SYSTEMS, APPARATUSES, AND METHODS FOR DETERMINING TRAILING LEAST SIGNIFICANT MASKING BIT OF WRITEMASK REGISTER

摘要

PROBLEM TO BE SOLVED: To provide common operation means which in general makes it possible to adjust mask bits within writemask registers that correspond to elements in a vector register referred to in a SIMD operation instruction.SOLUTION: The execution of a KZBTZ detects a trailing least significant zero bit position in a first input mask and sets an output mask to have values of the first input mask, but with all bit positions closer to the most significant bit position than the trailing least significant zero bit position in a first input mask set to zero. In some embodiments, a second input mask is used as a writemask such that bit positions of the first input mask are not considered in the trailing least significant zero bit position calculation depending upon a corresponding bit position in the second input mask.