ARM64 intrinsics

The Microsoft C++ compiler (MSVC) makes the following intrinsics available on the ARM64 architecture. For more information about ARM, see the Architecture and Software Development Tools sections of the ARM Developer Documentation website.

NEON

The NEON vector instruction set extensions for ARM64 provide Single Instruction Multiple Data (SIMD) capabilities. They resemble the ones in the MMX and SSE vector instruction sets that are common to x86 and x64 architecture processors.

NEON intrinsics are supported, as provided in the header file arm64_neon.h. The MSVC support for NEON intrinsics resembles that of the ARM64 compiler, which is documented in the ARM NEON Intrinsic Reference on the ARM Infocenter website.

ARM64-specific intrinsics listing

ARM64-specific intrinsics are supported, as provided in the header file intrin.h.

Function Name Instruction Function Prototype
__break BRK void __break(int)
__addx18byte void __addx18byte(unsigned long, unsigned char)
__addx18word void __addx18word(unsigned long, unsigned short)
__addx18dword void __addx18dword(unsigned long, unsigned long)
__addx18qword void __addx18qword(unsigned long, unsigned __int64)
__cas8 CASB unsigned __int8 __cas8(unsigned __int8 volatile* _Target, unsigned __int8 _Comp, unsigned __int8 _Value)
__cas16 CASH unsigned __int16 __cas16(unsigned __int16 volatile* _Target, unsigned __int16 _Comp, unsigned __int16 _Value)
__cas32 CAS unsigned __int32 __cas32(unsigned __int32 volatile* _Target, unsigned __int32 _Comp, unsigned __int32 _Value)
__cas64 CAS unsigned __int64 __cas64(unsigned __int64 volatile* _Target, unsigned __int64 _Comp, unsigned __int64 _Value)
__casa8 CASAB unsigned __int8 __casa8(unsigned __int8 volatile* _Target, unsigned __int8 _Comp, unsigned __int8 _Value)
__casa16 CASAH unsigned __int16 __casa16(unsigned __int16 volatile* _Target, unsigned __int16 _Comp, unsigned __int16 _Value)
__casa32 CASA unsigned __int32 __casa32(unsigned __int32 volatile* _Target, unsigned __int32 _Comp, unsigned __int32 _Value)
__casa64 CASA unsigned __int64 __casa64(unsigned __int64 volatile* _Target, unsigned __int64 _Comp, unsigned __int64 _Value)
__casl8 CASLB unsigned __int8 __casl8(unsigned __int8 volatile* _Target, unsigned __int8 _Comp, unsigned __int8 _Value)
__casl16 CASLH unsigned __int16 __casl16(unsigned __int16 volatile* _Target, unsigned __int16 _Comp, unsigned __int16 _Value)
__casl32 CASL unsigned __int32 __casl32(unsigned __int32 volatile* _Target, unsigned __int32 _Comp, unsigned __int32 _Value)
__casl64 CASL unsigned __int64 __casl64(unsigned __int64 volatile* _Target, unsigned __int64 _Comp, unsigned __int64 _Value)
__casal8 CASALB unsigned __int8 __casal8(unsigned __int8 volatile* _Target, unsigned __int8 _Comp, unsigned __int8 _Value)
__casal16 CASALH unsigned __int16 __casal16(unsigned __int16 volatile* _Target, unsigned __int16 _Comp, unsigned __int16 _Value)
__casal32 CASAL unsigned __int32 __casal32(unsigned __int32 volatile* _Target, unsigned __int32 _Comp, unsigned __int32 _Value)
__casal64 CASAL unsigned __int64 __casal64(unsigned __int64 volatile* _Target, unsigned __int64 _Comp, unsigned __int64 _Value)
__crc32b CRC32B unsigned __int32 __crc32b(unsigned __int32, unsigned __int32)
__crc32h CRC32H unsigned __int32 __crc32h(unsigned __int32, unsigned __int32)
__crc32w CRC32W unsigned __int32 __crc32w(unsigned __int32, unsigned __int32)
__crc32d CRC32X unsigned __int32 __crc32d(unsigned __int32, unsigned __int64)
__crc32cb CRC32CB unsigned __int32 __crc32cb(unsigned __int32, unsigned __int32)
__crc32ch CRC32CH unsigned __int32 __crc32ch(unsigned __int32, unsigned __int32)
__crc32cw CRC32CW unsigned __int32 __crc32cw(unsigned __int32, unsigned __int32)
__crc32cd CRC32CX unsigned __int32 __crc32cd(unsigned __int32, unsigned __int64)
__dmb DMB void __dmb(unsigned int _Type)

Inserts a memory barrier operation into the instruction stream. The parameter _Type specifies the kind of restriction that the barrier enforces.

For more information about the kinds of restrictions that can be enforced, see Memory barrier restrictions.
__dsb DSB void __dsb(unsigned int _Type)

Inserts a memory barrier operation into the instruction stream. The parameter _Type specifies the kind of restriction that the barrier enforces.

For more information about the kinds of restrictions that can be enforced, see Memory barrier restrictions.
__isb ISB void __isb(unsigned int _Type)

Inserts a memory barrier operation into the instruction stream. The parameter _Type specifies the kind of restriction that the barrier enforces.

For more information about the kinds of restrictions that can be enforced, see Memory barrier restrictions.
__getReg unsigned __int64 __getReg(int)
__getRegFp double __getRegFp(int)
__getCallerReg unsigned __int64 __getCallerReg(int)
__getCallerRegFp double __getCallerRegFp(int)
__hvc HVC unsigned int __hvc(unsigned int, ...)
__hlt HLT int __hlt(unsigned int, ...)
__incx18byte void __incx18byte(unsigned long)
__incx18word void __incx18word(unsigned long)
__incx18dword void __incx18dword(unsigned long)
__incx18qword void __incx18qword(unsigned long)
__iso_volatile_load16 __int16 __iso_volatile_load16(const volatile __int16 *)

For more information, see __iso_volatile_load/store intrinsics.
__iso_volatile_load32 __int32 __iso_volatile_load32(const volatile __int32 *)

For more information, see __iso_volatile_load/store intrinsics.
__iso_volatile_load64 __int64 __iso_volatile_load64(const volatile __int64 *)

For more information, see __iso_volatile_load/store intrinsics.
__iso_volatile_load8 __int8 __iso_volatile_load8(const volatile __int8 *)

For more information, see __iso_volatile_load/store intrinsics.
__iso_volatile_store16 void __iso_volatile_store16(volatile __int16 *, __int16)

For more information, see __iso_volatile_load/store intrinsics.
__iso_volatile_store32 void __iso_volatile_store32(volatile __int32 *, __int32)

For more information, see __iso_volatile_load/store intrinsics.
__iso_volatile_store64 void __iso_volatile_store64(volatile __int64 *, __int64)

For more information, see __iso_volatile_load/store intrinsics.
__iso_volatile_store8 void __iso_volatile_store8(volatile __int8 *, __int8)

For more information, see __iso_volatile_load/store intrinsics.
__ldar8 LDARB unsigned __int8 __ldar8(unsigned __int8 volatile* _Target)
__ldar16 LDARH unsigned __int16 __ldar16(unsigned __int16 volatile* _Target)
__ldar32 LDAR unsigned __int32 __ldar32(unsigned __int32 volatile* _Target)
__ldar64 LDAR unsigned __int64 __ldar64(unsigned __int64 volatile* _Target)
__ldapr8 LDAPRB unsigned __int8 __ldapr8(unsigned __int8 volatile* _Target)
__ldapr16 LDAPRH unsigned __int16 __ldapr16(unsigned __int16 volatile* _Target)
__ldapr32 LDAPR unsigned __int32 __ldapr32(unsigned __int32 volatile* _Target)
__ldapr64 LDAPR unsigned __int64 __ldapr64(unsigned __int64 volatile* _Target)
__mulh __int64 __mulh(__int64, __int64)
__prefetch PRFM void __cdecl __prefetch(const void *)

Provides a PRFM memory hint with the prefetch operation PLDL1KEEP to the system that memory at or near the specified address may be accessed soon. Some systems may choose to optimize for that memory access pattern to increase runtime performance. However, from the C++ language point of view, the function has no observable effect, and may do nothing at all.
__prefetch2 PRFM void __cdecl __prefetch(const void *, uint8_t prfop)

