John Regehr
2009-Dec-14 15:33 UTC
[LLVMdev] detailed comparison of generated code size for LLVM and other compilers
See here: http://embed.cs.utah.edu/embarrassing/ There is a lot of data there. Please excuse bugs and other problems. Feedback would be appreciated. John Regehr
Chris Lattner
2009-Dec-14 17:46 UTC
[LLVMdev] detailed comparison of generated code size for LLVM and other compilers
On Dec 14, 2009, at 7:33 AM, John Regehr wrote:> See here: > > http://embed.cs.utah.edu/embarrassing/ > > There is a lot of data there. Please excuse bugs and other problems. > Feedback would be appreciated.Hi John, I agree with the gcc folks: it's really important to get frame pointer emission etc aligned across the various compilers. ICC defaulting to frame pointers off and GCC/llvm defaulting to them on will seriously warp the numbers. Also, while I agree that compilers should all optimize undefined behavior away as aggressively as possible, I also think it's not a very "interesting" test in the grand scheme of things. :) Very interesting work though, I hope to have some time to dive in more later, -Chris
Dale Johannesen
2009-Dec-14 19:04 UTC
[LLVMdev] detailed comparison of generated code size for LLVM and other compilers
On Dec 14, 2009, at 9:46 AMPST, Chris Lattner wrote:> > On Dec 14, 2009, at 7:33 AM, John Regehr wrote: > >> See here: >> >> http://embed.cs.utah.edu/embarrassing/ >> >> There is a lot of data there. Please excuse bugs and other problems. >> Feedback would be appreciated. > > Hi John, > > I agree with the gcc folks: it's really important to get frame pointer > emission etc aligned across the various compilers. ICC defaulting to > frame pointers off and GCC/llvm defaulting to them on will seriously > warp the numbers.Where did the gcc folks express this opinion? There are probably other differing defaults besides frame pointers. Stack protectors, perhaps.
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