SLI

Shift left and insert (immediate)

This instruction shifts each source vector element left by an immediate value, and inserts the result into the corresponding vector element in the destination vector register, merging the shifted bits from each source element with existing bits in each destination vector element. The immediate shift amount is an unsigned value in the range 0 to number of bits per element minus 1. This instruction is unpredicated.

SVE2 class

(FEAT_SVE2 || 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	1	0	0	0	1	0	1	tszh		0	tszl		imm3			1	1	1	1	0	1	Zn					Zd
																					op

Encoding

SLI <Zd>.<T>, <Zn>.<T>, #<const>

Decode

if !IsFeatureImplemented(FEAT_SVE2) && !IsFeatureImplemented(FEAT_SME) then EndOfDecode(Decode_UNDEF); end; let tsize : bits(4) = tszh::tszl; if tsize == '0000' then EndOfDecode(Decode_UNDEF); end; let esize : integer{} = 8 << HighestSetBitNZ(tsize); let n : integer = UInt(Zn); let d : integer = UInt(Zd); let shift : integer = UInt(tsize::imm3) - esize;

Assembler Symbols

<Zd>	Is the name of the destination scalable vector register, encoded in the "Zd" field.

<T>

Is the size specifier, encoded in (tszh :: tszl):

tszh	tszl	<T>
00	00	RESERVED
00	01	B
00	1x	H
01	xx	S
1x	xx	D

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

<const>

Is the immediate shift amount, in the range 0 to number of bits per element minus 1, encoded in "tszh:tszl:imm3".

Operation

CheckSVEEnabled(); let VL : integer{} = CurrentVL(); let elements : integer = VL DIV esize; let operand : bits(VL) = Z{}(n); var result : bits(VL) = Z{}(d); for e = 0 to elements-1 do let element1 : bits(esize) = result[e*:esize]; let element2 : bits(esize) = operand[e*:esize]; let mask : bits(esize) = LSL(Ones{esize}, shift); let shiftedval : bits(esize) = LSL(element2, shift); result[e*:esize] = (element1 AND (NOT mask)) OR shiftedval; end; Z{VL}(d) = result;

Operational information

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

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