kind of regression -fprofile-* between r126538 and r126587

[Janis Johnson]

On Thu, 2007-07-12 at 20:54 +0200, Thomas Veith wrote:
> Hi *,
> 
> when compiling crafty-20.14 with
> 
> CFLAGS='$(CFLAGS) -Wall -pipe -D_REENTRANT -march=i686 -O3 \
>                    -fprofile-use -fbranch-probabilities -fomit-frame-pointer \
>                    -ftree-vectorize -ftree-vectorizer-verbose=1 -msse2 \
>                    -fno-gcse -mpreferred-stack-boundary=2'
> 
> with rev. 125687 crafty breaks severly -- with rev. 126538 it compiles and 
> runs smoothly.

How does it break?  I tried building crafty from SPEC CPU2000 on
powerpc-linux with -fprofile-generate/-use and various other
optimizations with current mainline and found that with feedback
plus -O1 the resulting program hangs with the test (short) input.

> As you can see, there are a lot of options involved and crafty is a big 
> program so I'm not able to provide a reduced testcase and file a PR in 
> bugzilla. But maybe someone can take this as a hint.

I don't have time right now to look into it, either.

Janis