[Ilugc] -O4 optimization with gcc 4.7
- From: a.kumar@xxxxxxxxxxxxxxxxx (Kumar Appaiah)
- Date: Mon, 30 Sep 2013 06:12:27 -0400
On Mon, Sep 30, 2013 at 02:11:11PM +0530, km wrote:
Dear All,
I have seen this -O4 optimization being used in latest c/c++ soursecode but
find no documentation on the use of O4 over O3 level.
Can someone comment on this. Does it improve runtime performance over O3 ?
Anything beyond -O3 has no effect other than -O3's effect. You can
check these options at the source:
http://gcc.gnu.org/git/?p=gcc.git;a=blob;f=gcc/opts.c#l471
Kumar
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