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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

SVE

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

if !HaveSVE() then UNDEFINED;
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();
bits(PL) operand = P[n];
bits(PL) result = Reverse(operand, esize DIV 8);
P[d] = result;