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SMAXV

Signed maximum reduction to scalar.

Signed maximum horizontally across all lanes of a vector, and place the result in the SIMD&FP scalar destination register. Inactive elements in the source vector are treated as the minimum signed integer for the element size.

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00000100size001000001PgZnVd

SVE

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

if !HaveSVE() then UNDEFINED;
integer esize = 8 << UInt(size);
integer g = UInt(Pg);
integer n = UInt(Zn);
integer d = UInt(Vd);
boolean unsigned = FALSE;

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();
integer elements = VL DIV esize;
bits(PL) mask = P[g];
bits(VL) operand = Z[n];
integer maximum = if unsigned then 0 else -(2^(esize-1));

for e = 0 to elements-1
    if ElemP[mask, e, esize] == '1' then
        integer element = Int(Elem[operand, e, esize], unsigned);
        maximum = Max(maximum, element);

V[d] = maximum<esize-1:0>;