Microsoft*-Compatible Intrinsics for Dual-Core Intel® Itanium® Processor 9000 Sequence

The Dual-Core Intel® Itanium® processor 9000 sequence supports the intrinsics listed in the table below. These intrinsics are also compatible with the Microsoft* compiler. These intrinsics each generate IA-64 instructions. The second alpha-numerical chain in the intrinsic name represents the IA-64 instruction the intrinsic generates. For example, the intrinsic _int64_cmp8xchg generates the cmp8xchg IA-64 instruction.

For more information about the instructions these intrinsics generate, please see the documentation area of the Itanium® processor website.

Intrinsic Name	Operation	Corresponding IA-64 Instruction
_InterlockedCompare64Exchange128	Compare and exchange
_InterlockedCompare64Exchange128_acq	Compare and Exchange
_InterlockedCompare64Exchange128_rel	Compare and Exchange
__load128	Read
__load128_acq	Read
__store128	Store
__store128_rel	Store

__int64 _InterlockedCompare64Exchange128(__int64 volatile * <Destination>, __int64 <ExchangeHigh>, __int64 <ExchangeLow>, __int64 <Comperand>)

Generates a compare and exchange IA-64 instruction. Returns the lowest 64-bit value of the destination.

The following table describes each argument for this intrinsic.

Destination	ExchangeHigh	ExchangeLow	Comperand
Pointer to the 128-bit Destination value	Highest 64 bits of the Exchange value	Lowest 64 bits of the Exchange value	Value to compare with Destination

__int64 _InterlockedCompare64Exchange128_acq( __int64 volatile * <Destination>, __int64 <ExchangeHigh>, __int64 <ExchangeLow>, __int64 <Comperand>)

Generates a compare and exchange IA-64 instruction. Same as _InterlockedCompare64Exchange128, but this intrinsic uses acquire semantics. Returns the lowest 64-bit value of the destination.

The following table describes each argument for this intrinsic.

Destination	ExchangeHigh	ExchangeLow	Comperand
Pointer to the 128-bit Destination value	Highest 64 bits of the Exchange value	Lowest 64 bits of the Exchange value	Value to compare with Destination

__int64 _InterlockedCompare64Exchange128_rel( __int64 volatile * <Destination>, __int64 <ExchangeHigh>, __int64 <ExchangeLow>, __int64 <Comperand>

Generates a compare and exchange IA-64 instruction. Same as _InterlockedCompare64Exchange128, but this intrinsic uses release semantics. Returns the lowest 64-bit value of the destination.

The following table describes each argument for this intrinsic.

Destination	ExchangeHigh	ExchangeLow	Comperand
Pointer to the 128-bit Destination value	Highest 64 bits of the Exchange value	Lowest 64 bits of the Exchange value	Value to compare with Destination

__int64 __load128( __int64 volatile * Source, __int64 *<DestinationHigh>)

Generates the IA-64 instruction that atomically reads 128 bits from the memory location. Returns the lowest 64-bit value of the 128-bit loaded value.

The following table describes each argument for this intrinsic.

Source	DestinationHigh
Pointer to the 128-bit Source value	Pointer to the location in memory that stores the highest 64 bits of the 128-bit loaded value

__int64 __load128_acq( __int64 volatile * <Source>, __int64 *<DestinationHigh>

Generates the IA-64 instruction that atomically reads 128 bits from the memory location. Same as __load128, but the this intrinsic uses acquire semantics. Returns the lowest 64-bit value of the 128-bit loaded value.

The following table describes each argument for this intrinsic.

Source	DestinationHigh
Pointer to the 128-bit Source value	Pointer to the location in memory that stores the highest 64 bits of the 128-bit loaded value

__void __store128( __int64 volatile * <Destination>, __int64 <SourceHigh> __int64 <SourceLow>)

Generates the IA-64 instruction that atomically stores 128 bits at the destination memory location. No returns.

Destination	SourceHigh	SourceLow
Pointer to the 128-bit Destination value	The highest 64 bits of the value to be stored	The lowest 64 bits of the value to be stored

__void __store128_rel( __int64 volatile * <Destination>, __int64 <SourceHigh> __int64 <SourceLow>)

Generates the IA-64 instruction that atomically stores 128 bits at the destination memory location. Same as __store128, but this intrinsic uses release semantics. No returns.

Destination	SourceHigh	SourceLow
Pointer to the 128-bit Destination value	The highest 64 bits of the value to be stored	The lowest 64 bits of the value to be stored