AI Engine Intrinsics  (AIE) r2p21
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Overview

16 bit complex by 32 bit complex using X buffer conjugation

Functions

v4cacc80 lmac4_cn (v4cacc80 acc, v32cint16 xbuff, int xstart, unsigned int xoffsets, v4cint32 zbuff, int zstart, unsigned int zoffsets)
 Complex multiply-accumulate intrinsic function with x buffer conjugation .
 
v4cacc80 lmac4_cn (v4cacc80 acc, v16cint16 xbuff, int xstart, unsigned int xoffsets, v4cint32 zbuff, int zstart, unsigned int zoffsets)
 Complex multiply-accumulate intrinsic function with x buffer conjugation using small X input buffer.
 
v4cacc80 lmsc4_cn (v4cacc80 acc, v32cint16 xbuff, int xstart, unsigned int xoffsets, v4cint32 zbuff, int zstart, unsigned int zoffsets)
 Complex multiply-subtract intrinsic function with x buffer conjugation .
 
v4cacc80 lmsc4_cn (v4cacc80 acc, v16cint16 xbuff, int xstart, unsigned int xoffsets, v4cint32 zbuff, int zstart, unsigned int zoffsets)
 Complex multiply-subtract intrinsic function with x buffer conjugation using small X input buffer.
 
v4cacc80 lmul4_cn (v32cint16 xbuff, int xstart, unsigned int xoffsets, v4cint32 zbuff, int zstart, unsigned int zoffsets)
 Complex multiply intrinsic function with x buffer conjugation .
 
v4cacc80 lmul4_cn (v16cint16 xbuff, int xstart, unsigned int xoffsets, v4cint32 zbuff, int zstart, unsigned int zoffsets)
 Complex multiply intrinsic function with x buffer conjugation using small X input buffer.
 
v4cacc80 lnegmul4_cn (v32cint16 xbuff, int xstart, unsigned int xoffsets, v4cint32 zbuff, int zstart, unsigned int zoffsets)
 Complex multiply-negate intrinsic function with x buffer conjugation .
 
v4cacc80 lnegmul4_cn (v16cint16 xbuff, int xstart, unsigned int xoffsets, v4cint32 zbuff, int zstart, unsigned int zoffsets)
 Complex multiply-negate intrinsic function with x buffer conjugation using small X input buffer.
 
v4cacc48 mac4_cn (v4cacc48 acc, v32cint16 xbuff, int xstart, unsigned int xoffsets, v4cint32 zbuff, int zstart, unsigned int zoffsets)
 Complex multiply-accumulate intrinsic function with x buffer conjugation .
 
v4cacc48 mac4_cn (v4cacc48 acc, v16cint16 xbuff, int xstart, unsigned int xoffsets, v4cint32 zbuff, int zstart, unsigned int zoffsets)
 Complex multiply-accumulate intrinsic function with x buffer conjugation using small X input buffer.
 
v4cacc48 msc4_cn (v4cacc48 acc, v32cint16 xbuff, int xstart, unsigned int xoffsets, v4cint32 zbuff, int zstart, unsigned int zoffsets)
 Complex multiply-subtract intrinsic function with x buffer conjugation .
 
v4cacc48 msc4_cn (v4cacc48 acc, v16cint16 xbuff, int xstart, unsigned int xoffsets, v4cint32 zbuff, int zstart, unsigned int zoffsets)
 Complex multiply-subtract intrinsic function with x buffer conjugation using small X input buffer.
 
v4cacc48 mul4_cn (v32cint16 xbuff, int xstart, unsigned int xoffsets, v4cint32 zbuff, int zstart, unsigned int zoffsets)
 Complex multiply intrinsic function with x buffer conjugation .
 
v4cacc48 mul4_cn (v16cint16 xbuff, int xstart, unsigned int xoffsets, v4cint32 zbuff, int zstart, unsigned int zoffsets)
 Complex multiply intrinsic function with x buffer conjugation using small X input buffer.
 
v4cacc48 negmul4_cn (v32cint16 xbuff, int xstart, unsigned int xoffsets, v4cint32 zbuff, int zstart, unsigned int zoffsets)
 Complex multiply-negate intrinsic function with x buffer conjugation .
 
v4cacc48 negmul4_cn (v16cint16 xbuff, int xstart, unsigned int xoffsets, v4cint32 zbuff, int zstart, unsigned int zoffsets)
 Complex multiply-negate intrinsic function with x buffer conjugation using small X input buffer.
 

Function Documentation

v4cacc80 lmac4_cn ( v4cacc80  acc,
v32cint16  xbuff,
int  xstart,
unsigned int  xoffsets,
v4cint32  zbuff,
int  zstart,
unsigned int  zoffsets 
)

Complex multiply-accumulate intrinsic function with x buffer conjugation .

acc0 += z00*cnj(x00)
acc1 += z10*cnj(x10)
acc2 += z20*cnj(x20)
acc3 += z30*cnj(x30)

Parameters

Input/OutputType Comments
return v4cacc80 Returned accumulation vector (4 x cint80 lanes)
acc v4cacc80 Incoming accumulation vector (4 x cint80 lanes)
xbuff v32cint16Input buffer of 32 elements of type cint16
xstart int Starting position offset applied to all lanes of input from X buffer.
xoffsets unsigned int 4b offset for each lane, applied to the x buffer. LSB apply to first lane
zbuff v4cint32Input buffer of 4 elements of type cint32
zstart int Starting position offset applied to all lanes for input from Z buffer. This must be a compile time constant. Only the 4 LSB of the argument are used.
zoffsetsunsigned int 4b offset for each lane, applied to input from Z buffer. LSB apply to first lane
Note
  • For more information on how data selection works from the buffers go here. The data buffer and coefficient buffer in this intrinsic use the general scheme.
  • Parameter 'zstart' must be a compile time constant.
v4cacc80 lmac4_cn ( v4cacc80  acc,
v16cint16  xbuff,
int  xstart,
unsigned int  xoffsets,
v4cint32  zbuff,
int  zstart,
unsigned int  zoffsets 
)

Complex multiply-accumulate intrinsic function with x buffer conjugation using small X input buffer.

acc0 += z00*cnj(x00)
acc1 += z10*cnj(x10)
acc2 += z20*cnj(x20)
acc3 += z30*cnj(x30)

Parameters

Input/OutputType Comments
return v4cacc80 Returned accumulation vector (4 x cint80 lanes)
acc v4cacc80 Incoming accumulation vector (4 x cint80 lanes)
xbuff v16cint16Input buffer of 16 elements of type cint16
xstart int Starting position offset applied to all lanes of input from X buffer.
xoffsets unsigned int 4b offset for each lane, applied to the x buffer. LSB apply to first lane
zbuff v4cint32Input buffer of 4 elements of type cint32
zstart int Starting position offset applied to all lanes for input from Z buffer. This must be a compile time constant. Only the 4 LSB of the argument are used.
zoffsetsunsigned int 4b offset for each lane, applied to input from Z buffer. LSB apply to first lane
Note
  • For more information on how data selection works from the buffers go here. The data buffer and coefficient buffer in this intrinsic use the general scheme.
  • Parameter 'zstart' must be a compile time constant.
v4cacc80 lmsc4_cn ( v4cacc80  acc,
v32cint16  xbuff,
int  xstart,
unsigned int  xoffsets,
v4cint32  zbuff,
int  zstart,
unsigned int  zoffsets 
)

Complex multiply-subtract intrinsic function with x buffer conjugation .

acc0 -= z00*cnj(x00)
acc1 -= z10*cnj(x10)
acc2 -= z20*cnj(x20)
acc3 -= z30*cnj(x30)

Parameters

Input/OutputType Comments
return v4cacc80 Returned accumulation vector (4 x cint80 lanes)
acc v4cacc80 Incoming accumulation vector (4 x cint80 lanes)
xbuff v32cint16Input buffer of 32 elements of type cint16
xstart int Starting position offset applied to all lanes of input from X buffer.
xoffsets unsigned int 4b offset for each lane, applied to the x buffer. LSB apply to first lane
zbuff v4cint32Input buffer of 4 elements of type cint32
zstart int Starting position offset applied to all lanes for input from Z buffer. This must be a compile time constant. Only the 4 LSB of the argument are used.
zoffsetsunsigned int 4b offset for each lane, applied to input from Z buffer. LSB apply to first lane
Note
  • For more information on how data selection works from the buffers go here. The data buffer and coefficient buffer in this intrinsic use the general scheme.
  • Parameter 'zstart' must be a compile time constant.
v4cacc80 lmsc4_cn ( v4cacc80  acc,
v16cint16  xbuff,
int  xstart,
unsigned int  xoffsets,
v4cint32  zbuff,
int  zstart,
unsigned int  zoffsets 
)

