[Bug target/38824] [4.4 Regression] performance regression of sse code from 4.2/4.3

["tim at klingt dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #9 from tim at klingt dot org  2009-01-24 09:56 -------
> Hi tim, I extracted this test case from your website. But I can't exactly
> reproduce this bug on my machine with a core2 quard micor processor. Can you
> help me to check whether my test case is valid firstly? Here I post what I got
> on my machine for your reference:

the benchmark test case looks fine.

the times on my machine:
gcc-4.2:
tim@thinkpad:~/sandbox$ time ./a.out 

real    0m1.852s
user    0m1.829s
sys     0m0.010s
tim@thinkpad:~/sandbox$ time ./a.out 

real    0m1.826s
user    0m1.817s
sys     0m0.002s
tim@thinkpad:~/sandbox$ time ./a.out 

real    0m1.833s
user    0m1.826s
sys     0m0.001s

gcc-4.3:
time ./a.out 

real    0m2.062s
user    0m2.047s
sys     0m0.002s
tim@thinkpad:~/sandbox$ time ./a.out 

real    0m2.061s
user    0m2.043s
sys     0m0.006s
tim@thinkpad:~/sandbox$ time ./a.out 

real    0m2.101s
user    0m2.053s
sys     0m0.036s

gcc-4.4 (20090111):
tim@thinkpad:~/sandbox$ time ./a.out 

real    0m2.536s
user    0m2.481s
sys     0m0.017s
tim@thinkpad:~/sandbox$ time ./a.out 

real    0m2.497s
user    0m2.467s
sys     0m0.003s
tim@thinkpad:~/sandbox$ time ./a.out 

real    0m2.539s
user    0m2.484s
sys     0m0.036s

best, tim


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38824