Date: Sat, 8 Dec 2012 20:48:19 -0500 From: Alain Espinosa <alainesp@...il.com> To: john-dev@...ts.openwall.com Subject: Re: GCN: indexed access to VGPRs On 12/8/12, Solar Designer <solar@...nwall.com> wrote: > 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. I think Nvidia cards supports this too, but using indexed registers is slower than using "static" registers. In some fast kernels i get a ~50% speedup changing to normal registers. > 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. In OpenCL when you use a private array the compiler may use indexed registers. saludos, alain
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