Soon after Grand Theft Auto V arrived, NVIDIA made it known that two of its GameWorks technologies were showcased in Rockstar's title. Both Percentage Closer Soft Shadows (PCSS) and TXAA are utilized and help give the game a boost. AMD wanted to announce that its Contact Hardening Shadows (CHS) were also used, and that GTA V is part of its Gaming Evolved initiative. However, that last part isn't entirely accurate, as GTA V is not a part of Gaming Evolved, but it still uses CHS. So, AMD basically lied about its involvement with GTA V, which probably wasn't the smartest move on its part. Having CHS included is a good thing, but lying about the game being part of Gaming Evolved is not.
Source: The Tech Report (updated)