The conference venue is in downtown Seattle on the waterfront. The location is:
     
Seattle Waterfront Marriott
      2100 Alaskan Way
      Seattle, Washington 98121
      Phone: 206-443-5000
The hotel reservation deadline for conference rates is EXTENDED to start of conference.
Toll-free reservations can be made at 1-800 455-8254 or by calling the hotel directly. Please mention IEEE and 2009 International Symposium on Code Generation and Optimization to get the special conference rate.
Use this link for convenient Online Reservations