GNU bug report logs - #23474
Gzip and CFLAGS

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From: Tom Smith <gnuacc2016 <at> gmail.com>
To: 23474 <at> debbugs.gnu.org
Subject: bug#23474: Gzip and CFLAGS
Date: Fri, 6 May 2016 21:15:15 -0400

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Hello there,


            After having compiled gzip, I had looked at the Makefile
“./configure” generated.

            Looking at CFLAGS=”” (system configuration section), not many
compiler flags are specified for optimization.

            The “Specific Targets” section sets different flags for
different systems, which are set accordingly.

            Currently, I am looking at “CFLAGS= -O”.


            I noticed that some optimization flags were not set (curious as
to why):

-         -march=native (pentium3, athlon64, etc) (produces code for the
specific architecture specified)

-         -O2 (recommended level to use to increase code performance )

-         -pipe (makes compilation process faster)

-         -fomit-frame-pointer (reduces generated code size)


Also, I found this article
http://lists.gnu.org/archive/html/bug-gzip/2013-02/msg00000.html and it
mentions setting –O2 and encountering an issue (it has since been fixed).

After running some tests after I recompiled (Linux), sometimes I noticed it
to be a little bit faster (at times) on x86_64.

Note: There are many different conditions that cause the numbers to
fluctuate, such as: # of processes running, ram usage, CPU power etc.




Thank You

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