Complex multiply-subtract intrinsic function with x buffer conjugation using small X input buffer.

acc0 -= z00*cnj(x00)
acc1 -= z10*cnj(x10)
acc2 -= z20*cnj(x20)
acc3 -= z30*cnj(x30)

Parameters

Input/OutputType Comments
return v4cacc80 Returned accumulation vector (4 x cint80 lanes)
acc v4cacc80 Incoming accumulation vector (4 x cint80 lanes)
xbuff v16cint16Input buffer of 16 elements of type cint16
xstart int Starting position offset applied to all lanes of input from X buffer.
xoffsets unsigned int 4b offset for each lane, applied to the x buffer. LSB apply to first lane
zbuff v4cint32Input buffer of 4 elements of type cint32
zstart int Starting position offset applied to all lanes for input from Z buffer. This must be a compile time constant. Only the 4 LSB of the argument are used.
zoffsetsunsigned int 4b offset for each lane, applied to input from Z buffer. LSB apply to first lane
Note
  • For more information on how data selection works from the buffers go here. The data buffer and coefficient buffer in this intrinsic use the general scheme.
  • Parameter 'zstart' must be a compile time constant.
v4cacc80 lmul4_cn ( v32cint16  xbuff,
int  xstart,
unsigned int  xoffsets,
v4cint32  zbuff,
int  zstart,
unsigned int  zoffsets 
)

Complex multiply intrinsic function with x buffer conjugation .

acc0 = z00*cnj(x00)
acc1 = z10*cnj(x10)
acc2 = z20*cnj(x20)
acc3 = z30*cnj(x30)

Parameters

Input/OutputType Comments
return v4cacc80 Returned accumulation vector (4 x cint80 lanes)
xbuff v32cint16Input buffer of 32 elements of type cint16
xstart int Starting position offset applied to all lanes of input from X buffer.
xoffsets unsigned int 4b offset for each lane, applied to the x buffer. LSB apply to first lane
zbuff v4cint32Input buffer of 4 elements of type cint32
zstart int Starting position offset applied to all lanes for input from Z buffer. This must be a compile time constant. Only the 4 LSB of the argument are used.
zoffsetsunsigned int 4b offset for each lane, applied to input from Z buffer. LSB apply to first lane
Note
  • For more information on how data selection works from the buffers go here. The data buffer and coefficient buffer in this intrinsic use the general scheme.
  • Parameter 'zstart' must be a compile time constant.
v4cacc80 lmul4_cn ( v16cint16  xbuff,
int  xstart,
unsigned int  xoffsets,
v4cint32  zbuff,
int  zstart,
unsigned int  zoffsets 
)

Complex multiply intrinsic function with x buffer conjugation using small X input buffer.

acc0 = z00*cnj(x00)
acc1 = z10*cnj(x10)
acc2 = z20*cnj(x20)
acc3 = z30*cnj(x30)

Parameters

Input/OutputType Comments
return v4cacc80 Returned accumulation vector (4 x cint80 lanes)
xbuff v16cint16Input buffer of 16 elements of type cint16
xstart int Starting position offset applied to all lanes of input from X buffer.
xoffsets unsigned int 4b offset for each lane, applied to the x buffer. LSB apply to first lane
zbuff v4cint32Input buffer of 4 elements of type cint32
zstart int Starting position offset applied to all lanes for input from Z buffer. This must be a compile time constant. Only the 4 LSB of the argument are used.
zoffsetsunsigned int 4b offset for each lane, applied to input from Z buffer. LSB apply to first lane
Note
  • For more information on how data selection works from the buffers go here. The data buffer and coefficient buffer in this intrinsic use the general scheme.
  • Parameter 'zstart' must be a compile time constant.
v4cacc80 lnegmul4_cn ( v32cint16  xbuff,
int  xstart,
unsigned int  xoffsets,
v4cint32  zbuff,
int  zstart,
unsigned int  zoffsets 
)

Complex multiply-negate intrinsic function with x buffer conjugation .

acc0 = -( z00*cnj(x00) )
acc1 = -( z10*cnj(x10) )
acc2 = -( z20*cnj(x20) )
acc3 = -( z30*cnj(x30) )

Parameters

Input/OutputType Comments
return v4cacc80 Returned accumulation vector (4 x cint80 lanes)
xbuff v32cint16Input buffer of 32 elements of type cint16
xstart int Starting position offset applied to all lanes of input from X buffer.
xoffsets unsigned int 4b offset for each lane, applied to the x buffer. LSB apply to first lane
zbuff v4cint32Input buffer of 4 elements of type cint32
zstart int Starting position offset applied to all lanes for input from Z buffer. This must be a compile time constant. Only the 4 LSB of the argument are used.
zoffsetsunsigned int 4b offset for each lane, applied to input from Z buffer. LSB apply to first lane
Note
  • For more information on how data selection works from the buffers go here. The data buffer and coefficient buffer in this intrinsic use the general scheme.
  • Parameter 'zstart' must be a compile time constant.
v4cacc80 lnegmul4_cn ( v16cint16  xbuff,
int  xstart,
unsigned int  xoffsets,
v4cint32  zbuff,
int  zstart,
unsigned int  zoffsets 
)

Complex multiply-negate intrinsic function with x buffer conjugation using small X input buffer.

acc0 = -( z00*cnj(x00) )
acc1 = -( z10*cnj(x10) )
acc2 = -( z20*cnj(x20) )
acc3 = -( z30*cnj(x30) )

Parameters

Input/OutputType Comments
return v4cacc80 Returned accumulation vector (4 x cint80 lanes)
xbuff v16cint16Input buffer of 16 elements of type cint16
xstart int Starting position offset applied to all lanes of input from X buffer.
xoffsets unsigned int 4b offset for each lane, applied to the x buffer. LSB apply to first lane
zbuff v4cint32Input buffer of 4 elements of type cint32
zstart int Starting position offset applied to all lanes for input from Z buffer. This must be a compile time constant. Only the 4 LSB of the argument are used.
zoffsetsunsigned int 4b offset for each lane, applied to input from Z buffer. LSB apply to first lane
Note
  • For more information on how data selection works from the buffers go here. The data buffer and coefficient buffer in this intrinsic use the general scheme.
  • Parameter 'zstart' must be a compile time constant.
v4cacc48 mac4_cn ( v4cacc48  acc,
v32cint16  xbuff,
int  xstart,
unsigned int  xoffsets,
v4cint32  zbuff,
int  zstart,
unsigned int  zoffsets 
)

Complex multiply-accumulate intrinsic function with x buffer conjugation .

acc0 += z00*cnj(x00)
acc1 += z10*cnj(x10)
acc2 += z20*cnj(x20)
acc3 += z30*cnj(x30)

Parameters

Input/OutputType Comments
return v4cacc48 Returned accumulation vector (4 x cint48 lanes)
acc v4cacc48 Incoming accumulation vector (4 x cint48 lanes)
xbuff v32cint16Input buffer of 32 elements of type cint16
xstart int Starting position offset applied to all lanes of input from X buffer.
xoffsets unsigned int 4b offset for each lane, applied to the x buffer. LSB apply to first lane
zbuff v4cint32Input buffer of 4 elements of type cint32
zstart int Starting position offset applied to all lanes for input from Z buffer. This must be a compile time constant. Only the 4 LSB of the argument are used.
zoffsetsunsigned int 4b offset for each lane, applied to input from Z buffer. LSB apply to first lane
Note
  • For more information on how data selection works from the buffers go here. The data buffer and coefficient buffer in this intrinsic use the general scheme.
  • Parameter 'zstart' must be a compile time constant.
v4cacc48 mac4_cn ( v4cacc48  acc,
v16cint16  xbuff,
int  xstart,
unsigned int  xoffsets,
v4cint32  zbuff,
int  zstart,
unsigned int  zoffsets 
)

Complex multiply-accumulate intrinsic function with x buffer conjugation using small X input buffer.

acc0 += z00*cnj(x00)
acc1 += z10*cnj(x10)
acc2 += z20*cnj(x20)
acc3 += z30*cnj(x30)

Parameters

Input/OutputType Comments
return v4cacc48 Returned accumulation vector (4 x cint48 lanes)
acc v4cacc48 Incoming accumulation vector (4 x cint48 lanes)
xbuff v16cint16Input buffer of 16 elements of type cint16
xstart int Starting position offset applied to all lanes of input from X buffer.
xoffsets unsigned int 4b offset for each lane, applied to the x buffer. LSB apply to first lane
zbuff v4cint32Input buffer of 4 elements of type cint32
zstart int Starting position offset applied to all lanes for input from Z buffer. This must be a compile time constant. Only the 4 LSB of the argument are used.
zoffsetsunsigned int 4b offset for each lane, applied to input from Z buffer. LSB apply to first lane
Note
  • For more information on how data selection works from the buffers go here. The data buffer and coefficient buffer in this intrinsic use the general scheme.
  • Parameter 'zstart' must be a compile time constant.
v4cacc48 msc4_cn ( v4cacc48  acc,
v32cint16  xbuff,
int  xstart,
unsigned int  xoffsets,
v4cint32  zbuff,
int  zstart,
unsigned int  zoffsets 
)

Complex multiply-subtract intrinsic function with x buffer conjugation .

acc0 -= z00*cnj(x00)
acc1 -= z10*cnj(x10)
acc2 -= z20*cnj(x20)
acc3 -= z30*cnj(x30)

Parameters

Input/OutputType Comments
return v4cacc48 Returned accumulation vector (4 x cint48 lanes)
acc v4cacc48 Incoming accumulation vector (4 x cint48 lanes)
xbuff v32cint16Input buffer of 32 elements of type cint16
xstart int Starting position offset applied to all lanes of input from X buffer.
xoffsets unsigned int 4b offset for each lane, applied to the x buffer. LSB apply to first lane
zbuff v4cint32Input buffer of 4 elements of type cint32
zstart int Starting position offset applied to all lanes for input from Z buffer. This must be a compile time constant. Only the 4 LSB of the argument are used.
zoffsetsunsigned int 4b offset for each lane, applied to input from Z buffer. LSB apply to first lane
Note
  • For more information on how data selection works from the buffers go here. The data buffer and coefficient buffer in this intrinsic use the general scheme.
  • Parameter 'zstart' must be a compile time constant.
v4cacc48 msc4_cn ( v4cacc48  acc,
v16cint16  xbuff,
int  xstart,
unsigned int  xoffsets,
v4cint32  zbuff,
int  zstart,
unsigned int  zoffsets 
)

Complex multiply-subtract intrinsic function with x buffer conjugation using small X input buffer.

acc0 -= z00*cnj(x00)
acc1 -= z10*cnj(x10)
acc2 -= z20*cnj(x20)
acc3 -= z30*cnj(x30)

Parameters

Input/OutputType Comments
return v4cacc48 Returned accumulation vector (4 x cint48 lanes)
acc v4cacc48 Incoming accumulation vector (4 x cint48 lanes)
xbuff v16cint16Input buffer of 16 elements of type cint16
xstart int Starting position offset applied to all lanes of input from X buffer.
xoffsets unsigned int 4b offset for each lane, applied to the x buffer. LSB apply to first lane
zbuff v4cint32Input buffer of 4 elements of type cint32
zstart int Starting position offset applied to all lanes for input from Z buffer. This must be a compile time constant. Only the 4 LSB of the argument are used.
zoffsetsunsigned int 4b offset for each lane, applied to input from Z buffer. LSB apply to first lane
Note
  • For more information on how data selection works from the buffers go here. The data buffer and coefficient buffer in this intrinsic use the general scheme.
  • Parameter 'zstart' must be a compile time constant.
v4cacc48 mul4_cn ( v32cint16  xbuff,
int  xstart,
unsigned int  xoffsets,
v4cint32  zbuff,
int  zstart,
unsigned int  zoffsets 
)

Complex multiply intrinsic function with x buffer conjugation .

acc0 = z00*cnj(x00)
acc1 = z10*cnj(x10)
acc2 = z20*cnj(x20)
acc3 = z30*cnj(x30)

