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Contiguous load and replicate four doublewords (immediate index).
Load four contiguous doublewords 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 four 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 | 1 | 1 | 0 | 1 | 0 | imm4 | 0 | 0 | 1 | Pg | Rn | Zt |
if !HaveSVEFP64MatMulExt() then UNDEFINED; integer t = UInt(Zt); integer n = UInt(Rn); integer g = UInt(Pg); integer esize = 64; 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. |
CheckSVEEnabledCheckSVEEnabled();
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();
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
CheckSPAlignment();
if HaveMTEExt() then() then SetNotTagCheckedInstruction(TRUE);
base = SetTagCheckedInstruction(FALSE);
base = SP[];
else
if HaveMTEExt() then() then SetNotTagCheckedInstruction(FALSE);
base = SetTagCheckedInstruction(TRUE);
base = X[n];
addr = base + offset * 32;
for e = 0 to elements-1
if ElemP[mask, e, esize] == '1' then if
ElemP[mask, e, esize] == '1' then
Elem[result, e, esize] = Mem[addr, mbytes, AccType_NORMAL];
else
Elem[result, e, esize] = Zeros();
addr = addr + mbytes;
Z[t] = addr = addr + mbytes; Z[t] = ZeroExtend(Replicate(result, VL DIV 256), VL(result, VL DIV 256), VL););
Internal version only: isa v31.05bv31.04, AdvSIMD v29.02, pseudocode v2019-12_rc3_1v2019-09_rc2_1, sve v2019-12_rc3v2019-09_rc3
; Build timestamp: 2019-12-13T112019-09-27T17:0228
Copyright © 2010-2019 Arm Limited or its affiliates. All rights reserved. This document is Non-Confidential.
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