * these MSVC actually provides in its <intrin0.h>.
+ */
 void __addfsbyte(unsigned long, unsigned char);
 void __addfsdword(unsigned long, unsigned long);
 void __addfsword(unsigned long, unsigned short);
 void __code_seg(const char *);
 static __inline__
 void __cpuid(int[4], int);
 static __inline__
 void __cpuidex(int[4], int, int);
 static __inline__
 __int64 __emul(int, int);
 static __inline__
 unsigned __int64 __emulu(unsigned int, unsigned int);
 unsigned int __getcallerseflags(void);
 static __inline__
 void __halt(void);
 unsigned char __inbyte(unsigned short);
 void __inbytestring(unsigned short, unsigned char *, unsigned long);
 void __incfsbyte(unsigned long);
 void __incfsdword(unsigned long);
 void __incfsword(unsigned long);
 unsigned long __indword(unsigned short);
 void __indwordstring(unsigned short, unsigned long *, unsigned long);
 void __int2c(void);
 void __invlpg(void *);
 unsigned short __inword(unsigned short);
 void __inwordstring(unsigned short, unsigned short *, unsigned long);
 void __lidt(void *);
 unsigned __int64 __ll_lshift(unsigned __int64, int);
 __int64 __ll_rshift(__int64, int);
 static __inline__
 void __movsb(unsigned char *, unsigned char const *, size_t);
 static __inline__
 void __movsd(unsigned long *, unsigned long const *, size_t);
 static __inline__
 void __movsw(unsigned short *, unsigned short const *, size_t);
 static __inline__
 void __nop(void);
 void __nvreg_restore_fence(void);
 void __nvreg_save_fence(void);
 void __outbyte(unsigned short, unsigned char);
 void __outbytestring(unsigned short, unsigned char *, unsigned long);
 void __outdword(unsigned short, unsigned long);
 void __outdwordstring(unsigned short, unsigned long *, unsigned long);
 void __outword(unsigned short, unsigned short);
 void __outwordstring(unsigned short, unsigned short *, unsigned long);
 unsigned long __readcr0(void);
 unsigned long __readcr2(void);
 unsigned __LPTRINT_TYPE__ __readcr3(void);
 unsigned long __readcr4(void);
 unsigned long __readcr8(void);
 unsigned int __readdr(unsigned int);
 #ifdef __i386__
 static __inline__
 unsigned char __readfsbyte(unsigned long);
 static __inline__
 unsigned __int64 __readfsqword(unsigned long);
 static __inline__
 unsigned short __readfsword(unsigned long);
 #endif
 static __inline__
 unsigned __int64 __readmsr(unsigned long);
 unsigned __int64 __readpmc(unsigned long);
 unsigned long __segmentlimit(unsigned long);
 void __sidt(void *);
 static __inline__
 void __stosb(unsigned char *, unsigned char, size_t);
 static __inline__
 void __stosd(unsigned long *, unsigned long, size_t);
 static __inline__
 void __stosw(unsigned short *, unsigned short, size_t);
 void __svm_clgi(void);
 void __svm_invlpga(void *, int);
 void __svm_skinit(int);
 void __svm_stgi(void);
 void __svm_vmload(size_t);
 void __svm_vmrun(size_t);
 void __svm_vmsave(size_t);
 void __ud2(void);
 unsigned __int64 __ull_rshift(unsigned __int64, int);
 void __vmx_off(void);
 void __vmx_vmptrst(unsigned __int64 *);
 void __wbinvd(void);
 void __writecr0(unsigned int);
 static __inline__
 void __writecr3(unsigned __INTPTR_TYPE__);
 void __writecr4(unsigned int);
 void __writecr8(unsigned int);
 void __writedr(unsigned int, unsigned int);
 void __writefsbyte(unsigned long, unsigned char);
 void __writefsdword(unsigned long, unsigned long);
 void __writefsqword(unsigned long, unsigned __int64);
 void __writefsword(unsigned long, unsigned short);
 void __writemsr(unsigned long, unsigned __int64);
 static __inline__
 void *_AddressOfReturnAddress(void);
 static __inline__
 unsigned char _BitScanForward(unsigned long *_Index, unsigned long _Mask);
 static __inline__
 unsigned char _BitScanReverse(unsigned long *_Index, unsigned long _Mask);
 unsigned char _bittest(long const *, long);
 unsigned char _bittestandcomplement(long *, long);
 unsigned char _bittestandreset(long *, long);
 unsigned char _bittestandset(long *, long);
 void __cdecl _disable(void);
 void __cdecl _enable(void);
 long _InterlockedAddLargeStatistic(__int64 volatile *_Addend, long _Value);
 unsigned char _interlockedbittestandreset(long volatile *, long);
 unsigned char _interlockedbittestandset(long volatile *, long);
 void *_InterlockedCompareExchangePointer_HLEAcquire(void *volatile *, void *,
                                                     void *);
 void *_InterlockedCompareExchangePointer_HLERelease(void *volatile *, void *,
                                                     void *);
 long _InterlockedExchangeAdd_HLEAcquire(long volatile *, long);
 long _InterlockedExchangeAdd_HLERelease(long volatile *, long);
 __int64 _InterlockedExchangeAdd64_HLEAcquire(__int64 volatile *, __int64);
 __int64 _InterlockedExchangeAdd64_HLERelease(__int64 volatile *, __int64);
 static __inline__ void
 __attribute__((__deprecated__("use other intrinsics or C++11 atomics instead")))
 _ReadBarrier(void);
 static __inline__ void
 __attribute__((__deprecated__("use other intrinsics or C++11 atomics instead")))
 _ReadWriteBarrier(void);
 unsigned int _rorx_u32(unsigned int, const unsigned int);
 int _sarx_i32(int, unsigned int);
 #if __STDC_HOSTED__
 int __cdecl _setjmp(jmp_buf);
 #endif
 unsigned int _shlx_u32(unsigned int, unsigned int);
 unsigned int _shrx_u32(unsigned int, unsigned int);
 void _Store_HLERelease(long volatile *, long);
 void _Store64_HLERelease(__int64 volatile *, __int64);
 void _StorePointer_HLERelease(void *volatile *, void *);
 static __inline__ void
 __attribute__((__deprecated__("use other intrinsics or C++11 atomics instead")))
 _WriteBarrier(void);
 unsigned __int32 xbegin(void);
 void _xend(void);
 
