eors

EORS <Pd>.B, <Pg>/Z, <Pn>.B, <Pm>.B

Predicate XOR (Set Flags)

Pseudocode Operation

No pseudocode available.

Encoding

Binary Layout

00100101

31:24

21:20

19:16

15:14

13:10

8:5

3:0

Format SVE

Opcode 0x25404200

Extension SVE

Reference

View in Arm A64 ISA Reference ↗ Arm A64 ISA

Instruction Forms

Encoding	Instruction		ISA		Bit pattern
0x25404200	EORS <Pd>.B, <Pg>/Z, <Pn>.B, <Pm>.B		A64		00100101 \| 0 \| 1 \| 00 \| Pm \| 01 \| Pg \| 1 \| Pn \| 0 \| Pd

Description

Bitwise exclusive OR active elements of the second source predicate with corresponding elements of the first source predicate and place the results in the corresponding elements of the destination predicate. Inactive elements in the destination predicate register are set to zero. 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 = P[g, PL];
bits(PL) operand1 = P[n, PL];
bits(PL) operand2 = P[m, PL];
bits(PL) result;
constant integer psize = esize DIV 8;

for e = 0 to elements-1
    bit element1 = PredicateElement(operand1, e, esize);
    bit element2 = PredicateElement(operand2, e, esize);
    if ActivePredicateElement(mask, e, esize) then
        Elem[result, e, psize] = ZeroExtend(element1 EOR element2, psize);
    else
        Elem[result, e, psize] = ZeroExtend('0', psize);

if setflags then
    PSTATE.<N,Z,C,V> = PredTest(mask, result, esize);
P[d, PL] = result;