__mulhd, __mulhdu

Purpose

Multiply High Doubleword Signed, Multiply High Doubleword Unsigned

Returns the highorder 64 bits of the 128bit product of the two parameters.

Prototype

long long int __mulhd ( long int, long int);

unsigned long long int __mulhdu (unsigned long int, unsigned long int);

Usage

Valid only in 64-bit mode.