| To: | Richard Henderson <rth@redhat.com>, "Maciej W. Rozycki" <macro@linux-mips.org>, Richard Sandiford <rsandifo@redhat.com>, gcc-patches@gcc.gnu.org, linux-mips@linux-mips.org |
|---|---|
| Subject: | Re: [patch] MIPS/gcc: Revert removal of DImode shifts for 32-bit targets |
| From: | Ralf Baechle <ralf@linux-mips.org> |
| Date: | Fri, 23 Jul 2004 23:12:32 +0200 |
| In-reply-to: | <20040723202703.GB30931@redhat.com> |
| Original-recipient: | rfc822;linux-mips@linux-mips.org |
| References: | <Pine.LNX.4.55.0407191648451.3667@jurand.ds.pg.gda.pl> <87hds49bmo.fsf@redhat.com> <Pine.LNX.4.55.0407191907300.3667@jurand.ds.pg.gda.pl> <20040719213801.GD14931@redhat.com> <Pine.LNX.4.55.0407201505330.14824@jurand.ds.pg.gda.pl> <20040723202703.GB30931@redhat.com> |
| Sender: | linux-mips-bounce@linux-mips.org |
| User-agent: | Mutt/1.4.1i |
On Fri, Jul 23, 2004 at 01:27:03PM -0700, Richard Henderson wrote: > > Sometimes putting these eight (or nine for ashrdi3) instructions > > inline would be a performance win. > > Sometimes, maybe. I suspect you'll find that in general it's > nothing but bloat. With a bit of hand waiving because haven't done benchmarks I guess Richard might be right. The subroutine calling overhead on modern processors is rather low and smaller code means better cache hit rates ... Ralf |
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