Comment # 33
on bug 92214
from Barto
(In reply to Roland Scheidegger from comment #32) > I believe the patch posted by Jose here, > http://lists.freedesktop.org/archives/mesa-dev/2015-October/097948.html > should help. > I tested the patch posted by Jose, it doesn't solve the bug, the crash is still here ( "illegal instruction" ), we need to be sure that the "SSE4" argument is not passed to the llvm compiler by mesa if the CPU doesn't support SSE4, for llvm 3.7.0 my cpu name is "penryn" and it seems that SSE4 is enabled by default for penryn cpu in llvm default settings, that's why a check must be done by mesa in order to avoid this crash ( illegal opcode cpu ) when a pentium dual core is used, the SSE4 argument should not be passed to the llvm compiler if the CPU doesn't support it, I don't know exactly what is wrong in mesa source code, if the check related to SSE4 is really done and if mesa tries to pass to llvm the good cpu features arguments ( SSEx, MMX, AVX... ), for now the workaround I found is to patch LLVM 3.7.0 in order to re-add the "SSE4 test", my CPU name will be after this patch : "core2", which was the default behaviour in previous versions of LLVM ( like 3.6.2 version ) : --- a/lib/Support/Host.cpp 2015-10-14 07:13:52.381374679 +0200 +++ b/lib/Support/Host.cpp 2015-10-14 07:13:28.224708323 +0200 @@ -332,6 +332,8 @@ // 17h. All processors are manufactured using the 45 nm process. // // 45nm: Penryn , Wolfdale, Yorkfield (XE) + // Not all Penryn processors support SSE 4.1 (such as the Pentium brand) + return HasSSE41 ? "penryn" : "core2"; case 29: // Intel Xeon processor MP. All processors are manufactured using // the 45 nm process. return "penryn";
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