Provides a PRFM memory hint with the provided prefetch operation to the system that memory at or near the specified address may be accessed soon. Some systems may choose to optimize for that memory access pattern to increase runtime performance. However, from the C++ language point of view, the function has no observable effect, and may do nothing at all.
__readx18byte unsigned char __readx18byte(unsigned long)
__readx18word unsigned short __readx18word(unsigned long)
__readx18dword unsigned long __readx18dword(unsigned long)
__readx18qword unsigned __int64 __readx18qword(unsigned long)
__setReg void __setReg(int, unsigned __int64)
__setRegFp void __setRegFp(int, double)
__setCallerReg void __setCallerReg(int, unsigned __int64)
__setCallerRegFp void __setCallerRegFp(int, double)
__sev SEV void __sev(void)
__static_assert void __static_assert(int, const char *)
__stlr8 STLRB void __stlr8(unsigned __int8 volatile* _Target, unsigned __int8 _Value)
__stlr16 STLRH void __stlr16(unsigned __int16 volatile* _Target, unsigned __int16 _Value)
__stlr32 STLR void __stlr32(unsigned __int32 volatile* _Target, unsigned __int32 _Value)
__stlr64 STLR void __stlr64(unsigned __int64 volatile* _Target, unsigned __int64 _Value)
__swp8 SWPB unsigned __int8 __swp8(unsigned __int8 volatile* _Target, unsigned __int8 _Value)
__swp16 SWPH unsigned __int16 __swp16(unsigned __int16 volatile* _Target, unsigned __int16 _Value)
__swp32 SWP unsigned __int32 __swp32(unsigned __int32 volatile* _Target, unsigned __int32 _Value)
__swp64 SWP unsigned __int64 __swp64(unsigned __int64 volatile* _Target, unsigned __int64 _Value)
__swpa8 SWPAB unsigned __int8 __swpa8(unsigned __int8 volatile* _Target, unsigned __int8 _Value)
__swpa16 SWPAH unsigned __int16 __swpa16(unsigned __int16 volatile* _Target, unsigned __int16 _Value)
__swpa32 SWPA unsigned __int32 __swpa32(unsigned __int32 volatile* _Target, unsigned __int32 _Value)
__swpa64 SWPA unsigned __int64 __swpa64(unsigned __int64 volatile* _Target, unsigned __int64 _Value)
__swpl8 SWPLB unsigned __int8 __swpl8(unsigned __int8 volatile* _Target, unsigned __int8 _Value)
__swpl16 SWPLH unsigned __int16 __swpl16(unsigned __int16 volatile* _Target, unsigned __int16 _Value)
__swpl32 SWPL unsigned __int32 __swpl32(unsigned __int32 volatile* _Target, unsigned __int32 _Value)
__swpl64 SWPL unsigned __int64 __swpl64(unsigned __int64 volatile* _Target, unsigned __int64 _Value)
__swpal8 SWPALB unsigned __int8 __swpal8(unsigned __int8 volatile* _Target, unsigned __int8 _Value)
__swpal16 SWPALH unsigned __int16 __swpal16(unsigned __int16 volatile* _Target, unsigned __int16 _Value)
__swpal32 SWPAL unsigned __int32 __swpal32(unsigned __int32 volatile* _Target, unsigned __int32 _Value)
__swpal64 SWPAL unsigned __int64 __swpal64(unsigned __int64 volatile* _Target, unsigned __int64 _Value)
__sys SYS unsigned int __sys(int, __int64)
__svc SVC unsigned int __svc(unsigned int, ...)
__wfe WFE void __wfe(void)
__wfi WFI void __wfi(void)
__writex18byte void __writex18byte(unsigned long, unsigned char)
__writex18word void __writex18word(unsigned long, unsigned short)
__writex18dword void __writex18dword(unsigned long, unsigned long)
__writex18qword void __writex18qword(unsigned long, unsigned __int64)
__umulh unsigned __int64 __umulh(unsigned __int64, unsigned __int64)
_CopyDoubleFromInt64 double _CopyDoubleFromInt64(__int64)
_CopyFloatFromInt32 float _CopyFloatFromInt32(__int32)
_CopyInt32FromFloat __int32 _CopyInt32FromFloat(float)
_CopyInt64FromDouble __int64 _CopyInt64FromDouble(double)
_CountLeadingOnes unsigned int _CountLeadingOnes(unsigned long)
_CountLeadingOnes64 unsigned int _CountLeadingOnes64(unsigned __int64)
_CountLeadingSigns unsigned int _CountLeadingSigns(long)
_CountLeadingSigns64 unsigned int _CountLeadingSigns64(__int64)
_CountLeadingZeros unsigned int _CountLeadingZeros(unsigned long)
_CountLeadingZeros64 unsigned int _CountLeadingZeros64(unsigned __int64)
_CountTrailingZeros unsigned int _CountTrailingZeros(unsigned long)
_CountTrailingZeros64 unsigned int _CountTrailingZeros64(unsigned __int64)
_CountOneBits unsigned int _CountOneBits(unsigned long)
_CountOneBits64 unsigned int _CountOneBits64(unsigned __int64)
_ReadStatusReg MRS __int64 _ReadStatusReg(int)
_WriteStatusReg MSR void _WriteStatusReg(int, __int64)

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Memory barrier restrictions

The intrinsic functions __dmb (data memory barrier), __dsb (data synchronization barrier), and __isb (instruction synchronization barrier) use the following predefined values to specify the memory barrier restriction in terms of the sharing domain and the kind of access that are affected by the operation.

Restriction Value Description
_ARM64_BARRIER_SY Full system, reads and writes.
_ARM64_BARRIER_ST Full system, writes only.
_ARM64_BARRIER_LD Full system, read only.
_ARM64_BARRIER_ISH Inner sharable, reads and writes.
_ARM64_BARRIER_ISHST Inner sharable, writes only.
_ARM64_BARRIER_ISHLD Inner sharable, read only.
_ARM64_BARRIER_NSH Non-sharable, reads and writes.
_ARM64_BARRIER_NSHST Non-sharable, writes only.
_ARM64_BARRIER_NSHLD Non-sharable, read only.
_ARM64_BARRIER_OSH Outer sharable, reads and writes.
_ARM64_BARRIER_OSHST Outer sharable, writes only.
_ARM64_BARRIER_OSHLD Outer sharable, read only.