 /* These additional intrinsics are turned on in x64/amd64/x86_64 mode. */
 #ifdef __x86_64__
 void __addgsbyte(unsigned long, unsigned char);
 void __addgsdword(unsigned long, unsigned long);
 void __addgsqword(unsigned long, unsigned __int64);
 void __addgsword(unsigned long, unsigned short);
 static __inline__
 void __faststorefence(void);
 void __incgsbyte(unsigned long);
 void __incgsdword(unsigned long);
 void __incgsqword(unsigned long);
 void __incgsword(unsigned long);
 static __inline__
 void __movsq(unsigned long long *, unsigned long long const *, size_t);
 static __inline__
 unsigned char __readgsbyte(unsigned long);
 static __inline__
 unsigned long __readgsdword(unsigned long);
 static __inline__
 unsigned __int64 __readgsqword(unsigned long);
 unsigned short __readgsword(unsigned long);
 unsigned __int64 __shiftleft128(unsigned __int64 _LowPart,
                                 unsigned __int64 _HighPart,
                                 unsigned char _Shift);
 unsigned __int64 __shiftright128(unsigned __int64 _LowPart,
                                  unsigned __int64 _HighPart,
                                  unsigned char _Shift);
 static __inline__
 void __stosq(unsigned __int64 *, unsigned __int64, size_t);
 unsigned char __vmx_on(unsigned __int64 *);
 unsigned char __vmx_vmclear(unsigned __int64 *);
 unsigned char __vmx_vmlaunch(void);
 unsigned char __vmx_vmptrld(unsigned __int64 *);
 unsigned char __vmx_vmread(size_t, size_t *);
 unsigned char __vmx_vmresume(void);
 unsigned char __vmx_vmwrite(size_t, size_t);

