Zero a list of 64-bit element ZA tiles
Zeroes all bytes within each of the up to eight listed 64-bit element tiles named ZA0.D to ZA7.D, leaving the other 64-bit element tiles unmodified.
This instruction does not require the PE to be in Streaming SVE mode, and it is expected that this instruction will not experience a significant slowdown due to contention with other PEs that are executing in Streaming SVE mode.
For programmer convenience an assembler must also accept the names of 32-bit, 16-bit, and 8-bit element tiles which are converted into the corresponding set of 64-bit element tiles.
In accordance with the architecturally defined mapping between different element size tiles:
The preferred disassembly of this instruction uses the shortest list of tile names that represent the encoded immediate mask.
For example:
| 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 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | imm8 | |||||||
ZERO { <mask> }
if !HaveSME() then UNDEFINED; bits(8) mask = imm8; constant integer esize = 64;
| <mask> |
Is a list of up to eight 64-bit element tile names separated by commas, encoded in the "imm8" field. |
CheckSMEAndZAEnabled(); constant integer SVL = CurrentSVL; constant integer dim = SVL DIV esize; bits(dim*dim*esize) result = Zeros(dim*dim*esize); if HaveTME() && TSTATE.depth > 0 then FailTransaction(TMFailure_ERR, FALSE); for i = 0 to 7 if mask<i> == '1' then ZAtile[i, esize, dim*dim*esize] = result;
If PSTATE.DIT is 1:
Internal version only: aarchmrs v2023-12_rel, pseudocode v2023-12_rel, sve v2023-12_rel ; Build timestamp: 2023-12-15T16:46
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