CNTP

Set scalar to count of true predicate elements.

Counts the number of active and true elements in the source predicate and places the scalar result in the destination general-purpose register. Inactive predicate elements are not counted.

313029282726252423222120191817161514131211109876543210
00100101size10000010Pg0PnRd

SVE

CNTP <Xd>, <Pg>, <Pn>.<T>

if !HaveSVE() then UNDEFINED; integer esize = 8 << UInt(size); integer g = UInt(Pg); integer n = UInt(Pn); integer d = UInt(Rd);

Assembler Symbols

<Xd>

Is the 64-bit name of the destination general-purpose register, encoded in the "Rd" field.

<Pg>

Is the name of the governing scalable predicate register, encoded in the "Pg" field.

<Pn>

Is the name of the source scalable predicate register, encoded in the "Pn" field.

<T> Is the size specifier, encoded in size:
size <T>
00 B
01 H
10 S
11 D

Operation

CheckSVEEnabled(); integer elements = VL DIV esize; bits(PL) mask = P[g]; bits(PL) operand = P[n]; bits(64) sum = Zeros(); for e = 0 to elements-1 if ElemP[mask, e, esize] == '1' && ElemP[operand, e, esize] == '1' then sum = sum + 1; X[d] = sum;

Operational information

If PSTATE.DIT is 1:


Internal version only: isa v31.05b, AdvSIMD v29.02, pseudocode v2019-12_rc3_1, sve v2019-12_rc3 ; Build timestamp: 2019-12-13T11:35

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