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Contiguous load and replicate sixteen halfwords (immediate index).
Load sixteen contiguous halfwords to elements of a 256-bit (octaword) vector from the memory address generated by a 64-bit scalar base address and immediate index that is a multiple of 32 in the range -256 to +224 added to the base address.
Inactive elements will not read Device memory or signal a fault, and are set to zero.
The resulting 256-bit vector is then replicated to fill the destination vector. The instruction requires that the current vector length is at least 256 bits, and if the current vector length is not an integer multiple of 256 bits then the trailing bits in the destination vector are set to zero.
Only the first sixteen predicate elements are used and higher numbered predicate elements are ignored.
ID_AA64ZFR0_EL1.F64MM indicates whether this instruction is implemented.
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 |
1 | 0 | 1 | 0 | 0 | 1 | 0 | 0 | 1 | 0 | 1 | 0 | imm4 | 0 | 0 | 1 | Pg | Rn | Zt | |||||||||||||
msz<1> | msz<0> | ssz |
if !HaveSVEFP64MatMulExt() then UNDEFINED; integer t = UInt(Zt); integer n = UInt(Rn); integer g = UInt(Pg); integer esize = 16; integer offset = SInt(imm4);
<Zt> | Is the name of the scalable vector register to be transferred, encoded in the "Zt" field. |
<Pg> | Is the name of the governing scalable predicate register P0-P7, encoded in the "Pg" field. |
<Xn|SP> | Is the 64-bit name of the general-purpose base register or stack pointer, encoded in the "Rn" field. |
<imm> | Is the optional signed immediate byte offset, a multiple of 32 in the range -256 to 224, defaulting to 0, encoded in the "imm4" field. |
CheckSVEEnabled();
ifCheckSVEEnabled();
if VL < 256 then UNDEFINED;
integer elements = 256 DIV esize;
bits(64) base;
bits(64) addr;
bits(PL) mask = P[g]; // low bits only
bits(256) result;
constant integer mbytes = esize DIV 8;
if n == 31 then VL < 256 then UNDEFINED;
integer elements = 256 DIV esize;
bits(64) base;
bits(64) addr;
bits(PL) mask = P[g]; // low bits only
bits(256) result;
constant integer mbytes = esize DIV 8;
if n == 31 then
if LastActiveElement(mask, esize) >= 0 ||
ConstrainUnpredictableBool(Unpredictable_CHECKSPNONEACTIVE) then
CheckSPAlignment();
if HaveMTEExt() then SetTagCheckedInstruction(FALSE);
base = SP[];
else
if HaveMTEExt() then SetTagCheckedInstruction(TRUE);
base = X[n];
addr = base + offset * 32;
for e = 0 to elements-1
if if ElemP[mask, e, esize] == '1' then ElemP[mask, e, esize] == '1' then
Elem[result, e, esize] = Mem[addr, mbytes, AccType_NORMAL];
else
Elem[result, e, esize] = Zeros();
addr = addr + mbytes; addr = addr + mbytes;
Z[t] =
Z[t] = ZeroExtend(Replicate(result, VL DIV 256), VL);(result, VL DIV 256), VL);
Internal version only: isa v32.03v31.05b, AdvSIMD v29.02, pseudocode v2020-03v2019-12_rc3_1, sve v2020-03_rc1v2019-12_rc3
; Build timestamp: 2020-04-15T132019-12-13T11:3302
Copyright © 2010-20202010-2019 Arm Limited or its affiliates. All rights reserved.
This document is Non-Confidential.
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