Date: Sun, 9 Dec 2012 05:12:41 +0400 From: Solar Designer <solar@...nwall.com> To: john-dev@...ts.openwall.com Subject: GCN: indexed access to VGPRs Sayantan, Milen, all - On page 53 in AMD_Southern_Islands_Instruction_Set_Architecture.pdf (SHA-1: c64c24077eab93b070d291da3624a8d988d70d5d), there's a mention that VGPRs may be indexed - something I had thought was not possible. This may let us use the vector register file to augment LDS, e.g. to compute a larger number of bcrypt hashes in parallel (some will have their S-boxes in LDS, and some more - in VGPRs). I guess we have spare VGPRs in our current bcrypt code (since we bump into LDS size first). I don't know if there's currently a way to access this functionality without going to a level lower than OpenCL or not, though. Alexander
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