Comment # 30
on bug 92214
from Barto
I found the cause of this bug, it's llvm 3.7.0, the llvm git commit who has introduced this bug is : cd83d5b5071f072882ad06cc4b904b2d27d1e54a https://github.com/llvm-mirror/llvm/commit/cd83d5b5071f072882ad06cc4b904b2d27d1e54a the problem is that llvm 3.7.0 treats my pentium dual core as a "penryn", penryn supports SSE4, but not the pentium dual core series ( CPU family 6 model 23 ), the faulty commit has deleted a test about SSE4 : return HasSSE41 ? "penryn" : "core2"; the solution is simply to add this test for CPU family 6 model 23, I created a patch who solves this bug : --- 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"; this patch has been sent to llvm's bugzilla, I hope they will accept it
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