UMINV

Unsigned minimum reduction to scalar

This instruction performs an unsigned minimum horizontally across all lanes of a vector, and places the result in the SIMD&FP scalar destination register. Inactive elements in the source vector are treated as the maximum unsigned integer for the element size.

SVE class

(FEAT_SVE || FEAT_SME)

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	0	size		0	0	1	0	1	1	0	0	1	Pg			Zn					Vd
														op	U

Encoding

UMINV <V><d>, <Pg>, <Zn>.<T>

Decode

if !IsFeatureImplemented(FEAT_SVE) && !IsFeatureImplemented(FEAT_SME) then EndOfDecode(Decode_UNDEF); constant integer esize = 8 << UInt(size); constant integer g = UInt(Pg); constant integer n = UInt(Zn); constant integer d = UInt(Vd); constant boolean unsigned = TRUE;

Assembler Symbols

<V>

Is a width specifier, encoded in size:

size	<V>
00	B
01	H
10	S
11	D

<d>	Is the number [0-31] of the destination SIMD&FP register, encoded in the "Vd" field.

<Pg>	Is the name of the governing scalable predicate register P0-P7, encoded in the "Pg" field.

<Zn>	Is the name of the source scalable vector register, encoded in the "Zn" field.

<T>

Is the size specifier, encoded in size:

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

Operation

CheckSVEEnabled(); constant integer VL = CurrentVL; constant integer PL = VL DIV 8; constant integer elements = VL DIV esize; constant bits(PL) mask = P[g, PL]; constant bits(VL) operand = if AnyActiveElement(mask, esize) then Z[n, VL] else Zeros(VL); integer minimum = if unsigned then (2^esize - 1) else (2^(esize-1) - 1); for e = 0 to elements-1 if ActivePredicateElement(mask, e, esize) then constant bits(esize) opelt = Elem[operand, e, esize]; constant integer element = if unsigned then UInt(opelt) else SInt(opelt); minimum = Min(minimum, element); V[d, esize] = minimum<esize-1:0>;

Operational information

This instruction is a data-independent-time instruction as described in About PSTATE.DIT.

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