[Bug optimization/12209] [3.4 Regression] GCC fails to bootstrap Cygwin with -funit-at-a-time

[hubicka at ucw dot cz]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12209



------- Additional Comments From hubicka at ucw dot cz  2003-10-08 08:30 -------
Subject: Re:  [3.4 Regression] GCC fails to bootstrap Cygwin with -funit-at-a-time

> PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.
> 
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12209
> 
> 
> 
> ------- Additional Comments From dannysmith at gcc dot gnu dot org  2003-10-08 07:51 -------
> This bug appears to be the same as __attribute__((regparm())  vs  the
> stack probing code (cygwin.asm)  reported here (with testcase):
> 
> http://www.cygwin.com/ml/cygwin/2002-06/msg00122.html
> 
> If change regparm(3) to fastcall in  the above testcase, it succeeds.
> fastcall use ECX not EAX as the first allocated register.

OK, when exactly stack probing happens?  I think we have two choices.
Either disqualify regparm (at least emit warning on it) and modify
unit-at-a-time code or fix stack probing somehow.  What sounds as better
approach?

Honza
> 
> Danny
> 
> 
> 
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