Silent gcc 4.2.0 loop optimization bug with -O2

Sascha Holzleiter sascha at holzleiter.name
Mon Jun 25 20:41:40 UTC 2007


On Mon, 2007-06-25 at 08:48 -0700, Garrett Cooper wrote:
>     It's covered in gcc 4.2.1 AFAIK because it's the same / similar to 
> the bug with xorg-server's scanpci.c.
> 
>     Before pursuing your filed bug too much, please switch over to the 
> gcc 4.2.1 snapshot provided by Kris a week back, compile stuff, and see 
> if the error persists.

Just a quick test as i just happen to have the new patch running on this
box:

(aperum at dreamland) /home/aperum> cc -O2 a.c
(aperum at dreamland) /home/aperum> ./a.out 
(aperum at dreamland) /home/aperum> cc -O1 a.c
(aperum at dreamland) /home/aperum> ./a.out   
MUST BE HERE!!! 7
MUST BE HERE!!! 8
MUST BE HERE!!! 9

(aperum at dreamland) /home/aperum> cc -v
Using built-in specs.
Target: amd64-undermydesk-freebsd
Configured with: FreeBSD/amd64 system compiler
Thread model: posix
gcc version 4.2.1 20070614 prerelease [FreeBSD]

So this doesn't seem to be fixed with Kris' snapshot.


-- 
  Sascha



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