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Mac Forum / Programming / CodeWarrior / February 2005GCC vs CodeWarrior - performance?
Has anyone done a side-by-side performance test on the code created by the two compilers? I've heard that GCC's code isn't as optimized as CW's. Blair M. Burtan Northern Lights Productions http://www.northernlights3D.com > Has anyone done a side-by-side performance test on the code created by the > two compilers? I've heard that GCC's code isn't as optimized as CW's. > > Blair M. Burtan > Northern Lights Productions > http://www.northernlights3D.com If anyone does, you might want to include std::lib performance too (check out inserting into vector<string> for example, or maybe vector<map<string, string> > ;-)). -Howard > Has anyone done a side-by-side performance test on the code created by the > two compilers? I've heard that GCC's code isn't as optimized as CW's. I'd be happy to run some benchmarks for you, but my "hello, world" Mach-O CW8 project doesn't build: Error : Internal Mach-O Importer Error File 'ImportMachO.c' Line 2028 unsupported unknown reloc type 13 (hunk_type = 65535) MachO Import PPC: 3.0.3 Build 0343 O/S: 10.3.7 --Toby > Blair M. Burtan > Northern Lights Productions > http://www.northernlights3D.com > I'd be happy to run some benchmarks for you, but my "hello, world" > Mach-O CW8 project doesn't build: [quoted text clipped - 5 lines] > > --Toby You forgot to replace the crt1.o from the stationery with mwcrt1.o (search for it in the Metrowerks folder) this is something that Apple changed after 8 shipped. Remember, after adding mwcrt1.o t you project, to move it to the top of the "link order" panel.  SignatureDavid Phillip Oster > > I'd be happy to run some benchmarks for you, but my "hello, world" > > Mach-O CW8 project doesn't build: [quoted text clipped - 8 lines] > You forgot to replace the crt1.o from the stationery with mwcrt1.o > (search for it in the Metrowerks folder) this is something that Apple > changed after 8 shipped. Thanks for the tip, that worked perfectly. --Toby > Remember, after adding mwcrt1.o t you project, to move it to the top of > the "link order" panel. > Has anyone done a side-by-side performance test on the code created by the > two compilers? I've heard that GCC's code isn't as optimized as CW's. It undoubtedly depends on the details of what you're doing. How quick and dirty a comparison would you like? On my favourite *integer* benchmark (Fhourstones, http://www.cwi.nl/~tromp/c4/fhour.html), on a typical run*, code built by gcc 3.3 at -O2 runs around 20% faster than CW8 build at opt 4. Both targeting generic PPC. The other PPC contender, MPW's mrc (-opt speed), outperforms them both on this benchmark; its build runs around 35% faster than the CW8 build. That's one reason I build all my plugins with it (PEF, Carbon/Classic runtimes). Typical Fhourstones run (higher is better), 1.25GHz G4 gcc -O2 = 672.8 Kpos/sec cw8 -O4 = 561.8 Kpos/sec mrc -opt speed = 756.2 Kpos/sec (under MPW/Classic no less) --Toby Free Photoshop compatible plugins @ http://www.telegraphics.com.au/sw/ *c4 benchmark parameters: -DTRANSIZE=1050011 -DPROBES=8 -DREPORTPLY=8 input = 444333377 > Blair M. Burtan > Northern Lights Productions > http://www.northernlights3D.com > ... my favourite > *integer* benchmark (Fhourstones, > http://www.cwi.nl/~tromp/c4/fhour.html), on a typical run*, I should clarify, the code I was using is Fhourstones *2.0*, for which the correct URL is http://homepages.cwi.nl/~tromp/c4/fhour2.html > --Toby > Free Photoshop compatible plugins @ http://www.telegraphics.com.au/sw/ > Has anyone done a side-by-side performance test on the code created by the > two compilers? I've heard that GCC's code isn't as optimized as CW's. I did a build of a game port in XCode and compared performance to CW 9.3. The end result was that the CW build was just a fraction faster in terms of raw frames-per-second. We're talking ~0.5 fps out of ~20 on average, probably within the margin of error. This game was a light user of the STL, fwiw. SignatureBrad Oliver bradman@pobox.com.AM_SPAY |
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