I tried to reproduce the results, but the Haskell bit failed to compile on my Mac with the -fvia-C flag. Without the -fvia-C flag, the Haskell version takes abo

I tried to reproduce the results, but the Haskell bit failed to compile on my Mac with the -fvia-C flag. Without the -fvia-C flag, the Haskell version takes about 11 times as long to run as the C version. A simple Go version runs at the same speed as the C version. I posted some code to run the comparison at https://github.com/ijt/fast-as-c-article https://github.com/ijt/fast-as-c-article. Here are the results: [ issactrotts ~/haskell/fast-as-c-article ] ./compare == cmean == gcc -O2 -o cmean cmean.c mean: 500000000.500000 real 0m0.774s user 0m0.770s sys 0m0.002s == gomean == 6g gomean.go 6l -o gomean gomean.6 mean: 500000000.500000 real 0m0.776s user 0m0.769s sys 0m0.003s == hsmean == ghc -O2 hsmean.hs -optc-O2 -fvia-C --make [1 of 1] Compiling Main ( hsmean.hs, hsmean.o ) In file included from /usr/local/Cellar/ghc/7.0.4/lib/ghc-7.0.4/include/Stg.h:230, from /var/folders/g2/ylbqfw5533n65z6qkxljg0_h0000gn/T/ghc23078_0/ghc23078_0.hc:3:0: /usr/local/Cellar/ghc/7.0.4/lib/ghc-7.0.4/include/stg/Regs.h:177:0: sorry, unimplemented: LLVM cannot handle register variable ‘R1’, report a bug make: *** [hsmean] Error 1 == hsmean_nollvm == ghc -O2 hsmean.hs -optc-O2 --make -o hsmean_nollvm [1 of 1] Compiling Main ( hsmean.hs, hsmean.o ) Linking hsmean_nollvm ... ld: warning: could not create compact unwind for .LFB3: non-standard register 5 being saved in prolog mean: 500000000.067109 real 0m8.886s user 0m8.863s sys 0m0.018s