Parameters

Input/OutputType Comments
return v4cacc48 Returned accumulation vector (4 x cint48 lanes)
xbuff v32cint16Input buffer of 32 elements of type cint16
xstart int Starting position offset applied to all lanes of input from X buffer.
xoffsets unsigned int 4b offset for each lane, applied to the x buffer. LSB apply to first lane
zbuff v4cint32Input buffer of 4 elements of type cint32
zstart int Starting position offset applied to all lanes for input from Z buffer. This must be a compile time constant. Only the 4 LSB of the argument are used.
zoffsetsunsigned int 4b offset for each lane, applied to input from Z buffer. LSB apply to first lane
Note
  • For more information on how data selection works from the buffers go here. The data buffer and coefficient buffer in this intrinsic use the general scheme.
  • Parameter 'zstart' must be a compile time constant.
v4cacc48 mul4_cn ( v16cint16  xbuff,
int  xstart,
unsigned int  xoffsets,
v4cint32  zbuff,
int  zstart,
unsigned int  zoffsets 
)

Complex multiply intrinsic function with x buffer conjugation using small X input buffer.

acc0 = z00*cnj(x00)
acc1 = z10*cnj(x10)
acc2 = z20*cnj(x20)
acc3 = z30*cnj(x30)

Parameters

Input/OutputType Comments
return v4cacc48 Returned accumulation vector (4 x cint48 lanes)
xbuff v16cint16Input buffer of 16 elements of type cint16
xstart int Starting position offset applied to all lanes of input from X buffer.
xoffsets unsigned int 4b offset for each lane, applied to the x buffer. LSB apply to first lane
zbuff v4cint32Input buffer of 4 elements of type cint32
zstart int Starting position offset applied to all lanes for input from Z buffer. This must be a compile time constant. Only the 4 LSB of the argument are used.
zoffsetsunsigned int 4b offset for each lane, applied to input from Z buffer. LSB apply to first lane
Note
  • For more information on how data selection works from the buffers go here. The data buffer and coefficient buffer in this intrinsic use the general scheme.
  • Parameter 'zstart' must be a compile time constant.
v4cacc48 negmul4_cn ( v32cint16  xbuff,
int  xstart,
unsigned int  xoffsets,
v4cint32  zbuff,
int  zstart,
unsigned int  zoffsets 
)

Complex multiply-negate intrinsic function with x buffer conjugation .

acc0 = -( z00*cnj(x00) )
acc1 = -( z10*cnj(x10) )
acc2 = -( z20*cnj(x20) )
acc3 = -( z30*cnj(x30) )

Parameters

Input/OutputType Comments
return v4cacc48 Returned accumulation vector (4 x cint48 lanes)
xbuff v32cint16Input buffer of 32 elements of type cint16
xstart int Starting position offset applied to all lanes of input from X buffer.
xoffsets unsigned int 4b offset for each lane, applied to the x buffer. LSB apply to first lane
zbuff v4cint32Input buffer of 4 elements of type cint32
zstart int Starting position offset applied to all lanes for input from Z buffer. This must be a compile time constant. Only the 4 LSB of the argument are used.
zoffsetsunsigned int 4b offset for each lane, applied to input from Z buffer. LSB apply to first lane
Note
  • For more information on how data selection works from the buffers go here. The data buffer and coefficient buffer in this intrinsic use the general scheme.
  • Parameter 'zstart' must be a compile time constant.
v4cacc48 negmul4_cn ( v16cint16  xbuff,
int  xstart,
unsigned int  xoffsets,
v4cint32  zbuff,
int  zstart,
unsigned int  zoffsets 
)

Complex multiply-negate intrinsic function with x buffer conjugation using small X input buffer.

acc0 = -( z00*cnj(x00) )
acc1 = -( z10*cnj(x10) )
acc2 = -( z20*cnj(x20) )
acc3 = -( z30*cnj(x30) )

Parameters

Input/OutputType Comments
return v4cacc48 Returned accumulation vector (4 x cint48 lanes)
xbuff v16cint16Input buffer of 16 elements of type cint16
xstart int Starting position offset applied to all lanes of input from X buffer.
xoffsets unsigned int 4b offset for each lane, applied to the x buffer. LSB apply to first lane
zbuff v4cint32Input buffer of 4 elements of type cint32
zstart int Starting position offset applied to all lanes for input from Z buffer. This must be a compile time constant. Only the 4 LSB of the argument are used.
zoffsetsunsigned int 4b offset for each lane, applied to input from Z buffer. LSB apply to first lane
Note
  • For more information on how data selection works from the buffers go here. The data buffer and coefficient buffer in this intrinsic use the general scheme.
  • Parameter 'zstart' must be a compile time constant.