Re: c/5914: Infinite loop when compiling with optimisation on of z_log.c of libf2c

Re: c/5914: Infinite loop when compiling with optimisation on of z_log.c of libf2c

[toon]

Synopsis: Infinite loop when compiling with optimisation on of z_log.c of libf2c

State-Changed-From-To: feedback->closed
State-Changed-By: toon
State-Changed-When: Sat Mar 16 07:56:48 2002
State-Changed-Why:
    Code can be compiled correctly with -ffloat-store for all
    versions of the compiler mentioned in this bug-report.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=5914

Re: c/5914: Infinite loop when compiling with optimisation on of z_log.c of libf2c

[Toon Moene]

The following reply was made to PR c/5914; it has been noted by GNATS.

From: Toon Moene <toon@moene.indiv.nluug.nl>
To: Ulrich Jakobus <jakobus@emss.co.za>
Cc: "gcc-bugs@gcc.gnu.org" <gcc-bugs@gcc.gnu.org>,
 	"gcc-gnats@gcc.gnu.org" <gcc-gnats@gcc.gnu.org>,
 	"gcc-prs@gcc.gnu.org" <gcc-prs@gcc.gnu.org>,
 	"nobody@gcc.gnu.org" <nobody@gcc.gnu.org>,
 	"toon@gcc.gnu.org" <toon@gcc.gnu.org>
Subject: Re: c/5914: Infinite loop when compiling with optimisation on of z_log.c 
 of libf2c
Date: Wed, 13 Mar 2002 21:04:38 +0100

 Ulrich Jakobus wrote:
 
 > I wrote:
 
 > >Ah, now I see - you really meant this a *C* bug report :-)
 
 > Yes, I meant this to be a *C* bug of the optimiser (and I
 > submitted it as a C bug). Obviously the created code with
 > -O2 or -O3 is not correct, resulting in an infinite loop.
 > Compiling exactly the same code with -O works, and also
 > using e.g. gcc-2.95.2 with -O2 or -O3 works fine.
 
 Oh, perhaps you think that this is a regression w.r.t. 2.95.2 - it
 isn't.  The fact that 2.95.2 happened to compile this "correctly" is
 purely by chance.  In general, if you code a floating point
 fixed-point-finder by comparing one estimate with the other for
 equality, you'll lose on such targets as the x86, because it keeps
 variables in registers with a different precision than the corresponding
 memory location.
 
 -ffloat-store is the flag to use to circumvent this problem.
 
 -- 
 Toon Moene - mailto:toon@moene.indiv.nluug.nl - phoneto: +31 346 214290
 Saturnushof 14, 3738 XG  Maartensdijk, The Netherlands
 Maintainer, GNU Fortran 77: http://gcc.gnu.org/onlinedocs/g77_news.html
 Join GNU Fortran 95: http://g95.sourceforge.net/ (under construction)

Re: c/5914: Infinite loop when compiling with optimisation on of z_log.c of libf2c

[Ulrich Jakobus]

The following reply was made to PR c/5914; it has been noted by GNATS.

From: "Ulrich Jakobus" <jakobus@emss.co.za>
To: "Toon Moene" <toon@moene.indiv.nluug.nl>
Cc: "gcc-bugs@gcc.gnu.org" <gcc-bugs@gcc.gnu.org>,
	"gcc-gnats@gcc.gnu.org" <gcc-gnats@gcc.gnu.org>,
	"gcc-prs@gcc.gnu.org" <gcc-prs@gcc.gnu.org>,
	"nobody@gcc.gnu.org" <nobody@gcc.gnu.org>,
	"toon@gcc.gnu.org" <toon@gcc.gnu.org>
Subject: Re: c/5914: Infinite loop when compiling with optimisation on of z_log.c of libf2c
Date: Wed, 13 Mar 2002 06:59:50 +0200

 >
 >Ah, now I see - you really meant this a *C* bug report :-)
 >
 Yes, I meant this to be a *C* bug of the optimiser (and I
 submitted it as a C bug). Obviously the created code with
 -O2 or -O3 is not correct, resulting in an infinite loop.
 Compiling exactly the same code with -O works, and also 
 using e.g. gcc-2.95.2 with -O2 or -O3 works fine.
 
 >Now that you know how to work around the problem, can I close the report?
 
 Well, I already knew before submitting the issue that if I 
 use just -O it works. If you think it is not important that
 also gcc-3.0.4 gives correct code (as gcc-2.95.2 did for in-
 stance) when using -O2 or -O3 you are welcome to close the issue.
 
 Thanks,
 
 Ulrich
 
 
 

Re: c/5914: Infinite loop when compiling with optimisation on of z_log.c of libf2c

[Toon Moene]

The following reply was made to PR c/5914; it has been noted by GNATS.

From: Toon Moene <toon@moene.indiv.nluug.nl>
To: Ulrich Jakobus <jakobus@emss.co.za>
Cc: "gcc-bugs@gcc.gnu.org" <gcc-bugs@gcc.gnu.org>,
 	"gcc-gnats@gcc.gnu.org" <gcc-gnats@gcc.gnu.org>,
 	"gcc-prs@gcc.gnu.org" <gcc-prs@gcc.gnu.org>,
 	"nobody@gcc.gnu.org" <nobody@gcc.gnu.org>,
 	"toon@gcc.gnu.org" <toon@gcc.gnu.org>
Subject: Re: c/5914: Infinite loop when compiling with optimisation on of z_log.c 
 of libf2c
Date: Tue, 12 Mar 2002 21:15:36 +0100

 Ulrich Jakobus wrote:
 
 > I wrote:
 
 > >    Why are you submitting this ?
 
 > OK, now I know that I should probably use "-O2 -ffloat-store" for
 > the compilation, and not "-O3" or just "-O2" (which I have always
 > done for previous releases of gcc).
 
 Ah, now I see - you really meant this a *C* bug report :-)
 
 Now that you know how to work around the problem, can I close the report
 ?
 
 Thanks in advance,
 
 -- 
 Toon Moene - mailto:toon@moene.indiv.nluug.nl - phoneto: +31 346 214290
 Saturnushof 14, 3738 XG  Maartensdijk, The Netherlands
 Maintainer, GNU Fortran 77: http://gcc.gnu.org/onlinedocs/g77_news.html
 Join GNU Fortran 95: http://g95.sourceforge.net/ (under construction)

Re: c/5914: Infinite loop when compiling with optimisation on of z_log.c of libf2c

[Ulrich Jakobus]

The following reply was made to PR c/5914; it has been noted by GNATS.

From: "Ulrich Jakobus" <jakobus@emss.co.za>
To: "gcc-bugs@gcc.gnu.org" <gcc-bugs@gcc.gnu.org>,
	"gcc-gnats@gcc.gnu.org" <gcc-gnats@gcc.gnu.org>,
	"gcc-prs@gcc.gnu.org" <gcc-prs@gcc.gnu.org>,
	"jakobus@emss.co.za" <jakobus@emss.co.za>,
	"nobody@gcc.gnu.org" <nobody@gcc.gnu.org>,
	"toon@gcc.gnu.org" <toon@gcc.gnu.org>
Cc:  
Subject: Re: c/5914: Infinite loop when compiling with optimisation on of z_log.c of libf2c
Date: Tue, 12 Mar 2002 07:13:05 +0200

 >    
 >    Why are you submitting this ?
 >
 Sorry, may be a misunderstanding: I am using gcc-3.0.4 to compile
 the file z_log.c of libf2c myself, I am not referring to g77 and
 libf2c that comes with g77. I need my own version of libf2c for
 several reasons (modified variable mappings in the header file f2c.h
 and certain other defines in the makefiles deviating from the standard).
 
 OK, now I know that I should probably use "-O2 -ffloat-store" for
 the compilation, and not "-O3" or just "-O2" (which I have always
 done for previous releases of gcc).
 
