FMAXQV

Floating-point maximum reduction of quadword vector segments

This instruction calculates a floating-point maximum of the same element numbers from each 128-bit source vector segment using a recursive pairwise reduction, and places each result into the corresponding element number of the 128-bit SIMD&FP destination register. Inactive elements in the source vector are treated as -Infinity.

When FPCR.AH is 0, the behavior is as follows:

• Negative zero compares less than positive zero.
• When FPCR.DN is 0, if either value is a NaN, the result is a quiet NaN.
• When FPCR.DN is 1, if either value is a NaN, the result is Default NaN.

When FPCR.AH is 1, the behavior is as follows:

• If both values are zeros, regardless of the sign of either zero, the result is the second value.
• If either value is a NaN, regardless of the value of FPCR.DN, the result is the second value.

SVE2
(FEAT_SVE2p1 || FEAT_SME2p1)

Decode for this encoding

if !IsFeatureImplemented(FEAT_SVE2p1) && !IsFeatureImplemented(FEAT_SME2p1) then EndOfDecode(Decode_UNDEF); end; if size == '00' then EndOfDecode(Decode_UNDEF); end; let esize : integer{} = 8 << UInt(size); let g : integer = UInt(Pg); let n : integer = UInt(Zn); let d : integer = UInt(Vd);