FAMAX

Floating-point absolute maximum

This instruction determines the maximum absolute value from floating-point elements of the first source vector and the corresponding floating-point elements of the second source vector, and places the results in the corresponding elements of the destination vector.

Regardless of the value of FPCR.AH, 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, with the sign bit set to 0.
• Denormalized inputs and results are never flushed to zero, as if FPCR.{FZ, FZ16, FIZ} are all 0.
• Denormalized inputs never generate an Input Denormal floating-point exception.

It has encodings from 2 classes: Half-precision and Single-precision and double-precision

Half-precision
(FEAT_AdvSIMD && FEAT_FAMINMAX)

Decode for this encoding

if !IsFeatureImplemented(FEAT_AdvSIMD) || !IsFeatureImplemented(FEAT_FAMINMAX) then EndOfDecode(Decode_UNDEF); end; let d : integer{} = UInt(Rd); let n : integer{} = UInt(Rn); let m : integer{} = UInt(Rm); let esize : integer{} = 16; let datasize : integer{} = if Q == '1' then 128 else 64; let elements : integer = datasize DIV esize;

Single-precision and double-precision
(FEAT_AdvSIMD && FEAT_FAMINMAX)

Decode for this encoding

if !IsFeatureImplemented(FEAT_AdvSIMD) || !IsFeatureImplemented(FEAT_FAMINMAX) then EndOfDecode(Decode_UNDEF); end; if Q == '0' && size == '11' then EndOfDecode(Decode_UNDEF); end; let d : integer{} = UInt(Rd); let n : integer{} = UInt(Rn); let m : integer{} = UInt(Rm); let esize : integer{} = 8 << UInt(size); let datasize : integer{} = if Q == '1' then 128 else 64; let elements : integer = datasize DIV esize;