The IEEE 754-2008 standard, "An IEEE Standard for Binary Floating-Point Arithmetic", defines
) numbers as non-zero numbers smaller than the smallest possible normalized numbers for a specific floating-point format. Floating-point operations on denormals are slower than on normalized operands because denormal operands and results are usually handled through a software assist mechanism rather than directly in hardware. This software processing causes
Intel® oneAPI Math Kernel Library
functions that consume denormals to run slower than with normalized floating-point numbers.