Re: c/9502: shift of long long broken

Re: c/9502: shift of long long broken

[ebotcazou]

Synopsis: shift of long long broken

State-Changed-From-To: open->closed
State-Changed-By: ebotcazou
State-Changed-When: Wed Jan 29 20:02:24 2003
State-Changed-Why:
    Not a bug. You need to write:
    unsigned long long int a = 1ULL << 32;

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9502

Re: c/9502: shift of long long broken

[Andrew Pinski]

The following reply was made to PR c/9502; it has been noted by GNATS.

From: Andrew Pinski <apinski@apple.com>
To: roger.dahl@am.sony.com
Cc: gcc-gnats@gcc.gnu.org
Subject: Re: c/9502: shift of long long broken
Date: Wed, 29 Jan 2003 10:37:29 -0800

 The warning is right, 1 is not a long long but just an int.
 Use C99 way of say 1 is a long long by LL.
 
 Thanks,
 Andrew Pinski
 
 
 On Wednesday, Jan 29, 2003, at 10:13 US/Pacific, roger.dahl@am.sony.com 
 wrote:
 
 >
 >> Number:         9502
 >> Category:       c
 >> Synopsis:       shift of long long broken
 >> Confidential:   no
 >> Severity:       serious
 >> Priority:       medium
 >> Responsible:    unassigned
 >> State:          open
 >> Class:          sw-bug
 >> Submitter-Id:   net
 >> Arrival-Date:   Wed Jan 29 18:16:00 UTC 2003
 >> Closed-Date:
 >> Last-Modified:
 >> Originator:     roger.dahl@am.sony.com
 >> Release:        3.2 and 2.96
 >> Organization:
 >> Environment:
 > DJGPP MS-DOS (3.2), GCC Linux (2.96)
 >> Description:
 > Shift in assignment fails when type is long long and shift argument is 
 > > 31
 >> How-To-Repeat:
 > unsigned long long int a = 1 << 32;
 >
 > Note the compiler warning message and the resulting code.
 >> Fix:
 > unsigned long long int a = 1;
 > a <<= 32;
 >> Release-Note:
 >> Audit-Trail:
 >> Unformatted:
 >
 

Re: c/9502: shift of long long broken

[Graham Stott]

The following reply was made to PR c/9502; it has been noted by GNATS.

From: Graham Stott <graham.stott@btinternet.com>
To: roger.dahl@am.sony.com
Cc: gcc-gnats@gcc.gnu.org
Subject: Re: c/9502: shift of long long broken
Date: Wed, 29 Jan 2003 18:27:30 +0000

 Not a bug your example is broken.
 
 You are shifting "1" which is an int.
 
 The fact that "a" is long long make no difference here.
 
 You need to use 1LL to specify that is a long long "1".
 
 Graham
 

c/9502: shift of long long broken

[roger.dahl]

>Number:         9502
>Category:       c
>Synopsis:       shift of long long broken
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Jan 29 18:16:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     roger.dahl@am.sony.com
>Release:        3.2 and 2.96
>Organization:
>Environment:
DJGPP MS-DOS (3.2), GCC Linux (2.96)
>Description:
Shift in assignment fails when type is long long and shift argument is > 31
>How-To-Repeat:
unsigned long long int a = 1 << 32;

Note the compiler warning message and the resulting code.
>Fix:
unsigned long long int a = 1;
a <<= 32;
>Release-Note:
>Audit-Trail:
>Unformatted: