[LLVMbugs] [Bug 928] Investigate cases where running llvm optimizer twice slows down code

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Tue Feb 19 01:36:46 PST 2008


Bill Wendling <isanbard at gmail.com> changed:

           What    |Removed                     |Added
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |WORKSFORME

--- Comment #4 from Bill Wendling <isanbard at gmail.com>  2008-02-19 03:36:44 ---
This doesn't appear to be happening anymore. The fibo execution time with -O0
and with -O2 is pretty much the same:

[Gaz:Shootout-C++] time ./Output/fibo.llc  # With -O2

real    0m10.129s
user    0m9.935s
sys     0m0.034s
[Gaz:Shootout-C++] time ./fibo.O0.llc  # With -O0

real    0m10.125s
user    0m9.935s
sys     0m0.034s
[Gaz:Shootout-C++] time ./Output/fibo.native 

real    0m10.752s
user    0m10.339s
sys     0m0.041s

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