SPRUI30H November 2015 – May 2024 DRA745 , DRA746 , DRA750 , DRA756
Clear Bit Field Bounded by Two Register Values
CLR src1, src2, dst
Functional unit = L
32 bit
31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 13 | 12 | 10 | 9 | 7 | 6 | 0 |
x | x | x | x | x | x | x | x | x | x | x | 1 | 0 | 0 | 0 | 1 | dst | src2 | src1 | 0 | 0 | 0 | 0 | 1 | 0 | 0 |
3 | 3 | 3 | opcode |
For src1[9:5] ≥ src1[4:0, the field in src2 as specified by src1[4:0] to src1[9:5] is cleared to all 0s and the resulting value of src2 is written to dst. src2 is left unchanged. src1[4:0] is the LSB of the field and src1[9:5] is the MSB of the field. In other words, src1[4:0] and src1[9:5] represent the beginning and ending bits, respectively, of the field to be cleared to all 0s. The LSB location of src2 is bit 0 and the MSB location of src2 is bit 31.
Valid values of src1[9:5 and src1[4:0] are:
For src1[9:5] < src1[4:0], the result is undefined.
In the following example, src1[4:0] is 15 and src1[9:5] is 23.
CSR[2]EQ = (dst == 0)
dst = src2
for( i = 0; i < 32; i++) {
if ( i >= src1[4:0] && i <= src1[9:5]) dst[i] = 0;
};