umaxp

UMAXP <Zdn>.<T>, <Pg>/M, <Zdn>.<T>, <Zm>.<T>

Unsigned Maximum Pairwise.

Pseudocode Operation

No pseudocode available.

Encoding

Binary Layout
01000100
31:24
size
23:22
010
21:19
1
18
0
17
1
16
101
15:13
Pg
12:10
Zm
9:5
Zdn
4:0
 
Format SVE2
Opcode 0x4415A000
Extension SVE2

Related

More in SVE2

Reference

View in Arm A64 ISA Reference ↗ Arm A64 ISA

Instruction Forms

Encoding Instruction ISA Bit pattern
0x2E20A400 UMAXP <Vd>.<T>, <Vn>.<T>, <Vm>.<T> A64 0 | Q | 1 | 01110 | size | 1 | Rm | 1010 | 0 | 1 | Rn | Rd
0x4415A000 UMAXP <Zdn>.<T>, <Pg>/M, <Zdn>.<T>, <Zm>.<T> A64 01000100 | size | 010 | 1 | 0 | 1 | 101 | Pg | Zm | Zdn

Description

Compute the maximum value of each pair of adjacent unsigned integer elements within each source vector, and interleave the results from corresponding lanes. The interleaved result values are destructively placed in the first source vector.

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(VL) operand1 = Z[dn, VL];
bits(VL) operand2 = if AnyActiveElement(mask, esize) then Z[m, VL] else Zeros(VL);
bits(VL) result;
integer element1;
integer element2;

for e = 0 to elements-1
    if !ActivePredicateElement(mask, e, esize) then
        Elem[result, e, esize] = Elem[operand1, e, esize];
    else
        if IsEven(e) then
            element1 = UInt(Elem[operand1, e + 0, esize]);
            element2 = UInt(Elem[operand1, e + 1, esize]);
        else
            element1 = UInt(Elem[operand2, e - 1, esize]);
            element2 = UInt(Elem[operand2, e + 0, esize]);
        integer res = Max(element1, element2);
        Elem[result, e, esize] = res<esize-1:0>;

Z[dn, VL] = result;