For the __isb intrinsic, the only restriction that is currently valid is _ARM64_BARRIER_SY; all other values are reserved by the architecture.

__iso_volatile_load/store intrinsics

These intrinsic functions explicitly perform loads and stores that aren't subject to compiler optimizations.

__int16 __iso_volatile_load16(const volatile __int16 * Location);
__int32 __iso_volatile_load32(const volatile __int32 * Location);
__int64 __iso_volatile_load64(const volatile __int64 * Location);
__int8 __iso_volatile_load8(const volatile __int8 * Location);

void __iso_volatile_store16(volatile __int16 * Location, __int16 Value);
void __iso_volatile_store32(volatile __int32 * Location, __int32 Value);
void __iso_volatile_store64(volatile __int64 * Location, __int64 Value);
void __iso_volatile_store8(volatile __int8 * Location, __int8 Value);

Parameters

Location
The address of a memory location to read from or write to.

Value
The value to write to the specified memory location (store intrinsics only).

Return value (load intrinsics only)

The value of the memory location that is specified by Location.

Remarks

You can use the __iso_volatile_load8/16/32/64 and __iso_volatile_store8/16/32/64 intrinsics to explicitly perform memory accesses that aren't subject to compiler optimizations. The compiler can't remove, synthetize, or change the relative order of these operations. However, it doesn't generate implicit hardware memory barriers. Therefore, the hardware may still reorder the observable memory accesses across multiple threads. More precisely, these intrinsics are equivalent to the following expressions as compiled under /volatile:iso.

int a = __iso_volatile_load32(p);    // equivalent to: int a = *(const volatile __int32*)p;
__iso_volatile_store32(p, a);        // equivalent to: *(volatile __int32*)p = a;

Notice that the intrinsics take volatile pointers to accommodate volatile variables. However, there's no requirement or recommendation to use volatile pointers as arguments. The semantics of these operations are exactly the same if a regular, non-volatile type is used.

For more information about the /volatile:iso command-line argument, see /volatile (volatile keyword interpretation).

ARM64 support for intrinsics from other architectures

The following table lists intrinsics from other architectures that are supported on ARM64 platforms. Where the behavior of an intrinsic on ARM64 differs from its behavior on other hardware architectures, additional details are noted.

Function Name Function Prototype
__assume void __assume(int)
__code_seg void __code_seg(const char *)
__debugbreak void __cdecl __debugbreak(void)
__fastfail __declspec(noreturn) void __fastfail(unsigned int)
__nop void __nop(void)
__yield void __yield(void) Note: On ARM64 platforms, this function generates the YIELD instruction. This instruction indicates that the thread is performing a task that may be temporarily suspended from execution—for example, a spinlock—without adversely affecting the program. It enables the CPU to execute other tasks during execution cycles that would otherwise be wasted.
_AddressOfReturnAddress void * _AddressOfReturnAddress(void)
_BitScanForward unsigned char _BitScanForward(unsigned long * _Index, unsigned long _Mask)
_BitScanForward64 unsigned char _BitScanForward64(unsigned long * _Index, unsigned __int64 _Mask)
_BitScanReverse unsigned char _BitScanReverse(unsigned long * _Index, unsigned long _Mask)
_BitScanReverse64 unsigned char _BitScanReverse64(unsigned long * _Index, unsigned __int64 _Mask)
_bittest unsigned char _bittest(long const *, long)
_bittest64 unsigned char _bittest64(__int64 const *, __int64)
_bittestandcomplement unsigned char _bittestandcomplement(long *, long)
_bittestandcomplement64 unsigned char _bittestandcomplement64(__int64 *, __int64)
_bittestandreset unsigned char _bittestandreset(long *, long)
_bittestandreset64 unsigned char _bittestandreset64(__int64 *, __int64)
_bittestandset unsigned char _bittestandset(long *, long)
_bittestandset64 unsigned char _bittestandset64(__int64 *, __int64)
_byteswap_uint64 unsigned __int64 __cdecl _byteswap_uint64(unsigned __int64)
_byteswap_ulong unsigned long __cdecl _byteswap_ulong(unsigned long)
_byteswap_ushort unsigned short __cdecl _byteswap_ushort(unsigned short)
_disable void __cdecl _disable(void) Note: On ARM64 platforms, this function generates the instruction MSR DAIFCLR,#2; it's only available as an intrinsic.
_enable void __cdecl _enable(void) Note: On ARM64 platforms, this function generates the instruction MSR DAIFSET,#2; it's only available as an intrinsic.
_lrotl unsigned long __cdecl _lrotl(unsigned long, int)
_lrotr unsigned long __cdecl _lrotr(unsigned long, int)
_ReadBarrier void _ReadBarrier(void)
_ReadWriteBarrier void _ReadWriteBarrier(void)
_ReturnAddress void * _ReturnAddress(void)
_rotl unsigned int __cdecl _rotl(unsigned int _Value, int _Shift)
_rotl16 unsigned short _rotl16(unsigned short _Value, unsigned char _Shift)
_rotl64 unsigned __int64 __cdecl _rotl64(unsigned __int64 _Value, int _Shift)
_rotl8 unsigned char _rotl8(unsigned char _Value, unsigned char _Shift)
_rotr unsigned int __cdecl _rotr(unsigned int _Value, int _Shift)
_rotr16 unsigned short _rotr16(unsigned short _Value, unsigned char _Shift)
_rotr64 unsigned __int64 __cdecl _rotr64(unsigned __int64 _Value, int _Shift)
_rotr8 unsigned char _rotr8(unsigned char _Value, unsigned char _Shift)
_setjmpex int __cdecl _setjmpex(jmp_buf)
_WriteBarrier void _WriteBarrier(void)

