Singapore I believe will have the more restrictive luggage size on that schedule

Cabin baggage

Under the Singapore Airlines' cabin baggage policy, each passenger will be allowed the following cabin baggage allowance:

Cabin class Allowance Dimensions
Suites, First, Business
Two pieces*, 7 kg per piece
Sum of length, width, height (including protrusions) not exceeding 115 cm (45in), able to stow securely

Economy
One piece, 7 kg per piece
Sum of length, width, height (including protrusions) not exceeding 115 cm (45in), able to stow securely

22 x 14 x 9 is 45 inches, which is their maximum, though the weight limit will be limiting what you can stuff into it.