search for: ralf_karrenberg

...barriers - the sequence of barriers that are hit by all workitems in a workgroup must be identical. An issue occurs when defining what "the same barrier" actually means, however. GPU Hardware, and CPU implementations such as Ralf Karrenberg's (http://llvm.org/devmtg/2012-04-12/Slides/Ralf_Karrenberg.pdf) key off the PC, so barrier call A and barrier call B are the same if and only if the PC value at A and B is the same, for some definition of PC. Last time this was mentioned, Eli suggested that keying off the PC was a bit silly - it is my understanding that the next CL spec has "named ba...

...barriers - the sequence of barriers that are hit by all workitems in a workgroup must be identical. An issue occurs when defining what "the same barrier" actually means, however. GPU Hardware, and CPU implementations such as Ralf Karrenberg's (http://llvm.org/devmtg/2012-04-12/Slides/Ralf_Karrenberg.pdf) key off the PC, so barrier call A and barrier call B are the same if and only if the PC value at A and B is the same, for some definition of PC. Last time this was mentioned, Eli suggested that keying off the PC was a bit silly - it is my understanding that the next CL spec has "named ba...