Function intnat::shoupMulHi(uint64_t, uint64_t)

• Defined in File transformnat-impl.h

Function Documentation

static inline uint64_t intnat::shoupMulHi(uint64_t a, uint64_t b)

High word of the 64x64-bit product, as used by the Shoup multiplication; uses the 128-bit type, the x86-64 mulq instruction, or 32-bit halves depending on the target.

Parameters

• a – is the first factor.

• b – is the second factor.

Returns

the upper 64 bits of a * b.