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From: Wolfgang Bangerth <bangerth@ticam.utexas.edu> To: nobody@gcc.gnu.org Cc: gcc-prs@gcc.gnu.org, Subject: Re: optimization/5477: gcc 3.0.x reserves a large stack frame, but uses only some parts of it Date: Mon, 17 Mar 2003 23:56:00 -0000 [thread overview] Message-ID: <20030317235601.4866.qmail@sources.redhat.com> (raw) The following reply was made to PR optimization/5477; it has been noted by GNATS. From: Wolfgang Bangerth <bangerth@ticam.utexas.edu> To: Klaus Espenlaub <espenlaub@informatik.uni-ulm.de> Cc: gcc-bugs@gcc.gnu.org, <gcc-gnats@gcc.gnu.org> Subject: Re: optimization/5477: gcc 3.0.x reserves a large stack frame, but uses only some parts of it Date: Mon, 17 Mar 2003 17:48:32 -0600 (CST) > > State-Changed-From-To: open->feedback > > State-Changed-Why: > > Klaus, for unknown reasons the attachment I find in the > > report doesn't have a main() function -- thus no checking > > possible. Do you still have the program so that you can > > send it to me? I'll attach it to the report then. > [...] > It doesn't make much sense in this context to have a fully compilable piece of > code, since the problem is not that the resulting program fails to compile or > fails to run, but that it uses one order of magniture more stack space than it > would need to. My apologies -- late night staring at PRs doesn't improve my ability to think. I think it just didn't get into my head to look at assembly output. > Another comment on the base problem: the compiler bug seems to be fixed in > gcc-3.2. There might still be room for improvement, but the current stack > consumption is quite acceptable: gcc-3.0 reserved 380 bytes of stack space, > while gcc-3.2 reserves only 28. For me, its either 60 bytes or 44 bytes (with -DPUTCHAR_MACRO) for 3.2.2, present 3.3 and mainline. Not all of these stack slots seems to be used. What do you suggest we do with the report? W. ------------------------------------------------------------------------- Wolfgang Bangerth email: bangerth@ticam.utexas.edu www: http://www.ticam.utexas.edu/~bangerth/
next reply other threads:[~2003-03-17 23:56 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2003-03-17 23:56 Wolfgang Bangerth [this message] -- strict thread matches above, loose matches on Subject: below -- 2003-03-17 10:36 Klaus Espenlaub 2003-03-15 4:38 bangerth 2002-01-24 1:06 espenlaub
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