 long _InterlockedXor_np(long volatile *_Value, long _Mask);
 short _InterlockedXor16_np(short volatile *_Value, short _Mask);
 __int64 _InterlockedXor64_np(__int64 volatile *_Value, __int64 _Mask);
 char _InterlockedXor8_np(char volatile *_Value, char _Mask);
 unsigned __int64 _rorx_u64(unsigned __int64, const unsigned int);
 __int64 _sarx_i64(__int64, unsigned int);
 unsigned __int64 _shlx_u64(unsigned __int64, unsigned int);
 unsigned __int64 _shrx_u64(unsigned __int64, unsigned int);
 static __inline__
 __int64 __mulh(__int64, __int64);
 static __inline__
 unsigned __int64 __umulh(unsigned __int64, unsigned __int64);
 static __inline__
 __int64 _mul128(__int64, __int64, __int64*);
 static __inline__
 unsigned __int64 _umul128(unsigned __int64,
                           unsigned __int64,
                           unsigned __int64*);
 
 #endif /* __x86_64__ */
 
 #if defined(__x86_64__) || defined(__arm__) || defined(__aarch64__)
 
 static __inline__
 unsigned char _BitScanForward64(unsigned long *_Index, unsigned __int64 _Mask);
 static __inline__
 unsigned char _BitScanReverse64(unsigned long *_Index, unsigned __int64 _Mask);
 
 #endif
 
 #if defined(__i386__) || defined(__x86_64__) || defined(__arm__) || defined(__aarch64__)
 static __inline__
 __int64 _InterlockedDecrement64(__int64 volatile *_Addend);
 static __inline__
 __int64 _InterlockedExchange64(__int64 volatile *_Target, __int64 _Value);
 static __inline__
 __int64 _InterlockedExchangeAdd64(__int64 volatile *_Addend, __int64 _Value);
 static __inline__
 __int64 _InterlockedExchangeSub64(__int64 volatile *_Subend, __int64 _Value);

 char _InterlockedExchangeAdd8_nf(char volatile *_Addend, char _Value);
 char _InterlockedExchangeAdd8_rel(char volatile *_Addend, char _Value);
 short _InterlockedExchangeAdd16_acq(short volatile *_Addend, short _Value);
 short _InterlockedExchangeAdd16_nf(short volatile *_Addend, short _Value);
 short _InterlockedExchangeAdd16_rel(short volatile *_Addend, short _Value);
 long _InterlockedExchangeAdd_acq(long volatile *_Addend, long _Value);
 long _InterlockedExchangeAdd_nf(long volatile *_Addend, long _Value);
 long _InterlockedExchangeAdd_rel(long volatile *_Addend, long _Value);
 __int64 _InterlockedExchangeAdd64_acq(__int64 volatile *_Addend, __int64 _Value);
 __int64 _InterlockedExchangeAdd64_nf(__int64 volatile *_Addend, __int64 _Value);
 __int64 _InterlockedExchangeAdd64_rel(__int64 volatile *_Addend, __int64 _Value);
 #endif
 /*----------------------------------------------------------------------------*\
 |* Interlocked Increment
 \*----------------------------------------------------------------------------*/
 #if defined(__arm__) || defined(__aarch64__)
 short _InterlockedIncrement16_acq(short volatile *_Value);
 short _InterlockedIncrement16_nf(short volatile *_Value);
 short _InterlockedIncrement16_rel(short volatile *_Value);

 __int64 _InterlockedExchange64_nf(__int64 volatile *_Target, __int64 _Value);
 __int64 _InterlockedExchange64_rel(__int64 volatile *_Target, __int64 _Value);
 #endif
 /*----------------------------------------------------------------------------*\
 |* Interlocked Compare Exchange
 \*----------------------------------------------------------------------------*/
 #if defined(__arm__) || defined(__aarch64__)
 char _InterlockedCompareExchange8_acq(char volatile *_Destination,
                              char _Exchange, char _Comparand);
 char _InterlockedCompareExchange8_nf(char volatile *_Destination,
                              char _Exchange, char _Comparand);
 char _InterlockedCompareExchange8_rel(char volatile *_Destination,
                              char _Exchange, char _Comparand);
 short _InterlockedCompareExchange16_acq(short volatile *_Destination,
                               short _Exchange, short _Comparand);
 short _InterlockedCompareExchange16_nf(short volatile *_Destination,
                               short _Exchange, short _Comparand);
 short _InterlockedCompareExchange16_rel(short volatile *_Destination,
                               short _Exchange, short _Comparand);
 long _InterlockedCompareExchange_acq(long volatile *_Destination,
                               long _Exchange, long _Comparand);
 long _InterlockedCompareExchange_nf(long volatile *_Destination,
                               long _Exchange, long _Comparand);
 long _InterlockedCompareExchange_rel(long volatile *_Destination,
                               long _Exchange, long _Comparand);
 __int64 _InterlockedCompareExchange64_acq(__int64 volatile *_Destination,
                               __int64 _Exchange, __int64 _Comparand);
 __int64 _InterlockedCompareExchange64_nf(__int64 volatile *_Destination,
                               __int64 _Exchange, __int64 _Comparand);
 __int64 _InterlockedCompareExchange64_rel(__int64 volatile *_Destination,
                               __int64 _Exchange, __int64 _Comparand);
 #endif
 
