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I use Xcode 4.5.2 with “Apple LLVM Compiler 4.1” (Clang).
I tried to compile a code which heavily relies on SSE intrinsics with AVX enabled (no _mm256* functions and no __m256 variables yet) and got slower code then I get when only SSE 4.2 is enabled.
Is there any reasonable explanation for this?
Currently LLVM has opened bugs related to AVX performance, such as this one for example.
The full avx-related bugs list can be found here.