HH\int_mul_add_overflow

Returns the overflow part of multiplying two ints plus another int, as if they were all unsigned

namespace HH;

function int_mul_add_overflow(
  int $a,
  int $b,
  int $bias,
): int;

Specifically, this returns the upper 64 bits of full (unsigned)$a * (unsigned)$b + (unsigned)$bias. $bias can be used to manipulate rounding of the result.

Parameters

• int $a
• int $b
• int $bias

Returns

• int