SQDMULH (indexed)

Signed saturating doubling multiply high (indexed)

Multiply all signed elements within each 128-bit segment of the first source vector by the specified signed element in the corresponding second source vector segment, double and place the most significant half of the result in the corresponding elements of the destination vector register. Each result element is saturated to the N-bit element's signed integer range -2^(N-1) to (2^(N-1) )-1.

The elements within the second source vector are specified using an immediate index which selects the same element position within each 128-bit vector segment. The index range is from 0 to one less than the number of elements per 128-bit segment, encoded in 1 to 3 bits depending on the size of the element.

It has encodings from 3 classes: 16-bit , 32-bit and 64-bit

16-bit

if !HaveSVE2() && !HaveSME() then UNDEFINED; integer esize = 16; integer index = UInt(i3h:i3l); integer n = UInt(Zn); integer m = UInt(Zm); integer d = UInt(Zd);

32-bit

if !HaveSVE2() && !HaveSME() then UNDEFINED; integer esize = 32; integer index = UInt(i2); integer n = UInt(Zn); integer m = UInt(Zm); integer d = UInt(Zd);

64-bit

if !HaveSVE2() && !HaveSME() then UNDEFINED; integer esize = 64; integer index = UInt(i1); integer n = UInt(Zn); integer m = UInt(Zm); integer d = UInt(Zd);