FAMAX Floating-point absolute maximum (predicated) Determine the maximum absolute value from active floating-point elements of the second source vector and the corresponding floating-point elements of the first source vector and destructively place the results in the corresponding elements of the first source vector. The behavior is as follows: When FPCR.DN is 0, if either element is a NaN, the result is a quiet NaN. When FPCR.DN is 1, if either element is a NaN, the result is the Default NaN. Denormalized inputs and results are never flushed to zero, as if FPCR.{FZ16, FZ, FIZ} are all 0. Denormalized inputs never generate an Input Denormal floating-point exception. Inactive elements in the destination vector register remain unmodified. Green True True True 0 1 1 0 0 1 0 1 0 0 1 1 1 0 1 0 0 FAMAX <Zdn>.<T>, <Pg>/M, <Zdn>.<T>, <Zm>.<T> if ((!IsFeatureImplemented(FEAT_SVE2) && !IsFeatureImplemented(FEAT_SME2)) || !IsFeatureImplemented(FEAT_FAMINMAX)) then UNDEFINED; if size == '00' then UNDEFINED; constant integer esize = 8 << UInt(size); constant integer g = UInt(Pg); constant integer dn = UInt(Zdn); constant integer m = UInt(Zm); <Zdn> Is the name of the first source and destination scalable vector register, encoded in the "Zdn" field. <T> Is the size specifier, size <T> 00 RESERVED 01 H 10 S 11 D
<Pg> Is the name of the governing scalable predicate register P0-P7, encoded in the "Pg" field. <Zm> Is the name of the second source scalable vector register, encoded in the "Zm" field.
CheckSVEEnabled(); constant integer VL = CurrentVL; constant integer PL = VL DIV 8; constant integer elements = VL DIV esize; constant bits(PL) mask = P[g, PL]; constant bits(VL) operand1 = Z[dn, VL]; constant bits(VL) operand2 = if AnyActiveElement(mask, esize) then Z[m, VL] else Zeros(VL); bits(VL) result; for e = 0 to elements-1 constant bits(esize) element1 = Elem[operand1, e, esize]; if ActivePredicateElement(mask, e, esize) then constant bits(esize) element2 = Elem[operand2, e, esize]; Elem[result, e, esize] = FPAbsMax(element1, element2, FPCR); else Elem[result, e, esize] = element1; Z[dn, VL] = result;