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Interlocked intrinsics

Interlocked intrinsics are a set of intrinsics that are used to perform atomic read-modify-write operations. Some of them are common to all platforms. They're listed separately here because there are a large number of them. Because their definitions are mostly redundant, it's easier to think about them in general terms. Their names can be used to derive the exact behaviors.

The following table summarizes the ARM64 support of the non-bittest interlocked intrinsics. Each cell in the table corresponds to a name that is derived by appending the operation name in the left-most cell of the row and the type name in the top-most cell of the column to _Interlocked. For example, the cell at the intersection of the Xor row and the 8 column corresponds to _InterlockedXor8 and is fully supported. Most of the supported functions offer these optional suffixes: _acq, _rel, and _nf. The _acq suffix indicates an "acquire" semantic and the _rel suffix indicates a "release" semantic. The _nf or "no fence" suffix is unique to ARM and ARM64 and is discussed in the next section.

Operation 8 16 32 64 128 P
Add None None Full Full None None
And Full Full Full Full None None
CompareExchange Full Full Full Full Full Full
Decrement None Full Full Full None None
Exchange Full Full Full Full None Full
ExchangeAdd Full Full Full Full None None
Increment None Full Full Full None None
Or Full Full Full Full None None
Xor Full Full Full Full None None

Key:

  • Full: supports plain, _acq, _rel, and _nf forms.

  • None: Not supported

_nf (no fence) suffix

The _nf or "no fence" suffix indicates that the operation doesn't behave as any kind of memory barrier, in contrast to the other three forms (plain, _acq, and _rel), which all behave as some kind of barrier. One possible use of the _nf forms is to maintain a statistic counter that is updated by multiple threads at the same time but whose value isn't otherwise used while multiple threads are executing.