 Thanks,
 
 Ulrich
 
 
 

Re: c/5914: Infinite loop when compiling with optimisation on of z_log.c of libf2c

[toon]

Synopsis: Infinite loop when compiling with optimisation on of z_log.c of libf2c

Responsible-Changed-From-To: unassigned->toon
Responsible-Changed-By: toon
Responsible-Changed-When: Mon Mar 11 13:59:52 2002
Responsible-Changed-Why:
    Fortran run time library - my job.
State-Changed-From-To: open->feedback
State-Changed-By: toon
State-Changed-When: Mon Mar 11 13:59:52 2002
State-Changed-Why:
    While this is true, as of gcc/g77-3.0.3 this file is
    compiled with -O2 -ffloat-store, which solves the problem.
    
    Why are you submitting this ?

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=5914

Re: c/5914: Infinite loop when compiling with optimisation on of z_log.c of libf2c

[Tim Prince]

The following reply was made to PR c/5914; it has been noted by GNATS.

From: Tim Prince <tprince@computer.org>
To: jakobus@emss.co.za, gcc-gnats@gcc.gnu.org
Cc:  
Subject: Re: c/5914: Infinite loop when compiling with optimisation on of z_log.c of libf2c
Date: Mon, 11 Mar 2002 13:10:26 -0800

 On Monday 11 March 2002 07:46, jakobus@emss.co.za wrote:
 > >Number:         5914
 > >Category:       c
 > >Synopsis:       Infinite loop when compiling with optimisation on of
 > > z_log.c of libf2c Confidential:   no
 > >Severity:       serious
 > >Priority:       medium
 > >Responsible:    unassigned
 > >State:          open
 > >Class:          wrong-code
 > >Submitter-Id:   net
 > >Arrival-Date:   Mon Mar 11 07:56:01 PST 2002
 > >Closed-Date:
 > >Last-Modified:
 > >Originator:     Ulrich Jakobus
 > >Release:        3.0.4
 > >Organization:
 > >Environment:
 >
 > System: Linux uj-emss 2.2.16 #1 Wed Aug 2 20:22:26 GMT 2000 i686 unknown
 > Architecture: i686
 >
 >
 > host: i686-pc-linux-gnu
 > build: i686-pc-linux-gnu
 > target: i686-pc-linux-gnu
 > configured with: ../gcc-3.0.4/configure
 >
 > >Description:
 >
 >     	Compiling the attached simple and short example file z_log.c (taken
 > from libf2c with specific input parameters) works fine for gcc-2.95.2 with
 > all levels of optimisation. For gcc-3.0.4 it also works for -O, but for -O2
 > or higher we end up in an infinite loop.
 >
 > >How-To-Repeat:
 >
 > 	gcc -O2 z_log.c
 >
 > >Fix:
 >
 Didn't Toon Moene already work on this?  Isn't this a loop at execution 
 time?
 -- 
 Tim Prince

c/5914: Infinite loop when compiling with optimisation on of z_log.c of libf2c

[jakobus]

>Number:         5914
>Category:       c
>Synopsis:       Infinite loop when compiling with optimisation on of z_log.c of libf2c
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          wrong-code
>Submitter-Id:   net
>Arrival-Date:   Mon Mar 11 07:56:01 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     Ulrich Jakobus
>Release:        3.0.4
>Organization:
>Environment:
System: Linux uj-emss 2.2.16 #1 Wed Aug 2 20:22:26 GMT 2000 i686 unknown
Architecture: i686

	
host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: i686-pc-linux-gnu
configured with: ../gcc-3.0.4/configure 
>Description:
    	Compiling the attached simple and short example file z_log.c (taken from
        libf2c with specific input parameters) works fine for gcc-2.95.2 with all
        levels of optimisation. For gcc-3.0.4 it also works for -O, but for -O2 or
        higher we end up in an infinite loop.
>How-To-Repeat:
	gcc -O2 z_log.c
>Fix:
	


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`
end
>Release-Note:
>Audit-Trail:
>Unformatted: