[LLVMdev] Request for Help: Teach ARM target to auto-detect cpu / subtarget features

Evan Cheng evan.cheng at apple.com
Thu May 10 22:11:23 CDT 2012


Hi all,

I've just filed PR12794: Add ARM cpu / subtarget features auto-detection. And I would very much appreciate the community's help to implement this.

What motivated this? Well this:
http://www.phoronix.com/scan.php?page=news_item&px=MTA5OTM

I believe one of the reason the benchmark numbers are totally bogus is that the compilation are done on ARM hosts. Given the benchmarks are apparently compiled without -mcpu=cortex-a9, I suspect LLVM ended up generating code for "generic" ARMv4 cpu. This article makes me sick in my stomach.

Thanks,

Evan


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