_XDXform4dV (Windows CE 5.0)
Multiplies a four-dimensional vector by a 4x4 matrix. This instruction requires that the matrix has been previously loaded into the extended floating-point register bank.
float* _XDXform4dV( float* src, float* dst);
Parameters
- src
[in] Pointer to a three-dimensional source vector. - dst
[out] Pointer to a three-dimensional destination vector.
Return Values
Pointer to the four-dimensional destination vector.
Remarks
The following code shows how to use _XDXform4dV.
#pragma intrinsic(_XDXform4dV, _LoadMatrix)
void print_matrix(float *matrix, float *src, float *dest)
{
int row, col;
printf("Matrix:\t\t\t\tSrc:\tDest:\n");
for (row = 0; row < 4; row++)
{
printf("| ");
for (col = 0; col < 4; col++)
printf("%6.2f", *matrix++);
printf(" |");
printf(" |%6.2f|", *src++);
printf("\t|%10.4f|\n", *dest++);
}
}
void main()
{
int i;
float dest[8];
float src[8] = {1.0, 2.0 ,3.0, 4.0,
5.0, 6.0, 7.0, 8.0};
float matrix[16]={ 1.0, 2.0, 3.0, 4.0,
5.0, 6.0, 7.0, 8.0,
9.0, 10.0, 11.0, 12.0,
13.0, 14.0, 15.0, 16.0};
LoadMatrix(matrix); //Load matrix into XD bank registers
for (i = 0; i < 8; i +=4)
XDXform4dV(src+i, dest+i); //[matrix]x[src[i]] --> dest[i]
print_matrix(matrix, src, dest);
printf("\n");
print_matrix(matrix, src+4, dest+4);
}
Output
Matrix: Src: Dest:
| 1.00 2.00 3.00 4.00 | | 1.00 | | 30.0000|
| 5.00 6.00 7.00 8.00 | | 2.00 | | 70.0000|
| 9.00 10.00 11.00 12.00 | | 3.00 | | 110.0000|
| 13.00 14.00 15.00 16.00 | | 4.00 | | 150.0000|
Matrix: Src: Dest:
| 1.00 2.00 3.00 4.00 | | 5.00| | 70.0000|
| 5.00 6.00 7.00 8.00 | | 6.00| | 174.0000|
| 9.00 10.00 11.00 12.00 | | 7.00| | 278.0000|
| 13.00 14.00 15.00 16.00 | | 8.00| | 382.0000|
Requirements
Header: shintr.h.
See Also
Intrinsic Functions for Renesas Microprocessors | _Xform3dV | _Xform4dV | _LoadMatrix | _SaveMatrix
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