Some time ago in mesa 9.2 there was a new feature (the r600 back-end) that bring better performance, but it was disabled by default (enabled by default in 10.0). I activate that feature with
R600_DEBUG=sb,nollvm
and the performance was better, but if I did this
R600_DEBUG=sb
the performance was even better.
That means than the LLVM stuff meant more performance. Thats why I was curious about how the performance would be affected now than the feature is going to be disabled.
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R600 Gallium3D Disables LLVM Back-End By Default
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As far as I remember, the LLVM backend has always been slower on R600 since Vadim's backend was merged. Why people think LLVM should be faster is a mystery to me.
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Originally posted by edoantonioco View PostDoes this means less performance? And are we talking about mesa 10.2?, because its not explained.
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Originally posted by 89c51 View PostDoes this also mean that r600 will never get FOSS OpenCL ?? (when and if ready)
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Originally posted by 89c51 View PostDoes this also mean that r600 will never get FOSS OpenCL ?? (when and if ready)
Originally posted by ryszardzonk View Post" --enable-r600-llvm-compiler [...] but now not even that will disable the compiler back-end by default for this driver." IMHO it should say enable not disable otherwise I fail to find logical conclusion from that statement.
//EDIT: In other words: --enable-r600-llvm-compiler compiles the support in (this is a compile-time switch) while R600_DEBUG=llvm enables it at runtime (it is a runtime switch).Last edited by V10lator; 17 April 2014, 07:18 AM.
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" --enable-r600-llvm-compiler [...] but now not even that will disable the compiler back-end by default for this driver." IMHO it should say enable not disable otherwise I fail to find logical conclusion from that statement.
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Does this also mean that r600 will never get FOSS OpenCL ?? (when and if ready)
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Originally posted by edoantonioco View PostDoes this means less performance?
Originally posted by bridgman View PostMy recollection was that Vadim's "sb" option was running at about the same speed as llvm, and I believe it was enabled by default.
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On my previous a10-5800k APU, Vadim's SB compiler was much better than llvm. I tested it a lot.
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Originally posted by bridgman View PostAre you sure there's a performance hit ? My recollection was that Vadim's "sb" option was running at about the same speed as llvm, and I believe it was enabled by default.
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