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On 8 February 2013 12:28, Sebastien DELDON-GNB <sebastien.deldon at st.com>wrote: > Why for cortex-a9 vmlx-forwarding is enabled by default ? Is it to > guarantee correctness or for performance purpose ? I’ve made some > experiments and DISABLING vmlx-forwarding for cortex-a9 leads to generation > of more vmla/vmls .f32 and significantly improve some benchmarks. I’ve not >

Hi Renato, Thanks for the answer, it confirms what I was suspecting. My problem is that this behavior is controlled by vmlx forwarding on cortex-a9 for which despite asking on this list, I couldn't get a clear understanding what this option is meant for. So here are my new questions: Why for cortex-a9 vmlx-forwarding is enabled by default ? Is it to guarantee correctness or for performance

...appropriate and not to rely on disabling/enabling vmlx-forwarding. In that case, you must disable the pass when you call the back-end. cheers, --renato -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20130211/e51eb50f/attachment.html>