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Dynamic Z buffer conjugation

Overview

32 bit real by 32 bit complex using Dynamic Z buffer conjugation

Functions

v2cacc80 lmac2 (v2cacc80 acc, v32int32 xbuff, int xstart, unsigned int xoffsets, int xstep, v4cint32 zbuff, int zstart, unsigned int zoffsets, int zstep, bool zconj)
 Complex multiply-accumulate intrinsic function with dynamic z buffer conjugation .
 
v2cacc80 lmac2 (v2cacc80 acc, v16int32 xbuff, int xstart, unsigned int xoffsets, int xstep, v4cint32 zbuff, int zstart, unsigned int zoffsets, int zstep, bool zconj)
 Complex multiply-accumulate intrinsic function with dynamic z buffer conjugation using small X input buffer.
 
v4cacc80 lmac4 (v4cacc80 acc, v32int32 xbuff, int xstart, unsigned int xoffsets, v4cint32 zbuff, int zstart, unsigned int zoffsets, bool zconj)
 Complex multiply-accumulate intrinsic function with dynamic z buffer conjugation .
 
v4cacc80 lmac4 (v4cacc80 acc, v16int32 xbuff, int xstart, unsigned int xoffsets, v4cint32 zbuff, int zstart, unsigned int zoffsets, bool zconj)
 Complex multiply-accumulate intrinsic function with dynamic z buffer conjugation using small X input buffer.
 
v2cacc80 lmsc2 (v2cacc80 acc, v32int32 xbuff, int xstart, unsigned int xoffsets, int xstep, v4cint32 zbuff, int zstart, unsigned int zoffsets, int zstep, bool zconj)
 Complex multiply-subtract intrinsic function with dynamic z buffer conjugation .
 
v2cacc80 lmsc2 (v2cacc80 acc, v16int32 xbuff, int xstart, unsigned int xoffsets, int xstep, v4cint32 zbuff, int zstart, unsigned int zoffsets, int zstep, bool zconj)
 Complex multiply-subtract intrinsic function with dynamic z buffer conjugation using small X input buffer.
 
v4cacc80 lmsc4 (v4cacc80 acc, v32int32 xbuff, int xstart, unsigned int xoffsets, v4cint32 zbuff, int zstart, unsigned int zoffsets, bool zconj)
 Complex multiply-subtract intrinsic function with dynamic z buffer conjugation .
 
v4cacc80 lmsc4 (v4cacc80 acc, v16int32 xbuff, int xstart, unsigned int xoffsets, v4cint32 zbuff, int zstart, unsigned int zoffsets, bool zconj)
 Complex multiply-subtract intrinsic function with dynamic z buffer conjugation using small X input buffer.
 
v2cacc80 lmul2 (v32int32 xbuff, int xstart, unsigned int xoffsets, int xstep, v4cint32 zbuff, int zstart, unsigned int zoffsets, int zstep, bool zconj)
 Complex multiply intrinsic function with dynamic z buffer conjugation .
 
v2cacc80 lmul2 (v16int32 xbuff, int xstart, unsigned int xoffsets, int xstep, v4cint32 zbuff, int zstart, unsigned int zoffsets, int zstep, bool zconj)
 Complex multiply intrinsic function with dynamic z buffer conjugation using small X input buffer.
 
v4cacc80 lmul4 (v32int32 xbuff, int xstart, unsigned int xoffsets, v4cint32 zbuff, int zstart, unsigned int zoffsets, bool zconj)
 Complex multiply intrinsic function with dynamic z buffer conjugation .
 
v4cacc80 lmul4 (v16int32 xbuff, int xstart, unsigned int xoffsets, v4cint32 zbuff, int zstart, unsigned int zoffsets, bool zconj)
 Complex multiply intrinsic function with dynamic z buffer conjugation using small X input buffer.
 
v2cacc80 lnegmul2 (v32int32 xbuff, int xstart, unsigned int xoffsets, int xstep, v4cint32 zbuff, int zstart, unsigned int zoffsets, int zstep, bool zconj)
 Complex multiply-negate intrinsic function with dynamic z buffer conjugation .
 
v2cacc80 lnegmul2 (v16int32 xbuff, int xstart, unsigned int xoffsets, int xstep, v4cint32 zbuff, int zstart, unsigned int zoffsets, int zstep, bool zconj)
 Complex multiply-negate intrinsic function with dynamic z buffer conjugation using small X input buffer.
 
v4cacc80 lnegmul4 (v32int32 xbuff, int xstart, unsigned int xoffsets, v4cint32 zbuff, int zstart, unsigned int zoffsets, bool zconj)
 Complex multiply-negate intrinsic function with dynamic z buffer conjugation .
 
v4cacc80 lnegmul4 (v16int32 xbuff, int xstart, unsigned int xoffsets, v4cint32 zbuff, int zstart, unsigned int zoffsets, bool zconj)
 Complex multiply-negate intrinsic function with dynamic z buffer conjugation using small X input buffer.
 

Function Documentation

v2cacc80 lmac2 ( v2cacc80  acc,
v32int32  xbuff,
int  xstart,
unsigned int  xoffsets,
int  xstep,
v4cint32  zbuff,
int  zstart,
unsigned int  zoffsets,
int  zstep,
bool  zconj 
)

Complex multiply-accumulate intrinsic function with dynamic z buffer conjugation .

acc0 += z00*x00 + z01*x01
acc1 += z10*x10 + z11*x11
Returns
Returned accumulation vector (2 x cint80 lanes)
Parameters
accIncoming accumulation vector (2 x cint80 lanes)
xbuffInput buffer of 32 elements of type int32
xstartStarting position offset applied to all lanes of input from X buffer.
xoffsets4b offset for each lane, applied to the x buffer. LSB apply to first lane
xstepStep between each column for selection in the xbuffer.
zbuffInput buffer of 4 elements of type cint32
zstartStarting 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.
zoffsets4b offset for each lane, applied to input from Z buffer. LSB apply to first lane
zstepStep between each column for selection in the zbuffer.
zconjSelector for conjugation in Z buffer
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.
v2cacc80 lmac2 ( v2cacc80  acc,
v16int32  xbuff,
int  xstart,
unsigned int  xoffsets,
int  xstep,
v4cint32  zbuff,
int  zstart,
unsigned int  zoffsets,
int  zstep,
bool  zconj 
)

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

acc0 += z00*x00 + z01*x01
acc1 += z10*x10 + z11*x11
Returns
Returned accumulation vector (2 x cint80 lanes)
Parameters
accIncoming accumulation vector (2 x cint80 lanes)
xbuffInput buffer of 16 elements of type int32
xstartStarting position offset applied to all lanes of input from X buffer.
xoffsets4b offset for each lane, applied to the x buffer. LSB apply to first lane
xstepStep between each column for selection in the xbuffer.
zbuffInput buffer of 4 elements of type cint32
zstartStarting 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.
zoffsets4b offset for each lane, applied to input from Z buffer. LSB apply to first lane
zstepStep between each column for selection in the zbuffer.
zconjSelector for conjugation in Z buffer
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 ( v4cacc80  acc,
v32int32  xbuff,
int  xstart,
unsigned int  xoffsets,
v4cint32  zbuff,
int  zstart,
unsigned int  zoffsets,
bool  zconj 
)

Complex multiply-accumulate intrinsic function with dynamic z buffer conjugation .

acc0 += z00*x00
acc1 += z10*x10
acc2 += z20*x20
acc3 += z30*x30
Returns
Returned accumulation vector (4 x cint80 lanes)
Parameters
accIncoming accumulation vector (4 x cint80 lanes)
xbuffInput buffer of 32 elements of type int32
xstartStarting position offset applied to all lanes of input from X buffer.
xoffsets4b offset for each lane, applied to the x buffer. LSB apply to first lane
zbuffInput buffer of 4 elements of type cint32
zstartStarting 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.
zoffsets4b offset for each lane, applied to input from Z buffer. LSB apply to first lane
zconjSelector for conjugation in Z buffer
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 ( v4cacc80  acc,
v16int32  xbuff,
int  xstart,
unsigned int  xoffsets,
v4cint32  zbuff,
int  zstart,
unsigned int  zoffsets,
bool  zconj 
)

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

acc0 += z00*x00
acc1 += z10*x10
acc2 += z20*x20
acc3 += z30*x30
Returns
Returned accumulation vector (4 x cint80 lanes)
Parameters
accIncoming accumulation vector (4 x cint80 lanes)
xbuffInput buffer of 16 elements of type int32
xstartStarting position offset applied to all lanes of input from X buffer.
xoffsets4b offset for each lane, applied to the x buffer. LSB apply to first lane
zbuffInput buffer of 4 elements of type cint32
zstartStarting 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.
zoffsets4b offset for each lane, applied to input from Z buffer. LSB apply to first lane
zconjSelector for conjugation in Z buffer
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.
v2cacc80 lmsc2 ( v2cacc80  acc,
v32int32  xbuff,
int  xstart,
unsigned int  xoffsets,
int  xstep,
v4cint32  zbuff,
int  zstart,
unsigned int  zoffsets,
int  zstep,
bool  zconj 
)

Complex multiply-subtract intrinsic function with dynamic z buffer conjugation .

acc0 -= z00*x00 + z01*x01
acc1 -= z10*x10 + z11*x11
Returns
Returned accumulation vector (2 x cint80 lanes)
Parameters
accIncoming accumulation vector (2 x cint80 lanes)
xbuffInput buffer of 32 elements of type int32
xstartStarting position offset applied to all lanes of input from X buffer.
xoffsets4b offset for each lane, applied to the x buffer. LSB apply to first lane
xstepStep between each column for selection in the xbuffer.
zbuffInput buffer of 4 elements of type cint32
zstartStarting 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.
zoffsets4b offset for each lane, applied to input from Z buffer. LSB apply to first lane
zstepStep between each column for selection in the zbuffer.
zconjSelector for conjugation in Z buffer
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.
v2cacc80 lmsc2 ( v2cacc80  acc,
v16int32  xbuff,
int  xstart,
unsigned int  xoffsets,
int  xstep,
v4cint32  zbuff,
int  zstart,
unsigned int  zoffsets,
int  zstep,
bool  zconj 
)

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

acc0 -= z00*x00 + z01*x01
acc1 -= z10*x10 + z11*x11
Returns
Returned accumulation vector (2 x cint80 lanes)
Parameters
accIncoming accumulation vector (2 x cint80 lanes)
xbuffInput buffer of 16 elements of type int32
xstartStarting position offset applied to all lanes of input from X buffer.
xoffsets4b offset for each lane, applied to the x buffer. LSB apply to first lane
xstepStep between each column for selection in the xbuffer.
zbuffInput buffer of 4 elements of type cint32
zstartStarting 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.
zoffsets4b offset for each lane, applied to input from Z buffer. LSB apply to first lane
zstepStep between each column for selection in the zbuffer.
zconjSelector for conjugation in Z buffer
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 ( v4cacc80  acc,
v32int32  xbuff,
int  xstart,
unsigned int  xoffsets,
v4cint32  zbuff,
int  zstart,
unsigned int  zoffsets,
bool  zconj 
)

Complex multiply-subtract intrinsic function with dynamic z buffer conjugation .

acc0 -= z00*x00
acc1 -= z10*x10
acc2 -= z20*x20
acc3 -= z30*x30
Returns
Returned accumulation vector (4 x cint80 lanes)
Parameters
accIncoming accumulation vector (4 x cint80 lanes)
xbuffInput buffer of 32 elements of type int32
xstartStarting position offset applied to all lanes of input from X buffer.
xoffsets4b offset for each lane, applied to the x buffer. LSB apply to first lane
zbuffInput buffer of 4 elements of type cint32
zstartStarting 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.
zoffsets4b offset for each lane, applied to input from Z buffer. LSB apply to first lane
zconjSelector for conjugation in Z buffer
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 ( v4cacc80  acc,
v16int32  xbuff,
int  xstart,
unsigned int  xoffsets,
v4cint32  zbuff,
int  zstart,
unsigned int  zoffsets,
bool  zconj 
)

