CLANG vs GCC tests of fortran/f2c program
Wojciech Puchar
wojtek at wojtek.tensor.gdynia.pl
Wed Jun 20 04:26:21 UTC 2012
i tested your test program, and in that case, contrary to testing common
unix programs, difference is far higher showing gcc superiority.
i did this test with FreeBSD 9 supplied clang and FreeBSD 9 supplied gcc.
clearly shows that clang actually cannot do more agressive optimization
(that trades space) at all, and at -O2 is far slower.
produced:
-rwxr-xr-x 1 tmp tmp 11168 20 cze 06:18 test.cc.O2
-rwxr-xr-x 1 tmp tmp 17024 20 cze 06:18 test.cc.O3
-rwxr-xr-x 1 tmp tmp 17024 20 cze 06:18 test.cc.O9
-rwxr-xr-x 1 tmp tmp 11096 20 cze 06:18 test.clang.O2
-rwxr-xr-x 1 tmp tmp 11096 20 cze 06:18 test.clang.O3
cc.O2:
real 0m2.877s
user 0m2.829s
sys 0m0.030s
cc.O3:
real 0m2.142s
user 0m2.131s
sys 0m0.000s
cc.09:
real 0m2.071s
user 0m2.054s
sys 0m0.008s
clang.O2:
real 0m3.440s
user 0m3.405s
sys 0m0.018s
clang.O3:
real 0m3.217s
user 0m3.205s
sys 0m0.001s
How about leaving politics and getting back to technical grounds?
>From what i know now GPLv3 isn't really a problem for us, your may freely
distribute binary only software compiled by latest gcc.
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