Increment vector by multiple of predicate constraint element count
This instruction determines the number of active elements implied by the named predicate constraint, multiplies that by an immediate in the range 1 to 16 inclusive, and then uses the result to increment all destination vector elements.
The named predicate constraint limits the number of active elements in a single predicate to:
Unspecified or out of range constraint encodings generate an empty predicate or zero element count rather than Undefined Instruction exception.
It has encodings from 3 classes: Doubleword , Halfword and Word
| 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 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 1 | 1 | 1 | 1 | imm4 | 1 | 1 | 0 | 0 | 0 | 0 | pattern | Zdn | |||||||||||
| size | D | ||||||||||||||||||||||||||||||
if !IsFeatureImplemented(FEAT_SVE) && !IsFeatureImplemented(FEAT_SME) then EndOfDecode(Decode_UNDEF); constant integer esize = 64; constant integer dn = UInt(Zdn); constant bits(5) pat = pattern; constant integer imm = UInt(imm4) + 1;
| 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 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 1 | 1 | 1 | imm4 | 1 | 1 | 0 | 0 | 0 | 0 | pattern | Zdn | |||||||||||
| size | D | ||||||||||||||||||||||||||||||
if !IsFeatureImplemented(FEAT_SVE) && !IsFeatureImplemented(FEAT_SME) then EndOfDecode(Decode_UNDEF); constant integer esize = 16; constant integer dn = UInt(Zdn); constant bits(5) pat = pattern; constant integer imm = UInt(imm4) + 1;
| 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 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 1 | 0 | 1 | 1 | imm4 | 1 | 1 | 0 | 0 | 0 | 0 | pattern | Zdn | |||||||||||
| size | D | ||||||||||||||||||||||||||||||
if !IsFeatureImplemented(FEAT_SVE) && !IsFeatureImplemented(FEAT_SME) then EndOfDecode(Decode_UNDEF); constant integer esize = 32; constant integer dn = UInt(Zdn); constant bits(5) pat = pattern; constant integer imm = UInt(imm4) + 1;
| <Zdn> |
Is the name of the source and destination scalable vector register, encoded in the "Zdn" field. |
| <imm> |
Is the immediate multiplier, in the range 1 to 16, defaulting to 1, encoded in the "imm4" field. |
CheckSVEEnabled(); constant integer VL = CurrentVL; constant integer elements = VL DIV esize; constant integer count = DecodePredCount(pat, esize); constant bits(VL) operand1 = Z[dn, VL]; bits(VL) result; for e = 0 to elements-1 Elem[result, e, esize] = Elem[operand1, e, esize] + (count * imm); Z[dn, VL] = result;
This instruction is a data-independent-time instruction as described in About PSTATE.DIT.
This instruction might be immediately preceded in program order by a MOVPRFX instruction. The MOVPRFX must conform to all of the following requirements, otherwise the behavior of the MOVPRFX and this instruction is CONSTRAINED UNPREDICTABLE:
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