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Mail Archives: cygwin-developers/2001/10/22/23:35:23

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Message-ID: <039401c15b74$3555bd70$0200a8c0@lifelesswks>
From: "Robert Collins" <robert DOT collins AT itdomain DOT com DOT au>
To: "Robert Collins" <robert DOT collins AT itdomain DOT com DOT au>,
<cygwin-developers AT cygwin DOT com>
References: <20011022142729 DOT A10309 AT redhat DOT com> <20011022192430 DOT 3581 DOT qmail AT lizard DOT curl DOT com> <20011022193036 DOT 3609 DOT qmail AT lizard DOT curl DOT com> <20011022203136 DOT 5144 DOT qmail AT lizard DOT curl DOT com> <20011022203747 DOT 5162 DOT qmail AT lizard DOT curl DOT com> <02a201c15b5b$7910a4d0$0200a8c0 AT lifelesswks> <20011022204740 DOT B18754 AT redhat DOT com> <20011023005236 DOT 7136 DOT qmail AT lizard DOT curl DOT com> <20011022205828 DOT C18754 AT redhat DOT com> <02ea01c15b5f$7e673bc0$0200a8c0 AT lifelesswks> <20011022212759 DOT A19493 AT redhat DOT com> <035a01c15b6b$e7788c70$0200a8c0 AT lifelesswks>
Subject: Re: 1.3.4 status?
Date: Tue, 23 Oct 2001 13:38:37 +1000
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This doesn't fix it.

It's probably worth doing the syscall alteration regardless though, for
performance on no-ops.

The real culprit is -finline-functions which is enabled
by -O3. -O3 -fno-inline-functions generates good (From a casual eyeball)
code. Jonathan: care to confirm this?

I'm having a casual look into why. Interestingly enough, the _chkstk
call goes away with -fno-inline-functions.

(the -fno-inline-functions does not disable all inlineing, just
automatic inlining of non 'inline' declared functions that weren't
implemented in the class definition).

Rob

----- Original Message -----
From: "Robert Collins" <robert DOT collins AT itdomain DOT com DOT au>
To: <cygwin-developers AT cygwin DOT com>
Sent: Tuesday, October 23, 2001 12:39 PM
Subject: Re: 1.3.4 status?


> What about this:
>
> Index: fhandler_console.cc
> ===================================================================
> RCS file: /cvs/src/src/winsup/cygwin/fhandler_console.cc,v
> retrieving revision 1.66
> diff -u -p -r1.66 fhandler_console.cc
> --- fhandler_console.cc 2001/10/22 18:39:22     1.66
> +++ fhandler_console.cc 2001/10/23 02:35:14
> @@ -198,9 +198,6 @@ fhandler_console::set_cursor_maybe ()
>  int
>  fhandler_console::read (void *pv, size_t buflen)
>  {
> -  if (!buflen)
> -    return 0;
> -
>    HANDLE h = get_io_handle ();
>
>  #define buf ((char *) pv)
> Index: syscalls.cc
> ===================================================================
> RCS file: /cvs/src/src/winsup/cygwin/syscalls.cc,v
> retrieving revision 1.162
> diff -u -p -r1.162 syscalls.cc
> --- syscalls.cc 2001/10/22 18:31:00     1.162
> +++ syscalls.cc 2001/10/23 02:35:15
> @@ -290,6 +290,9 @@ _read (int fd, void *ptr, size_t len)
>    if (__check_null_invalid_struct_errno (ptr, len))
>      return -1;
>
> +  if (!len)
> +    return 0;
> +
>    int res;
>    extern int sigcatchers;
>    int e = get_errno ();
>
> Check http://www.opengroup.org/onlinepubs/7908799/xsh/read.html if
> interested.
>
> Rob
>
>

- Raw text -


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