Compute the bitwise AND of 256 bits (representing double-precision (64-bit) floating-point
elements) in a and b, producing an intermediate 256-bit value, and set ZF to 1 if the
sign bit of each 64-bit element in the intermediate value is zero, otherwise set ZF to 0.
Compute the bitwise NOT of a and then AND with b, producing an intermediate value, and set
CF to 1 if the sign bit of each 64-bit element in the intermediate value is zero, otherwise
set CF to 0. Return 1 if both the ZF and CF values are zero, otherwise return 0.
In other words: there is at least one negative number in b that correspond to a positive number in a,
AND there is at least one negative number in b that correspond to a negative number in a.
Compute the bitwise AND of 256 bits (representing double-precision (64-bit) floating-point elements) in a and b, producing an intermediate 256-bit value, and set ZF to 1 if the sign bit of each 64-bit element in the intermediate value is zero, otherwise set ZF to 0. Compute the bitwise NOT of a and then AND with b, producing an intermediate value, and set CF to 1 if the sign bit of each 64-bit element in the intermediate value is zero, otherwise set CF to 0. Return 1 if both the ZF and CF values are zero, otherwise return 0.
In other words: there is at least one negative number in b that correspond to a positive number in a, AND there is at least one negative number in b that correspond to a negative number in a.