List of interlocked intrinsics

Function Name Function Prototype
_InterlockedAdd long _InterlockedAdd(long _volatile *, long)
_InterlockedAdd64 __int64 _InterlockedAdd64(__int64 volatile *, __int64)
_InterlockedAdd64_acq __int64 _InterlockedAdd64_acq(__int64 volatile *, __int64)
_InterlockedAdd64_nf __int64 _InterlockedAdd64_nf(__int64 volatile *, __int64)
_InterlockedAdd64_rel __int64 _InterlockedAdd64_rel(__int64 volatile *, __int64)
_InterlockedAdd_acq long _InterlockedAdd_acq(long volatile *, long)
_InterlockedAdd_nf long _InterlockedAdd_nf(long volatile *, long)
_InterlockedAdd_rel long _InterlockedAdd_rel(long volatile *, long)
_InterlockedAnd long _InterlockedAnd(long volatile *, long)
_InterlockedAnd16 short _InterlockedAnd16(short volatile *, short)
_InterlockedAnd16_acq short _InterlockedAnd16_acq(short volatile *, short)
_InterlockedAnd16_nf short _InterlockedAnd16_nf(short volatile *, short)
_InterlockedAnd16_rel short _InterlockedAnd16_rel(short volatile *, short)
_InterlockedAnd64 __int64 _InterlockedAnd64(__int64 volatile *, __int64)
_InterlockedAnd64_acq __int64 _InterlockedAnd64_acq(__int64 volatile *, __int64)
_InterlockedAnd64_nf __int64 _InterlockedAnd64_nf(__int64 volatile *, __int64)
_InterlockedAnd64_rel __int64 _InterlockedAnd64_rel(__int64 volatile *, __int64)
_InterlockedAnd8 char _InterlockedAnd8(char volatile *, char)
_InterlockedAnd8_acq char _InterlockedAnd8_acq(char volatile *, char)
_InterlockedAnd8_nf char _InterlockedAnd8_nf(char volatile *, char)
_InterlockedAnd8_rel char _InterlockedAnd8_rel(char volatile *, char)
_InterlockedAnd_acq long _InterlockedAnd_acq(long volatile *, long)
_InterlockedAnd_nf long _InterlockedAnd_nf(long volatile *, long)
_InterlockedAnd_rel long _InterlockedAnd_rel(long volatile *, long)
_InterlockedCompareExchange long __cdecl _InterlockedCompareExchange(long volatile *, long, long)
_InterlockedCompareExchange_acq long _InterlockedCompareExchange_acq(long volatile *, long, long)
_InterlockedCompareExchange_nf long _InterlockedCompareExchange_nf(long volatile *, long, long)
_InterlockedCompareExchange_rel long _InterlockedCompareExchange_rel(long volatile *, long, long)
_InterlockedCompareExchange16 short _InterlockedCompareExchange16(short volatile *, short, short)
_InterlockedCompareExchange16_acq short _InterlockedCompareExchange16_acq(short volatile *, short, short)
_InterlockedCompareExchange16_nf short _InterlockedCompareExchange16_nf(short volatile *, short, short)
_InterlockedCompareExchange16_rel short _InterlockedCompareExchange16_rel(short volatile *, short, short)
_InterlockedCompareExchange64 __int64 _InterlockedCompareExchange64(__int64 volatile *, __int64, __int64)
_InterlockedCompareExchange64_acq __int64 _InterlockedCompareExchange64_acq(__int64 volatile *, __int64, __int64)
_InterlockedCompareExchange64_nf __int64 _InterlockedCompareExchange64_nf(__int64 volatile *, __int64, __int64)
_InterlockedCompareExchange64_rel __int64 _InterlockedCompareExchange64_rel(__int64 volatile *, __int64, __int64)
_InterlockedCompareExchange8 char _InterlockedCompareExchange8(char volatile *, char, char)
_InterlockedCompareExchange8_acq char _InterlockedCompareExchange8_acq(char volatile *, char, char)
_InterlockedCompareExchange8_nf char _InterlockedCompareExchange8_nf(char volatile *, char, char)
_InterlockedCompareExchange8_rel char _InterlockedCompareExchange8_rel(char volatile *, char, char)
_InterlockedCompareExchangePointer void * _InterlockedCompareExchangePointer(void * volatile *, void *, void *)
_InterlockedCompareExchangePointer_acq void * _InterlockedCompareExchangePointer_acq(void * volatile *, void *, void *)
_InterlockedCompareExchangePointer_nf void * _InterlockedCompareExchangePointer_nf(void * volatile *, void *, void *)
_InterlockedCompareExchangePointer_rel void * _InterlockedCompareExchangePointer_rel(void * volatile *, void *, void *)
_InterlockedCompareExchange128 unsigned char _InterlockedCompareExchange128(__int64 volatile * _Destination, __int64 _ExchangeHigh, __int64 _ExchangeLow, __int64 * _ComparandResult)
_InterlockedCompareExchange128_acq unsigned char _InterlockedCompareExchange128_acq(__int64 volatile * _Destination, __int64 _ExchangeHigh, __int64 _ExchangeLow, __int64 * _ComparandResult)
_InterlockedCompareExchange128_nf unsigned char _InterlockedCompareExchange128_nf(__int64 volatile * _Destination, __int64 _ExchangeHigh, __int64 _ExchangeLow, __int64 * _ComparandResult)
_InterlockedCompareExchange128_rel unsigned char _InterlockedCompareExchange128_rel(__int64 volatile * _Destination, __int64 _ExchangeHigh, __int64 _ExchangeLow, __int64 * _ComparandResult)
_InterlockedDecrement long __cdecl _InterlockedDecrement(long volatile *)
_InterlockedDecrement16 short _InterlockedDecrement16(short volatile *)
_InterlockedDecrement16_acq short _InterlockedDecrement16_acq(short volatile *)
_InterlockedDecrement16_nf short _InterlockedDecrement16_nf(short volatile *)
_InterlockedDecrement16_rel short _InterlockedDecrement16_rel(short volatile *)
_InterlockedDecrement64 __int64 _InterlockedDecrement64(__int64 volatile *)
_InterlockedDecrement64_acq __int64 _InterlockedDecrement64_acq(__int64 volatile *)
_InterlockedDecrement64_nf __int64 _InterlockedDecrement64_nf(__int64 volatile *)
_InterlockedDecrement64_rel __int64 _InterlockedDecrement64_rel(__int64 volatile *)
_InterlockedDecrement_acq long _InterlockedDecrement_acq(long volatile *)
_InterlockedDecrement_nf long _InterlockedDecrement_nf(long volatile *)
_InterlockedDecrement_rel long _InterlockedDecrement_rel(long volatile *)
_InterlockedExchange long __cdecl _InterlockedExchange(long volatile * _Target, long)
_InterlockedExchange_acq long _InterlockedExchange_acq(long volatile * _Target, long)
_InterlockedExchange_nf long _InterlockedExchange_nf(long volatile * _Target, long)
_InterlockedExchange_rel long _InterlockedExchange_rel(long volatile * _Target, long)
_InterlockedExchange16 short _InterlockedExchange16(short volatile * _Target, short)
