I have been looking through the performance tips section of the manual. Specifically, I am curious about @simd (http://docs.julialang.org/en/release-0.4/manual/performance-tips/#performance-annotations).
When I cut and paste the code demonstrating the @simd macro, I don't get substantial speedups. Before updating from OSX Yosemite to El Capitan, I saw no speedup whatsoever. After the update, there is a small speedup (I ran the example repeatedly): julia> timeit(1000,1000) GFlop = 1.2292170133468385 GFlop (SIMD) = 1.5351220575547964 This contrasts sharply to the example in the documentation which shows a speedup from 1.95GFlop to 17.6GFlop. Does my computer not have simd? How can I tell? This is my versioninfo: Julia Version 0.4.0 Commit 0ff703b* (2015-10-08 06:20 UTC) Platform Info: System: Darwin (x86_64-apple-darwin15.0.0) CPU: Intel(R) Core(TM) i7-4850HQ CPU @ 2.30GHz WORD_SIZE: 64 BLAS: libopenblas (DYNAMIC_ARCH NO_AFFINITY Haswell) LAPACK: libopenblas LIBM: libopenlibm LLVM: libLLVM-3.3
