[Ilugc] -O4 optimization with gcc 4.7

• From: mohan43u@xxxxxxxxx (Mohan R)
• Date: Mon, 30 Sep 2013 14:31:18 +0530

On Mon, 2013-09-30 at 14:11 +0530, km wrote:

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.

Which c/c++ sourcecode you see O4 optimization? AFAIK, there is,

-O0 - For debugging
-O1 - optimize
-O2 - optimize more
-O3 - optimize most
-Os - optimize for size
-Ofast - non-standard optimization

See man gcc(1). Anything above -O3 is just -O3[1].

1.http://stackoverflow.com/questions/1778538/how-many-gcc-optimization-levels-are-there

Thanks,
Mohan R

• References:
  • [Ilugc] -O4 optimization with gcc 4.7
    • From: km

Other related posts:

• » [Ilugc] -O4 optimization with gcc 4.7- km
• » [Ilugc] -O4 optimization with gcc 4.7- Girish Venkatachalam
• » [Ilugc] -O4 optimization with gcc 4.7 - Mohan R
• » [Ilugc] -O4 optimization with gcc 4.7- Kumar Appaiah

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