_InterlockedExchange16_acq short _InterlockedExchange16_acq(short volatile * _Target, short)
_InterlockedExchange16_nf short _InterlockedExchange16_nf(short volatile * _Target, short)
_InterlockedExchange16_rel short _InterlockedExchange16_rel(short volatile * _Target, short)
_InterlockedExchange64 __int64 _InterlockedExchange64(__int64 volatile * _Target, __int64)
_InterlockedExchange64_acq __int64 _InterlockedExchange64_acq(__int64 volatile * _Target, __int64)
_InterlockedExchange64_nf __int64 _InterlockedExchange64_nf(__int64 volatile * _Target, __int64)
_InterlockedExchange64_rel __int64 _InterlockedExchange64_rel(__int64 volatile * _Target, __int64)
_InterlockedExchange8 char _InterlockedExchange8(char volatile * _Target, char)
_InterlockedExchange8_acq char _InterlockedExchange8_acq(char volatile * _Target, char)
_InterlockedExchange8_nf char _InterlockedExchange8_nf(char volatile * _Target, char)
_InterlockedExchange8_rel char _InterlockedExchange8_rel(char volatile * _Target, char)
_InterlockedExchangeAdd long __cdecl _InterlockedExchangeAdd(long volatile *, long)
_InterlockedExchangeAdd16 short _InterlockedExchangeAdd16(short volatile *, short)
_InterlockedExchangeAdd16_acq short _InterlockedExchangeAdd16_acq(short volatile *, short)
_InterlockedExchangeAdd16_nf short _InterlockedExchangeAdd16_nf(short volatile *, short)
_InterlockedExchangeAdd16_rel short _InterlockedExchangeAdd16_rel(short volatile *, short)
_InterlockedExchangeAdd64 __int64 _InterlockedExchangeAdd64(__int64 volatile *, __int64)
_InterlockedExchangeAdd64_acq __int64 _InterlockedExchangeAdd64_acq(__int64 volatile *, __int64)
_InterlockedExchangeAdd64_nf __int64 _InterlockedExchangeAdd64_nf(__int64 volatile *, __int64)
_InterlockedExchangeAdd64_rel __int64 _InterlockedExchangeAdd64_rel(__int64 volatile *, __int64)
_InterlockedExchangeAdd8 char _InterlockedExchangeAdd8(char volatile *, char)
_InterlockedExchangeAdd8_acq char _InterlockedExchangeAdd8_acq(char volatile *, char)
_InterlockedExchangeAdd8_nf char _InterlockedExchangeAdd8_nf(char volatile *, char)
_InterlockedExchangeAdd8_rel char _InterlockedExchangeAdd8_rel(char volatile *, char)
_InterlockedExchangeAdd_acq long _InterlockedExchangeAdd_acq(long volatile *, long)
_InterlockedExchangeAdd_nf long _InterlockedExchangeAdd_nf(long volatile *, long)
_InterlockedExchangeAdd_rel long _InterlockedExchangeAdd_rel(long volatile *, long)
_InterlockedExchangePointer void * _InterlockedExchangePointer(void * volatile * _Target, void *)
_InterlockedExchangePointer_acq void * _InterlockedExchangePointer_acq(void * volatile * _Target, void *)
_InterlockedExchangePointer_nf void * _InterlockedExchangePointer_nf(void * volatile * _Target, void *)
_InterlockedExchangePointer_rel void * _InterlockedExchangePointer_rel(void * volatile * _Target, void *)
_InterlockedIncrement long __cdecl _InterlockedIncrement(long volatile *)
_InterlockedIncrement16 short _InterlockedIncrement16(short volatile *)
_InterlockedIncrement16_acq short _InterlockedIncrement16_acq(short volatile *)
_InterlockedIncrement16_nf short _InterlockedIncrement16_nf(short volatile *)
_InterlockedIncrement16_rel short _InterlockedIncrement16_rel(short volatile *)
_InterlockedIncrement64 __int64 _InterlockedIncrement64(__int64 volatile *)
_InterlockedIncrement64_acq __int64 _InterlockedIncrement64_acq(__int64 volatile *)
_InterlockedIncrement64_nf __int64 _InterlockedIncrement64_nf(__int64 volatile *)
_InterlockedIncrement64_rel __int64 _InterlockedIncrement64_rel(__int64 volatile *)
_InterlockedIncrement_acq long _InterlockedIncrement_acq(long volatile *)
_InterlockedIncrement_nf long _InterlockedIncrement_nf(long volatile *)
_InterlockedIncrement_rel long _InterlockedIncrement_rel(long volatile *)
_InterlockedOr long _InterlockedOr(long volatile *, long)
_InterlockedOr16 short _InterlockedOr16(short volatile *, short)
_InterlockedOr16_acq short _InterlockedOr16_acq(short volatile *, short)
_InterlockedOr16_nf short _InterlockedOr16_nf(short volatile *, short)
_InterlockedOr16_rel short _InterlockedOr16_rel(short volatile *, short)
_InterlockedOr64 __int64 _InterlockedOr64(__int64 volatile *, __int64)
_InterlockedOr64_acq __int64 _InterlockedOr64_acq(__int64 volatile *, __int64)
_InterlockedOr64_nf __int64 _InterlockedOr64_nf(__int64 volatile *, __int64)
_InterlockedOr64_rel __int64 _InterlockedOr64_rel(__int64 volatile *, __int64)
_InterlockedOr8 char _InterlockedOr8(char volatile *, char)
_InterlockedOr8_acq char _InterlockedOr8_acq(char volatile *, char)
_InterlockedOr8_nf char _InterlockedOr8_nf(char volatile *, char)
_InterlockedOr8_rel char _InterlockedOr8_rel(char volatile *, char)
_InterlockedOr_acq long _InterlockedOr_acq(long volatile *, long)
_InterlockedOr_nf long _InterlockedOr_nf(long volatile *, long)
_InterlockedOr_rel long _InterlockedOr_rel(long volatile *, long)
_InterlockedXor long _InterlockedXor(long volatile *, long)
_InterlockedXor16 short _InterlockedXor16(short volatile *, short)
_InterlockedXor16_acq short _InterlockedXor16_acq(short volatile *, short)
_InterlockedXor16_nf short _InterlockedXor16_nf(short volatile *, short)
_InterlockedXor16_rel short _InterlockedXor16_rel(short volatile *, short)
_InterlockedXor64 __int64 _InterlockedXor64(__int64 volatile *, __int64)
_InterlockedXor64_acq __int64 _InterlockedXor64_acq(__int64 volatile *, __int64)
_InterlockedXor64_nf __int64 _InterlockedXor64_nf(__int64 volatile *, __int64)
_InterlockedXor64_rel __int64 _InterlockedXor64_rel(__int64 volatile *, __int64)
_InterlockedXor8 char _InterlockedXor8(char volatile *, char)
_InterlockedXor8_acq char _InterlockedXor8_acq(char volatile *, char)
_InterlockedXor8_nf char _InterlockedXor8_nf(char volatile *, char)
_InterlockedXor8_rel char _InterlockedXor8_rel(char volatile *, char)
_InterlockedXor_acq long _InterlockedXor_acq(long volatile *, long)
_InterlockedXor_nf long _InterlockedXor_nf(long volatile *, long)
_InterlockedXor_rel long _InterlockedXor_rel(long volatile *, long)

