From: Antriksh Pany <antriksh.pany@gmail.com>
To: Dan McGee <dpmcgee@gmail.com>
Cc: Junio C Hamano <gitster@pobox.com>,
git@vger.kernel.org, Erik Faye-Lund <kusmabite@gmail.com>
Subject: Re: [PATCH 4/5] tree-walk: unroll get_mode since loop boundaries are well-known
Date: Tue, 5 Apr 2011 16:55:24 -0700 [thread overview]
Message-ID: <BANLkTin9P-OdTQhPTwcvgvpDoBg7E+va5Q@mail.gmail.com> (raw)
In-Reply-To: <BANLkTi==M=N+Z3qcsYk+tHap8A1Y41QfLw@mail.gmail.com>
On Mon, Apr 4, 2011 at 10:33 PM, Dan McGee <dpmcgee@gmail.com> wrote:
> ....
> Totally agree; I should have tried to do it this way in the first
> place. However, compiling the fixed-length 0 to 5 loop does not
> produce fully-unrolled assembly for me with CFLAGS="-march=native
> -mtune=native -O2 -pipe -g" on x86_64. I see two copies of the loop
> only, and even worse is the (lack of) performance (each is the mode of
> 3 runs). Compilers are stupid apparently.
> ....
Can you try -O3? Or an explicit '-funroll-loops'?
gcc I think does not do aggressive speed optimizations at the cost of
space when at O2.
Cheers
Antriksh
next prev parent reply other threads:[~2011-04-05 23:56 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-31 1:37 [PATCH 1/5] diff_tree_sha1: skip diff_tree if old == new Dan McGee
2011-03-31 1:37 ` [PATCH 2/5] tree-walk: drop unused parameter from match_dir_prefix Dan McGee
2011-08-30 18:55 ` Dan McGee
2011-03-31 1:37 ` [PATCH 3/5] tree-walk: micro-optimization in tree_entry_interesting Dan McGee
2011-04-03 4:01 ` Nguyen Thai Ngoc Duy
2011-04-03 18:55 ` Junio C Hamano
2011-04-05 0:22 ` Dan McGee
[not found] ` <CAEik5nOKrpFycZYVnSu4_5LYWxn0JS_hVXyiQH-80Bu-C4k8VQ@mail.gmail.com>
2011-08-30 19:51 ` Dan McGee
2011-08-30 20:40 ` Junio C Hamano
2011-09-09 2:02 ` [PATCH 1/2] tree-walk: drop unused parameter from match_dir_prefix Dan McGee
2011-09-09 2:02 ` [PATCH 2/2] tree-walk: micro-optimization in tree_entry_interesting Dan McGee
2011-04-04 14:46 ` [PATCH] tree_entry_interesting: inline strncmp() Nguyễn Thái Ngọc Duy
2011-03-31 1:38 ` [PATCH 4/5] tree-walk: unroll get_mode since loop boundaries are well-known Dan McGee
2011-04-02 9:28 ` Nguyen Thai Ngoc Duy
2011-04-02 17:28 ` Dan McGee
2011-04-03 4:07 ` Nguyen Thai Ngoc Duy
2011-04-04 10:29 ` Erik Faye-Lund
2011-04-04 12:30 ` Andreas Ericsson
2011-04-04 16:55 ` Junio C Hamano
2011-04-05 5:33 ` Dan McGee
2011-04-05 23:55 ` Antriksh Pany [this message]
2011-04-06 20:45 ` Dan McGee
2011-03-31 1:38 ` [PATCH 5/5] tree-walk: match_entry microoptimization Dan McGee
2011-04-02 9:06 ` Nguyen Thai Ngoc Duy
2011-04-02 17:54 ` Dan McGee
2011-03-31 12:58 ` [PATCH 1/5] diff_tree_sha1: skip diff_tree if old == new Nguyen Thai Ngoc Duy
2011-03-31 13:56 ` Dan McGee
2011-04-01 22:28 ` Junio C Hamano
[not found] ` <AANLkTinPSqDPdGi5nA3sH1D2wMSW1SQc+5gRqdLy++y0@mail.gmail.com>
2011-04-02 18:38 ` Fwd: " Dan McGee
2011-05-03 7:34 ` Nguyen Thai Ngoc Duy
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