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MLAPT

Multiply-add checked pointer vectors

This instruction multiplies, with overflow check, the elements of the first and second source vectors and adds the results of multiplication, with pointer check, to elements of the third source (addend) vector. The final results are destructively placed in the destination and third source (addend) vector.

This instruction is illegal when executed in Streaming SVE mode, unless FEAT_SME_FA64 is implemented and enabled.

SVE2 class

(FEAT_SVE && FEAT_CPA)

313029282726252423222120191817161514131211109876543210
01000100110Zm110100ZnZda
opco2

Encoding

MLAPT <Zda>.D, <Zn>.D, <Zm>.D

Decode

if !IsFeatureImplemented(FEAT_SVE) || !IsFeatureImplemented(FEAT_CPA) then EndOfDecode(Decode_UNDEF); constant integer n = UInt(Zn); constant integer m = UInt(Zm); constant integer da = UInt(Zda);

Assembler Symbols

<Zda>

Is the name of the third source and destination scalable vector register, encoded in the "Zda" field.

<Zn>

Is the name of the first source scalable vector register, encoded in the "Zn" field.

<Zm>

Is the name of the second source scalable vector register, encoded in the "Zm" field.

Operation

CheckNonStreamingSVEEnabled(); constant integer VL = CurrentVL; constant integer elements = VL DIV 64; constant bits(VL) operand1 = Z[n, VL]; constant bits(VL) operand2 = Z[m, VL]; constant bits(VL) operand3 = Z[da, VL]; bits(VL) result; for e = 0 to elements-1 constant integer element1 = SInt(Elem[operand1, e, 64]); constant integer element2 = SInt(Elem[operand2, e, 64]); constant integer product = element1 * element2; constant boolean overflow = (product != SInt(product<63:0>)); constant bits(64) addend = Elem[operand3, e, 64]; Elem[result, e, 64] = PointerMultiplyAddCheck(addend + product, addend, overflow); Z[da, VL] = result;

Operational information

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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