Re: Code performance regression between gcc 4.5 and 4.6

2011-01-04 Thread Martin Reinecke
On 01/04/11 15:10, H.J. Lu wrote: We need a testcase to investigate. This is now PR47167. Cheers, Martin

Re: Code performance regression between gcc 4.5 and 4.6

2011-01-04 Thread H.J. Lu
On Tue, Jan 4, 2011 at 5:57 AM, Martin Reinecke wrote: > > > On 01/04/11 14:48, H.J. Lu wrote: >> >> On Tue, Jan 4, 2011 at 4:43 AM, Martin Reinecke >>  wrote: >>> >>> Hi, >>> >>> while benchmarking a numerical C library making heavy use of SSE2 >>> intrinsics, I have noticed a significant (aroun

Re: Code performance regression between gcc 4.5 and 4.6

2011-01-04 Thread Martin Reinecke
On 01/04/11 14:48, H.J. Lu wrote: On Tue, Jan 4, 2011 at 4:43 AM, Martin Reinecke 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 th

Re: Code performance regression between gcc 4.5 and 4.6

2011-01-04 Thread H.J. Lu
On Tue, Jan 4, 2011 at 4:43 AM, Martin Reinecke 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 r

Code performance regression between gcc 4.5 and 4.6

2011-01-04 Thread Martin Reinecke
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, b