tree ea4b70a8a4fcc4b1f88e83a86136001b620cbc62
parent 149ae11fb63818b470156e1652abfad0e08d486d
author Bhanu Chetlapalli <bhanu@mips.com> 1327531530 -0800
committer Bhanu Chetlapalli <bhanu@mips.com> 1327531530 -0800

Prevent bit shifting if num bits is negative

Causes OpenGL Software Renderer to generate incorrect window
coordinates on MIPS & possibly x86

Change-Id: I3c51b6a5a4e6af75e9b31d9d47e4e4d894825888
Signed-off-by: Bhanu Chetlapalli <bhanu@mips.com>