Index

UMAX (immediate)

Unsigned Maximum (immediate) determines the unsigned maximum of the source register value and immediate, and writes the result to the destination register.

Integer
(FEAT_CSSC)

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
sf 0 0 1 0 0 0 1 1 1 0 0 0 1 imm8 Rn Rd

32-bit (sf == 0)

UMAX <Wd>, <Wn>, #<uimm>

64-bit (sf == 1)

UMAX <Xd>, <Xn>, #<uimm>

if !IsFeatureImplemented(FEAT_CSSC) then UNDEFINED;
constant integer datasize = 32 << UInt(sf);
integer n = UInt(Rn);
integer d = UInt(Rd);
integer imm = UInt(imm8);

Assembler Symbols

<Wd>

Is the 32-bit name of the general-purpose destination register, encoded in the "Rd" field.
<Wn>

Is the 32-bit name of the general-purpose source register, encoded in the "Rn" field.
<Xd>

Is the 64-bit name of the general-purpose destination register, encoded in the "Rd" field.
<Xn>

Is the 64-bit name of the general-purpose source register, encoded in the "Rn" field.
<uimm>

Is an unsigned immediate, in the range 0 to 255, encoded in the "imm8" field.

Operation

bits(datasize) operand1 = X[n, datasize];
integer result = Max(UInt(operand1), imm);
X[d, datasize] = result<datasize-1:0>;

Operational information

If PSTATE.DIT is 1: