ARM DSP-enhanced Intrinsic Functions

9/7/2007

All ARM DSP instructions are supported as intrinsic functions. To use the ARM DSP intrinsics, include the armintr.h header.

The following ARM DSP Instructions have intrinsic functions defined for them.

Function	Corresponding ARM DSP instruction	Description
_SmulAddLo_SW_SL _SmulAddHi_SW_SL _SmulAddHiLo_SW_SL _SmulAddLoHi_SW_SL	SMLAxy	A signed-integer multiply and accumulate operation: 16x16-bit multiply followed by a 32-bit add.
_SmulAddWLo_SW_SL _SmulAddWHi_SW_SL	SMLAWy	A 32x16-bit multiply operation, followed by a 32-bit add of the upper 32 bits of the 48 bit product.
_SmulAddHi_SW_SQ _SmulAddLo_SW_SQ _SmulAddHiLo_SW_SQ _SmulAddLoHi_SW_SQ	SMLALxy	A 16x16-bit multiply operation, followed by a 64-bit add of the product, with a 64-bit integer.
_SmulLo_SW_SL _SmulHi_SW_SL _SmulHiLo_SW_SL _SmulLoHi_SW_SL	SMULxy	A signed-integer 16x16-bit multiply operation.
_SmulWLo_SW_SL _SmulWHi_SW_SL	SMULWy	A signed-integer 32x16-bit multiply operation, returning the upper 32-bits.
_AddSatInt	QADD	A saturating add instruction.
_SubSatInt	QSUB	A saturating subtract instruction.
_DAddSatInt	QDADD	An instruction to double an integer and saturate, and then add to a second integer and saturate.
_DSubSatInt	QDSUB	An instruction to double an integer and saturate, and then subtract from a second integer and saturate.
_ReadCoProcessor _WriteCoProcessor	MRRC, MCRR	An operation to transfer values from a coprocessor to two ARM registers.

See Also

Reference

ARM XSCALE Intrinsic Functions

Other Resources

Intrinsic Functions for Device Compilers