[Bug middle-end/71741] The program works 3 times slower compiled with g++ 5.3.1 than the same program compiled with g++ 4.8.4 with the same command (i7-5820 Haswell)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71741 Andrew Pinski changed: What|Removed |Added Status|WAITING |RESOLVED Resolution|--- |MOVED See Also||https://sourceware.org/bugz ||illa/show_bug.cgi?id=20495 --- Comment #5 from Andrew Pinski --- This was an issue in glibc as https://sourceware.org/bugzilla/show_bug.cgi?id=20495 shows. Closing as moved.
[Bug middle-end/71741] The program works 3 times slower compiled with g++ 5.3.1 than the same program compiled with g++ 4.8.4 with the same command (i7-5820 Haswell)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71741 Andrew Pinski changed: What|Removed |Added Status|UNCONFIRMED |WAITING Last reconfirmed||2016-07-24 Ever confirmed|0 |1 --- Comment #4 from Andrew Pinski --- Have you tried the binary you created with GCC 4.8.x and used it on the newer distro? If it is slower there, then this is a glibc issue. It has been known that glibc has slowed down sin/cos to make it more accurate in some corner cases which might be what you are seeing.
[Bug middle-end/71741] The program works 3 times slower compiled with g++ 5.3.1 than the same program compiled with g++ 4.8.4 with the same command (i7-5820 Haswell)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71741 Andrew Pinski changed: What|Removed |Added URL|http://stackoverflow.com/qu | |estions/38172066/the-progra | |m-works-3-times-slower-comp | |iled-with-g-5-3-1-than-the- | |same-program-c | Component|c++ |middle-end --- Comment #3 from Andrew Pinski --- http://stackoverflow.com/questions/38172066/the-program-works-3-times-slower-compiled-with-g-5-3-1-than-the-same-program-c
