whilege
While Greater or Equal (Extended)
Pseudocode Operation
No pseudocode available.
Encoding
Related
More in SVE2
Reference
Instruction Forms
| Encoding | Instruction | ISA | Bit pattern | ||
|---|---|---|---|---|---|
| 0x25200000 | WHILEGE <Pd>.<T>, <R><n>, <R><m> | A64 | 00100101 | size | 1 | Rm | 000 | sf | 0 | 0 | Rn | 0 | Pd | ||
| 0x25204010 | WHILEGE <PNd>.<T>, <Xn>, <Xm>, <vl> | A64 | 00100101 | size | 1 | Rm | 01 | vl | 0 | 0 | 0 | Rn | 1 | 0 | PNd | ||
| 0x25205010 | WHILEGE { <Pd1>.<T>, <Pd2>.<T> }, <Xn>, <Xm> | A64 | 00100101 | size | 1 | Rm | 0101 | 0 | 0 | Rn | 1 | Pd | 0 |
Description
Generate a predicate that starting from the highest numbered element is true while the decrementing value of the first, signed scalar operand is greater than or equal to the second scalar operand and false thereafter down to the lowest numbered element. If the second scalar operand is equal to the minimum signed integer value then a condition which includes an equality test can never fail and the result will be an all-true predicate. The full width of the scalar operands is significant for the purposes of comparison, and the full width first operand is decremented by one for each destination predicate element, irrespective of the predicate result element size. The first general-purpose source register is not itself updated. The predicate result is placed in the predicate destination register. Sets the First (N), None (Z), !Last (C) condition flags based on the predicate result, and the V flag to zero.
Operation
CheckSVEEnabled();
constant integer VL = CurrentVL;
constant integer PL = VL DIV 8;
constant integer elements = VL DIV esize;
bits(PL) mask = Ones(PL);
bits(rsize) operand1 = X[n, rsize];
bits(rsize) operand2 = X[m, rsize];
bits(PL) result;
boolean last = TRUE;
constant integer psize = esize DIV 8;
for e = elements-1 downto 0
boolean cond;
case op of
when Cmp_GT cond = (Int(operand1, unsigned) > Int(operand2, unsigned));
when Cmp_GE cond = (Int(operand1, unsigned) >= Int(operand2, unsigned));
last = last && cond;
bit pbit = if last then '1' else '0';
Elem[result, e, psize] = ZeroExtend(pbit, psize);
operand1 = operand1 - 1;
PSTATE.<N,Z,C,V> = PredTest(mask, result, esize);
P[d, PL] = result;