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_interlockedbittest intrinsics

The plain interlocked bit test intrinsics are common to all platforms. ARM64 adds _acq, _rel, and _nf variants, which just modify the barrier semantics of an operation, as described in _nf (no fence) Suffix earlier in this article.

Function Name Function Prototype
_interlockedbittestandreset unsigned char _interlockedbittestandreset(long volatile *, long)
_interlockedbittestandreset_acq unsigned char _interlockedbittestandreset_acq(long volatile *, long)
_interlockedbittestandreset_nf unsigned char _interlockedbittestandreset_nf(long volatile *, long)
_interlockedbittestandreset_rel unsigned char _interlockedbittestandreset_rel(long volatile *, long)
_interlockedbittestandreset64 unsigned char _interlockedbittestandreset64(__int64 volatile *, __int64)
_interlockedbittestandreset64_acq unsigned char _interlockedbittestandreset64_acq(__int64 volatile *, __int64)
_interlockedbittestandreset64_nf unsigned char _interlockedbittestandreset64_nf(__int64 volatile *, __int64)
_interlockedbittestandreset64_rel unsigned char _interlockedbittestandreset64_rel(__int64 volatile *, __int64)
_interlockedbittestandset unsigned char _interlockedbittestandset(long volatile *, long)
_interlockedbittestandset_acq unsigned char _interlockedbittestandset_acq(long volatile *, long)
_interlockedbittestandset_nf unsigned char _interlockedbittestandset_nf(long volatile *, long)
_interlockedbittestandset_rel unsigned char _interlockedbittestandset_rel(long volatile *, long)
_interlockedbittestandset64 unsigned char _interlockedbittestandset64(__int64 volatile *, __int64)
_interlockedbittestandset64_acq unsigned char _interlockedbittestandset64_acq(__int64 volatile *, __int64)
_interlockedbittestandset64_nf unsigned char _interlockedbittestandset64_nf(__int64 volatile *, __int64)
_interlockedbittestandset64_rel unsigned char _interlockedbittestandset64_rel(__int64 volatile *, __int64)

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See also

Compiler intrinsics
ARM intrinsics
ARM assembler reference
C++ language reference