fmaxnm

FMAXNM <Zdn>.<T>, <Pg>/M, <Zdn>.<T>, <Zm>.<T>

Predicated Floating-point Max Number.

Pseudocode Operation

No pseudocode available.

Encoding

Binary Layout
01100101
31:24
size
23:22
00
21:20
010
19:17
0
16
100
15:13
Pg
12:10
Zm
9:5
Zdn
4:0
 
Format SVE
Opcode 0x65048000
Extension SVE

Related

Other forms of fmaxnm

  • fmaxnm Floating-Point Max Number (Scalar)

More in SVE

Reference

View in Arm A64 ISA Reference ↗ Arm A64 ISA

Instruction Forms

Encoding Instruction ISA Bit pattern
0x0E400400 FMAXNM <Vd>.<T>, <Vn>.<T>, <Vm>.<T> A64 0 | Q | 0 | 01110 | 0 | 10 | Rm | 00 | 000 | 1 | Rn | Rd
0x0E20C400 FMAXNM <Vd>.<T>, <Vn>.<T>, <Vm>.<T> A64 0 | Q | 0 | 01110 | 0 | sz | 1 | Rm | 11000 | 1 | Rn | Rd
0x1EE06800 FMAXNM <Hd>, <Hn>, <Hm> A64 0 | 0 | 0 | 11110 | 11 | 1 | Rm | 01 | 10 | 10 | Rn | Rd
0x1E206800 FMAXNM <Sd>, <Sn>, <Sm> A64 0 | 0 | 0 | 11110 | 00 | 1 | Rm | 01 | 10 | 10 | Rn | Rd
0x1E606800 FMAXNM <Dd>, <Dn>, <Dm> A64 0 | 0 | 0 | 11110 | 01 | 1 | Rm | 01 | 10 | 10 | Rn | Rd
0xC120A120 FMAXNM { <Zdn1>.<T>-<Zdn2>.<T> }, { <Zdn1>.<T>-<Zdn2>.<T> }, <Zm>.<T> A64 11000001 | size | 10 | Zm | 101000 | 0100 | 1 | Zdn | 0
0xC120A920 FMAXNM { <Zdn1>.<T>-<Zdn4>.<T> }, { <Zdn1>.<T>-<Zdn4>.<T> }, <Zm>.<T> A64 11000001 | size | 10 | Zm | 101010 | 0100 | 1 | Zdn | 0 | 0
0xC120B120 FMAXNM { <Zdn1>.<T>-<Zdn2>.<T> }, { <Zdn1>.<T>-<Zdn2>.<T> }, { <Zm1>.<T>-<Zm2>.<T> } A64 11000001 | size | 1 | Zm | 0101100 | 010 | 0 | 1 | Zdn | 0
0xC120B920 FMAXNM { <Zdn1>.<T>-<Zdn4>.<T> }, { <Zdn1>.<T>-<Zdn4>.<T> }, { <Zm1>.<T>-<Zm4>.<T> } A64 11000001 | size | 1 | Zm | 00101110 | 010 | 0 | 1 | Zdn | 0 | 0
0x651C8000 FMAXNM <Zdn>.<T>, <Pg>/M, <Zdn>.<T>, <const> A64 01100101 | size | 011 | 10 | 0 | 100 | Pg | 0000 | i1 | Zdn
0x65048000 FMAXNM <Zdn>.<T>, <Pg>/M, <Zdn>.<T>, <Zm>.<T> A64 01100101 | size | 00 | 010 | 0 | 100 | Pg | Zm | Zdn

Description

Determine the maximum number value of active floating-point elements of the second source vector and corresponding floating-point elements of the first source vector and destructively place the results in the corresponding elements of the first source vector. Regardless of the value of FPCR.AH, the behavior is as follows: Inactive elements in the destination vector register remain unmodified.

Operation

CheckSVEEnabled();
constant integer VL = CurrentVL;
constant integer PL = VL DIV 8;
constant integer elements = VL DIV esize;
bits(PL) mask = P[g, PL];
bits(VL) operand1 = Z[dn, VL];
bits(VL) operand2 = if AnyActiveElement(mask, esize) then Z[m, VL] else Zeros(VL);
bits(VL) result;

for e = 0 to elements-1
    bits(esize) element1 = Elem[operand1, e, esize];
    if ActivePredicateElement(mask, e, esize) then
        bits(esize) element2 = Elem[operand2, e, esize];
        Elem[result, e, esize] = FPMaxNum(element1, element2, FPCR);
    else
        Elem[result, e, esize] = element1;

Z[dn, VL] = result;