Clang Fights GCC On AMD's Athlon AM1 APU With Jaguar Cores
Written by Michael Larabel in Software on 22 April 2014. Page 2 of 4. 9 Comments

The SciMark computational performance between GCC 4.8.2 and LLVM Clang 3.4 started out at roughly the same speed...

However, in the final SciMark tests of the Sparse Matrix Multiply, Dense LU Matrix Factorization, and Jacobi Successive Over-Relaxation sub-tests, Clang 3.4 speeded ahead of GCC 4.8.2. There were noticeable performance advantages to LLVM's Clang on this AM1 Kabini APU for these workloads over GCC.

One item to just to point out for those that may be new to the LLVM/Clang world... This compiler still sadly lacks support for OpenMP. Thus applications that utilize OpenMP for multi-threading are left slower on Clang until the OpenMP support is merged. There's out-of-tree LLVM/Clang OpenMP support but nothing that's in the mainline code as of right now.


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