Arm® A64 Instruction Set Architecture: Armv8, for Armv8-A architecture profile | REV (predicate): Reverse all elements in a predicate.

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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.

31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
0	0	0	0	0	1	0	1	size		1	1	0	1	0	0	0	1	0	0	0	0	0	Pn				0	Pd

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

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

<T>

Is the size specifier, encoded in size:

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

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

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