From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeffrey A Law To: Aubert Pierre Cc: Martin Kahlert , egcs@cygnus.com Subject: Re: Performance measurements Date: Sat, 27 Jun 1998 02:25:00 -0000 Message-id: <5095.898928137@hurl.cygnus.com> References: X-SW-Source: 1998-06/msg00989.html > Just for information, on HP > > PA7200: gcc-2.7.2.2 -O3 : 26.63 MFLOPS > PA7200: egcs-2.91.42 -O3 : 47.13 MFLOPS > PA7200: cc -Ae +O4 : 52.88 MFLOPS > > PA8000: gcc-2.7.2.2 -O3 : 108.31 MFLOPS > PA8000: egcs-2.91.42 -O3 : 97.10 MFLOPS > PA8000: cc +DA1.1 -Ae +O4 : 129.47 MFLOPS > PA8000: cc +DA2.0 -Ae +O4 : 216.62 MFLOPS > > egcs faster on PA8000 and slower on PA7200 than gcc-2.7.2. > cc is faster du to a better support of special instructions. Err, you got that backwards :-) egcs is faster than gcc2 on the PA7200, but slower on the PA8000 series. Note that you can get about a 30% improvement in this code on a PA8000 by disabling the fmpyadd/fmpysub instructions. They're reorder buffer killers. In fact, if someone wanted to submit a patch which added flags for PA2.0 scheduling and codegen I'd accept it -- even if it did nothing at this point. Just having the flags allows us to start experimenting with the code gen issues. > Is there a planed support for PA2.0 on HP? I'd like to do it, but I don't have the time. I'd happily accept contributions. Note first you have to add PA2.0 support in bfd/binutils/gas if you're going to use any of the new instructions. jeff