 /*----------------------------------------------------------------------------*\
 |* movs, stos
 \*----------------------------------------------------------------------------*/
 #if defined(__i386__) || defined(__x86_64__)
 static __inline__ void __DEFAULT_FN_ATTRS
 __movsb(unsigned char *__dst, unsigned char const *__src, size_t __n) {
   __asm__ __volatile__("rep movsb" : "+D"(__dst), "+S"(__src), "+c"(__n)
                        : : "memory");
 }
 static __inline__ void __DEFAULT_FN_ATTRS
 __movsd(unsigned long *__dst, unsigned long const *__src, size_t __n) {
   __asm__ __volatile__("rep movsl" : "+D"(__dst), "+S"(__src), "+c"(__n)
                        : : "memory");
 }
 static __inline__ void __DEFAULT_FN_ATTRS
 __movsw(unsigned short *__dst, unsigned short const *__src, size_t __n) {
   __asm__ __volatile__("rep movsw" : "+D"(__dst), "+S"(__src), "+c"(__n)
                        : : "memory");
 }
 static __inline__ void __DEFAULT_FN_ATTRS
 __stosd(unsigned long *__dst, unsigned long __x, size_t __n) {
   __asm__ __volatile__("rep stosl" : "+D"(__dst), "+c"(__n) : "a"(__x)
                        : "memory");
 }
 static __inline__ void __DEFAULT_FN_ATTRS
 __stosw(unsigned short *__dst, unsigned short __x, size_t __n) {
   __asm__ __volatile__("rep stosw" : "+D"(__dst), "+c"(__n) : "a"(__x)
                        : "memory");
 }
 #endif
 #ifdef __x86_64__
 static __inline__ void __DEFAULT_FN_ATTRS
 __movsq(unsigned long long *__dst, unsigned long long const *__src, size_t __n) {
   __asm__ __volatile__("rep movsq" : "+D"(__dst), "+S"(__src), "+c"(__n)
                        : : "memory");
 }
 static __inline__ void __DEFAULT_FN_ATTRS
 __stosq(unsigned __int64 *__dst, unsigned __int64 __x, size_t __n) {
   __asm__ __volatile__("rep stosq" : "+D"(__dst), "+c"(__n) : "a"(__x)
                        : "memory");
 }
 #endif
 
 /*----------------------------------------------------------------------------*\
 |* Misc
 \*----------------------------------------------------------------------------*/
 #if defined(__i386__) || defined(__x86_64__)
 static __inline__ void __DEFAULT_FN_ATTRS
 __cpuid(int __info[4], int __level) {
   __asm__ ("cpuid" : "=a"(__info[0]), "=b" (__info[1]), "=c"(__info[2]), "=d"(__info[3])
                    : "a"(__level), "c"(0));
 }
 static __inline__ void __DEFAULT_FN_ATTRS
 __cpuidex(int __info[4], int __level, int __ecx) {
   __asm__ ("cpuid" : "=a"(__info[0]), "=b" (__info[1]), "=c"(__info[2]), "=d"(__info[3])
                    : "a"(__level), "c"(__ecx));
 }
 static __inline__ void __DEFAULT_FN_ATTRS
 __halt(void) {
   __asm__ volatile ("hlt");
 }
 #endif
 
 #if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__)
 static __inline__ void __DEFAULT_FN_ATTRS
 __nop(void) {
   __asm__ volatile ("nop");
 }
 #endif
 
