HISTCNT

Count matching elements in vector

This instruction compares each active 32 or 64-bit element of the first source vector with all active elements with an element number less than or equal to its own in the second source vector, and places the count of matching elements in the corresponding element of the destination vector. Inactive elements in the destination vector are set to zero.

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

if !HaveSVE2() then UNDEFINED; if size IN {'0x'} then UNDEFINED; constant integer esize = 8 << UInt(size); integer g = UInt(Pg); integer d = UInt(Zd); integer n = UInt(Zn); integer m = UInt(Zm);