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Re: Optimising for size

From: Joe Buck <Joe dot Buck at synopsys dot COM>
To: zoltan at bendor dot com dot au
Cc: gcc at gcc dot gnu dot org
Date: Sun, 13 Jul 2008 21:02:43 -0700
Subject: Re: Optimising for size
References: <Pine.LNX.4.31.0807140949200.26704-100000@susu.bendor.com.au>

On Mon, Jul 14, 2008 at 10:04:08AM +1000, zoltan@bendor.com.au wrote:
> I have a piece of C code. The code, compiled to an ARM THUMB target using
> gcc 4.0.2, with -Os results in 230 instructions. The exact same code,
> using the exact same switches compiles to 437 instructions with gcc 4.3.1.
> Considering that the compiler optimises to size and the much newer
> compiler emits almost twice as much code as the old one, I think it is an
> issue.

Agreed.  I think it's a regression.  Using -Os and getting
much larger code would qualify.

> So the question is, how should I report it?

Open a PR with the complete test case, and the command line options you
used with 4.0.2 and 4.3.1.

Follow-Ups:
- Re: Optimising for size
  - From: Joel Sherrill

References:
- Optimising for size
  - From: zoltan

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