 /*----------------------------------------------------------------------------*\
 |* MS AArch64 specific
 \*----------------------------------------------------------------------------*/
 #if defined(__aarch64__)
 unsigned __int64 __getReg(int);
 long _InterlockedAdd(long volatile *Addend, long Value);
 __int64 _ReadStatusReg(int);
 void _WriteStatusReg(int, __int64);
 
 unsigned short __cdecl _byteswap_ushort(unsigned short val);
 unsigned long __cdecl _byteswap_ulong (unsigned long val);
 unsigned __int64 __cdecl _byteswap_uint64(unsigned __int64 val);
 #endif
 
 /*----------------------------------------------------------------------------*\
 |* Privileged intrinsics
 \*----------------------------------------------------------------------------*/
 #if defined(__i386__) || defined(__x86_64__)
 static __inline__ unsigned __int64 __DEFAULT_FN_ATTRS
 __readmsr(unsigned long __register) {
   // Loads the contents of a 64-bit model specific register (MSR) specified in
   // the ECX register into registers EDX:EAX. The EDX register is loaded with
   // the high-order 32 bits of the MSR and the EAX register is loaded with the
   // low-order 32 bits. If less than 64 bits are implemented in the MSR being
   // read, the values returned to EDX:EAX in unimplemented bit locations are
   // undefined.
   unsigned long __edx;
   unsigned long __eax;
   __asm__ ("rdmsr" : "=d"(__edx), "=a"(__eax) : "c"(__register));
   return (((unsigned __int64)__edx) << 32) | (unsigned __int64)__eax;
 }
 #endif
 
 static __inline__ unsigned __LPTRINT_TYPE__ __DEFAULT_FN_ATTRS
 __readcr3(void) {
   unsigned __LPTRINT_TYPE__ __cr3_val;
   __asm__ __volatile__ ("mov %%cr3, %0" : "=r"(__cr3_val) : : "memory");
   return __cr3_val;
 }
 
 static __inline__ void __DEFAULT_FN_ATTRS
 __writecr3(unsigned __INTPTR_TYPE__ __cr3_val) {
   __asm__ ("mov %0, %%cr3" : : "r"(__cr3_val) : "memory");
 }
 
 #ifdef __cplusplus
 }
 #endif
 
 #undef __LPTRINT_TYPE__
 
 #undef __DEFAULT_FN_ATTRS
 
-#endif /* __INTRIN_H */
 #endif /* _MSC_VER */
+#endif /* __CLANG_INTRIN0_H */

clang/test/Headers/ms-intrin0.cpp

+// RUN: %clang_cc1 -triple x86_64-pc-win32  \
+// RUN:     -fms-extensions -fms-compatibility -fms-compatibility-version=17.00 \
+// RUN:     -ffreestanding -emit-obj -o /dev/null -Werror \
+// RUN:     -isystem %S/Inputs/include %s
+
+// RUN: %clang_cc1 -triple i386-pc-win32 \
+// RUN:     -fms-extensions -fms-compatibility -fms-compatibility-version=17.00 \
+// RUN:     -ffreestanding -emit-obj -o /dev/null -Werror \
+// RUN:     -isystem %S/Inputs/include %s
+
+// RUN: %clang_cc1 -triple thumbv7--windows \
+// RUN:     -fms-compatibility -fms-compatibility-version=17.00 \
+// RUN:     -ffreestanding -fsyntax-only -Werror \
+// RUN:     -isystem %S/Inputs/include %s
+
+// REQUIRES: x86-registered-target
+
+#include <intrin0.h>
+
+// Use some C++ to make sure we closed the extern "C" brackets.
+template <typename T>
+void foo(T V) {}
+
+void f(long *lp, unsigned long *ulp) {
+  _BitScanForward(ulp, 123L);
+  _bittest(lp, 3);
+  _InterlockedExchange(lp, 123L);
+  _InterlockedIncrement(lp);
+  const volatile __int64 x = 0;
+  __iso_volatile_load64(&x);
+
+#if defined _M_IX86 || defined _M_X64
+  _tzcnt_u32(123);
+#endif
+
+#ifdef _M_ARM
+  __yield();
+  __dmb(123);
+#endif
+}