This is the mail archive of the mailing list for the GCC project.

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: [PATCH] Fix PR18754: add early loop pass, 2nd try

On Thu, 20 Jan 2005, Giovanni Bajo wrote:

> > I'll get you numbers for
> > PR8361 and POOMA once a disable-checking bootstrap completed

Comparing -O2 with -O2 -ftree-early-loop-optimize (with Zdeneks
patch for complete unrolling applied, without that or -funroll-loops
the comparison doesn't make any sense - and without the patch we
should conditionalize the early loop on -funroll-loops):

          -O2       -O2 -ftree-early-loop-optimize
PR8361:   23.06s    23.86s                          +3.4%
tramp3d: 111.19s   116.70s                          +5.0%

PR8361 is not a runtime test, so runtime numbers only for tramp3d.

          w/o       w/ -ftree-early-loop-optimize
tramp3d:  13.10s    12.40s                          -5.5%

(though we're memory bandwith limited in this test)

>From inspecting generated assembly code for POOMA, we don't do
very good.  It seems the reduced C++ testcase from 18754 does
not contain all difficulties.

Back to experimenting...


Richard Guenther <richard dot guenther at uni-tuebingen dot de>

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]