On Tue, Jan 4, 2011 at 4:43 AM, Martin Reinecke <mar...@mpa-garching.mpg.de> wrote: > Hi, > > while benchmarking a numerical C library making heavy use of SSE2 > intrinsics, I have noticed a significant (around 10 percent) slowdown > in the code generated by the current gcc trunk, compared to the one > produced by the 4.5.1 release. > It's quite hard to reduce the code to a small test case, but I can easily > point out the hot code regions where most of the CPU time is spent. > Do you think I should open a PR for this, or is this kind of performance > fluctuation to be expected? >
What compiler flags are you using? On which processors do you run the library? -- H.J.
