REV (predicate)

Reverse all elements in a predicate

Reverse the order of all elements in the source predicate and place in the destination predicate. This instruction is unpredicated.

313029282726252423222120191817161514131211109876543210
00000101size1101000100000Pn0Pd

REV <Pd>.<T>, <Pn>.<T>

if !HaveSVE() && !HaveSME() then UNDEFINED; constant integer esize = 8 << UInt(size); integer n = UInt(Pn); integer d = UInt(Pd);

Assembler Symbols

<Pd>

Is the name of the destination scalable predicate register, encoded in the "Pd" field.

<T>

Is the size specifier, encoded in size:

size <T>
00 B
01 H
10 S
11 D
<Pn>

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

Operation

CheckSVEEnabled(); constant integer VL = CurrentVL; constant integer PL = VL DIV 8; bits(PL) operand = P[n, PL]; bits(PL) result = Reverse(operand, esize DIV 8); P[d, PL] = result;

Operational information

If FEAT_SVE2 is implemented or FEAT_SME is implemented, then when PSTATE.DIT is 1:


Internal version only: isa v33.53, AdvSIMD v29.11, pseudocode v2022-09_rel, sve v2022-09_rel ; Build timestamp: 2022-09-30T16:37

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