[Bug optimization/14863] [3.4 regression] unit-at-a-time causes miscompilation

["rguenth at tat dot physik dot uni-tuebingen dot de" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From rguenth at tat dot physik dot uni-tuebingen dot de  2004-04-07 12:04 -------
Subject: Re:  [3.4 regression] unit-at-a-time causes
 miscompilation

On Wed, 7 Apr 2004, 1319 at bot dot ru wrote:

>
> ------- Additional Comments From 1319 at bot dot ru  2004-04-07 11:55 -------
> I have just found that this bug can be triggered on/off using --param
> large-function-insns=<something> option. Default value of this changed from
> 10000 before gcc-3_4-branch creation to 3000 shortly after.
>
> All versions of 3.4.0 and 3.5.0 I tried (20040116..now) are OK with '-O1
> -funit-at-a-time --param large-function-insns=10000' and all failed with '-O1
> -funit-at-a-time --param large-function-insns=3000'.

Yes, it sounds the bug is triggered by (not) inlining some special
function somewhere special.  At least I didn't find an optimization
switch, if disabled, that cures the failure at -O1 -funit-at-a-time.

Testcase is still minimizing (slowly).

Richard.

--
Richard Guenther <richard dot guenther at uni-tuebingen dot de>
WWW: http://www.tat.physik.uni-tuebingen.de/~rguenth/


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14863