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:
* Zeroing the 8-bit element tile name ZA0.B, or the entire array name ZA, is equivalent to zeroing all eight 64-bit element tiles named ZA0.D to ZA7.D.
* Zeroing the 16-bit element tile name ZA0.H is equivalent to zeroing 64-bit element tiles named ZA0.D, ZA2.D, ZA4.D and ZA6.D.
* Zeroing the 16-bit element tile name ZA1.H is equivalent to zeroing 64-bit element tiles named ZA1.D, ZA3.D, ZA5.D and ZA7.D.
* Zeroing the 32-bit element tile name ZA0.S is equivalent to zeroing 64-bit element tiles named ZA0.D and ZA4.D.
* Zeroing the 32-bit element tile name ZA1.S is equivalent to zeroing 64-bit element tiles named ZA1.D and ZA5.D.
* Zeroing the 32-bit element tile name ZA2.S is equivalent to zeroing 64-bit element tiles named ZA2.D and ZA6.D.
* Zeroing the 32-bit element tile name ZA3.S is equivalent to zeroing 64-bit element tiles named ZA3.D and ZA7.D.
The preferred disassembly of this instruction uses the shortest list of tile names that represent the encoded immediate mask.
For example:
* An immediate which encodes 64-bit element tiles ZA0.D, ZA1.D, ZA4.D and ZA5.D is disassembled as {ZA0.S, ZA1.S}.
* An immediate which encodes 64-bit element tiles ZA0.D, ZA2.D, ZA4.D and ZA6.D is disassembled as {ZA0.H}.
* An all-ones immediate is disassembled as {ZA}.
* An all-zeros immediate is disassembled as an empty list { }.
| 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; 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(); integer dim = SVL DIV esize; bits(dim*dim*esize) result = Zeros(); if HaveTME() && TSTATE.depth > 0 then FailTransaction(TMFailure_ERR, FALSE); for i = 0 to 7 if mask<i> == '1' then ZAtile[i, esize] = result;
Internal version only: isa v33.11seprel, AdvSIMD v29.05, pseudocode v2021-09_rel, sve v2021-09_rc3d ; Build timestamp: 2021-10-06T11:41
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