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

acc0 -= z00*x00
acc1 -= z10*x10
acc2 -= z20*x20
acc3 -= z30*x30
Returns
Returned accumulation vector (4 x cint80 lanes)
Parameters
accIncoming accumulation vector (4 x cint80 lanes)
xbuffInput buffer of 16 elements of type int32
xstartStarting position offset applied to all lanes of input from X buffer.
xoffsets4b offset for each lane, applied to the x buffer. LSB apply to first lane
zbuffInput buffer of 4 elements of type cint32
zstartStarting 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.
zoffsets4b offset for each lane, applied to input from Z buffer. LSB apply to first lane
zconjSelector for conjugation in Z buffer
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.
v2cacc80 lmul2 ( v32int32  xbuff,
int  xstart,
unsigned int  xoffsets,
int  xstep,
v4cint32  zbuff,
int  zstart,
unsigned int  zoffsets,
int  zstep,
bool  zconj 
)

Complex multiply intrinsic function with dynamic z buffer conjugation .

acc0 = z00*x00 + z01*x01
acc1 = z10*x10 + z11*x11
Returns
Returned accumulation vector (2 x cint80 lanes)
Parameters
xbuffInput buffer of 32 elements of type int32
xstartStarting position offset applied to all lanes of input from X buffer.
xoffsets4b offset for each lane, applied to the x buffer. LSB apply to first lane
xstepStep between each column for selection in the xbuffer.
zbuffInput buffer of 4 elements of type cint32
zstartStarting 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.
zoffsets4b offset for each lane, applied to input from Z buffer. LSB apply to first lane
zstepStep between each column for selection in the zbuffer.
zconjSelector for conjugation in Z buffer
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.
v2cacc80 lmul2 ( v16int32  xbuff,
int  xstart,
unsigned int  xoffsets,
int  xstep,
v4cint32  zbuff,
int  zstart,
unsigned int  zoffsets,
int  zstep,
bool  zconj 
)

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

acc0 = z00*x00 + z01*x01
acc1 = z10*x10 + z11*x11
Returns
Returned accumulation vector (2 x cint80 lanes)
Parameters
xbuffInput buffer of 16 elements of type int32
xstartStarting position offset applied to all lanes of input from X buffer.
xoffsets4b offset for each lane, applied to the x buffer. LSB apply to first lane
xstepStep between each column for selection in the xbuffer.
zbuffInput buffer of 4 elements of type cint32
zstartStarting 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.
zoffsets4b offset for each lane, applied to input from Z buffer. LSB apply to first lane
zstepStep between each column for selection in the zbuffer.
zconjSelector for conjugation in Z buffer
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 ( v32int32  xbuff,
int  xstart,
unsigned int  xoffsets,
v4cint32  zbuff,
int  zstart,
unsigned int  zoffsets,
bool  zconj 
)

Complex multiply intrinsic function with dynamic z buffer conjugation .

acc0 = z00*x00
acc1 = z10*x10
acc2 = z20*x20
acc3 = z30*x30
Returns
Returned accumulation vector (4 x cint80 lanes)
Parameters
xbuffInput buffer of 32 elements of type int32
xstartStarting position offset applied to all lanes of input from X buffer.
xoffsets4b offset for each lane, applied to the x buffer. LSB apply to first lane
zbuffInput buffer of 4 elements of type cint32
zstartStarting 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.
zoffsets4b offset for each lane, applied to input from Z buffer. LSB apply to first lane
zconjSelector for conjugation in Z buffer
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 ( v16int32  xbuff,
int  xstart,
unsigned int  xoffsets,
v4cint32  zbuff,
int  zstart,
unsigned int  zoffsets,
bool  zconj 
)

