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...hat 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. > I skip through MCTargetDesc/ARMAsmBackend.cpp, it seems llvm::createARMAsmBackend > only pickup different ARM ISA for Darwin. As for Linux, I guess we need to tweak > ELFARMAsmBackend? Do we need to modify Clang as well? > > Regards, > chenwj > The backend sounds like the wrong place to implement this feature. I'd have thought the Clang driver would be the...

...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. I skip through MCTargetDesc/ARMAsmBackend.cpp, it seems llvm::createARMAsmBackend only pickup different ARM ISA for Darwin. As for Linux, I guess we need to tweak ELFARMAsmBackend? Do we need to modify Clang as well? Regards, chenwj -- Wei-Ren Chen (陳韋任) Computer Systems Lab, Institute of Information Science, Academia Sinica, Taiwan (R.O.C.) Tel:886-2-2788-3799 #1667 Homepage...

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

...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. >> I skip through MCTargetDesc/ARMAsmBackend.cpp, it seems llvm::createARMAsmBackend >> only pickup different ARM ISA for Darwin. As for Linux, I guess we need to tweak >> ELFARMAsmBackend? Do we need to modify Clang as well? >> >> Regards, >> chenwj >> > The backend sounds like the wrong place to implement this feature. > > I'd h...