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

acc0 = z00*x00
acc1 = z10*x10
acc2 = z20*x20
acc3 = z30*x30
Returns
Returned accumulation vector (4 x cint80 lanes)
Parameters
xbuffInput buffer of 16 elements of type int32
xstartStarting position offset applied to all lanes of input from X buffer.
xoffsets4b offset for each lane, applied to the x buffer. LSB apply to first lane
zbuffInput buffer of 4 elements of type cint32
zstartStarting 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.
zoffsets4b offset for each lane, applied to input from Z buffer. LSB apply to first lane
zconjSelector for conjugation in Z buffer
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.
v2cacc80 lnegmul2 ( v32int32  xbuff,
int  xstart,
unsigned int  xoffsets,
int  xstep,
v4cint32  zbuff,
int  zstart,
unsigned int  zoffsets,
int  zstep,
bool  zconj 
)

Complex multiply-negate intrinsic function with dynamic z buffer conjugation .

acc0 = -( z00*x00 + z01*x01 )
acc1 = -( z10*x10 + z11*x11 )
Returns
Returned accumulation vector (2 x cint80 lanes)
Parameters
xbuffInput buffer of 32 elements of type int32
xstartStarting position offset applied to all lanes of input from X buffer.
xoffsets4b offset for each lane, applied to the x buffer. LSB apply to first lane
xstepStep between each column for selection in the xbuffer.
zbuffInput buffer of 4 elements of type cint32
zstartStarting 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.
zoffsets4b offset for each lane, applied to input from Z buffer. LSB apply to first lane
zstepStep between each column for selection in the zbuffer.
zconjSelector for conjugation in Z buffer
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.
v2cacc80 lnegmul2 ( v16int32  xbuff,
int  xstart,
unsigned int  xoffsets,
int  xstep,
v4cint32  zbuff,
int  zstart,
unsigned int  zoffsets,
int  zstep,
bool  zconj 
)

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

acc0 = -( z00*x00 + z01*x01 )
acc1 = -( z10*x10 + z11*x11 )
Returns
Returned accumulation vector (2 x cint80 lanes)
Parameters
xbuffInput buffer of 16 elements of type int32
xstartStarting position offset applied to all lanes of input from X buffer.
xoffsets4b offset for each lane, applied to the x buffer. LSB apply to first lane
xstepStep between each column for selection in the xbuffer.
zbuffInput buffer of 4 elements of type cint32
zstartStarting 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.
zoffsets4b offset for each lane, applied to input from Z buffer. LSB apply to first lane
zstepStep between each column for selection in the zbuffer.
zconjSelector for conjugation in Z buffer
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 ( v32int32  xbuff,
int  xstart,
unsigned int  xoffsets,
v4cint32  zbuff,
int  zstart,
unsigned int  zoffsets,
bool  zconj 
)

Complex multiply-negate intrinsic function with dynamic z buffer conjugation .

acc0 = -( z00*x00 )
acc1 = -( z10*x10 )
acc2 = -( z20*x20 )
acc3 = -( z30*x30 )
Returns
Returned accumulation vector (4 x cint80 lanes)
Parameters
xbuffInput buffer of 32 elements of type int32
xstartStarting position offset applied to all lanes of input from X buffer.
xoffsets4b offset for each lane, applied to the x buffer. LSB apply to first lane
zbuffInput buffer of 4 elements of type cint32
zstartStarting 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.
zoffsets4b offset for each lane, applied to input from Z buffer. LSB apply to first lane
zconjSelector for conjugation in Z buffer
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 ( v16int32  xbuff,
int  xstart,
unsigned int  xoffsets,
v4cint32  zbuff,
int  zstart,
unsigned int  zoffsets,
bool  zconj 
)

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

acc0 = -( z00*x00 )
acc1 = -( z10*x10 )
acc2 = -( z20*x20 )
acc3 = -( z30*x30 )
Returns
Returned accumulation vector (4 x cint80 lanes)
Parameters
xbuffInput buffer of 16 elements of type int32
xstartStarting position offset applied to all lanes of input from X buffer.
xoffsets4b offset for each lane, applied to the x buffer. LSB apply to first lane
zbuffInput buffer of 4 elements of type cint32
zstartStarting 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.
zoffsets4b offset for each lane, applied to input from Z buffer. LSB apply to first lane
zconjSelector for conjugation in Z buffer
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.