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* [Bug c/37261] New: Spurious (?) "integer overflow in expression" warnings @ 2008-08-27 23:46 roland at digitalvampire dot org 2008-08-28 9:17 ` [Bug c/37261] [4.3/4.4 Regression] " rguenth at gcc dot gnu dot org ` (5 more replies) 0 siblings, 6 replies; 7+ messages in thread From: roland at digitalvampire dot org @ 2008-08-27 23:46 UTC (permalink / raw) To: gcc-bugs With: $ gcc --version gcc (Debian 4.3.1-2) 4.3.1 running on x86-64, the code below produces seemingly spurious warnings about integer overflow: $ LANG=C gcc -c b.c b.c: In function 'foo': b.c:3: warning: integer overflow in expression b.c:5: warning: integer overflow in expression $ cat b.c unsigned foo(int x) { return ((x & 1) | 2) & 0x80000000; return ((x & 2) | 2) & 0x80000000; return ((x & 4) | 2) & 0x80000000; } -- Summary: Spurious (?) "integer overflow in expression" warnings Product: gcc Version: 4.3.1 Status: UNCONFIRMED Severity: minor Priority: P3 Component: c AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: roland at digitalvampire dot org GCC build triplet: x86_64-linux-gnu GCC host triplet: x86_64-linux-gnu GCC target triplet: x86_64-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37261 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c/37261] [4.3/4.4 Regression] Spurious (?) "integer overflow in expression" warnings 2008-08-27 23:46 [Bug c/37261] New: Spurious (?) "integer overflow in expression" warnings roland at digitalvampire dot org @ 2008-08-28 9:17 ` rguenth at gcc dot gnu dot org 2008-08-29 11:57 ` jakub at gcc dot gnu dot org ` (4 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: rguenth at gcc dot gnu dot org @ 2008-08-28 9:17 UTC (permalink / raw) To: gcc-bugs ------- Comment #1 from rguenth at gcc dot gnu dot org 2008-08-28 09:16 ------- Confirmed. -- rguenth at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Ever Confirmed|0 |1 Keywords| |diagnostic Known to fail| |4.3.1 Known to work| |4.2.4 Last reconfirmed|0000-00-00 00:00:00 |2008-08-28 09:16:34 date| | Summary|Spurious (?) "integer |[4.3/4.4 Regression] |overflow in expression" |Spurious (?) "integer |warnings |overflow in expression" | |warnings Target Milestone|--- |4.3.3 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37261 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c/37261] [4.3/4.4 Regression] Spurious (?) "integer overflow in expression" warnings 2008-08-27 23:46 [Bug c/37261] New: Spurious (?) "integer overflow in expression" warnings roland at digitalvampire dot org 2008-08-28 9:17 ` [Bug c/37261] [4.3/4.4 Regression] " rguenth at gcc dot gnu dot org @ 2008-08-29 11:57 ` jakub at gcc dot gnu dot org 2008-08-29 12:24 ` jakub at gcc dot gnu dot org ` (3 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: jakub at gcc dot gnu dot org @ 2008-08-29 11:57 UTC (permalink / raw) To: gcc-bugs ------- Comment #2 from jakub at gcc dot gnu dot org 2008-08-29 11:55 ------- Testing a fix. -- jakub at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- AssignedTo|unassigned at gcc dot gnu |jakub at gcc dot gnu dot org |dot org | Status|NEW |ASSIGNED Last reconfirmed|2008-08-28 09:16:34 |2008-08-29 11:55:56 date| | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37261 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c/37261] [4.3/4.4 Regression] Spurious (?) "integer overflow in expression" warnings 2008-08-27 23:46 [Bug c/37261] New: Spurious (?) "integer overflow in expression" warnings roland at digitalvampire dot org 2008-08-28 9:17 ` [Bug c/37261] [4.3/4.4 Regression] " rguenth at gcc dot gnu dot org 2008-08-29 11:57 ` jakub at gcc dot gnu dot org @ 2008-08-29 12:24 ` jakub at gcc dot gnu dot org 2008-08-29 19:02 ` jakub at gcc dot gnu dot org ` (2 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: jakub at gcc dot gnu dot org @ 2008-08-29 12:24 UTC (permalink / raw) To: gcc-bugs ------- Comment #3 from jakub at gcc dot gnu dot org 2008-08-29 12:23 ------- Caused by PR33691 fix btw. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37261 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c/37261] [4.3/4.4 Regression] Spurious (?) "integer overflow in expression" warnings 2008-08-27 23:46 [Bug c/37261] New: Spurious (?) "integer overflow in expression" warnings roland at digitalvampire dot org ` (2 preceding siblings ...) 2008-08-29 12:24 ` jakub at gcc dot gnu dot org @ 2008-08-29 19:02 ` jakub at gcc dot gnu dot org 2008-08-29 19:11 ` jakub at gcc dot gnu dot org 2008-08-29 19:13 ` jakub at gcc dot gnu dot org 5 siblings, 0 replies; 7+ messages in thread From: jakub at gcc dot gnu dot org @ 2008-08-29 19:02 UTC (permalink / raw) To: gcc-bugs ------- Comment #4 from jakub at gcc dot gnu dot org 2008-08-29 19:00 ------- Subject: Bug 37261 Author: jakub Date: Fri Aug 29 18:59:13 2008 New Revision: 139784 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=139784 Log: PR c/37261 * fold-const.c (fold_binary): In (X | C1) & C2 canonicalization compute new & and | in type rather than TREE_TYPE (arg0). * gcc.dg/pr37261.c: New test. Added: trunk/gcc/testsuite/gcc.dg/pr37261.c Modified: trunk/gcc/ChangeLog trunk/gcc/fold-const.c trunk/gcc/testsuite/ChangeLog -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37261 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c/37261] [4.3/4.4 Regression] Spurious (?) "integer overflow in expression" warnings 2008-08-27 23:46 [Bug c/37261] New: Spurious (?) "integer overflow in expression" warnings roland at digitalvampire dot org ` (3 preceding siblings ...) 2008-08-29 19:02 ` jakub at gcc dot gnu dot org @ 2008-08-29 19:11 ` jakub at gcc dot gnu dot org 2008-08-29 19:13 ` jakub at gcc dot gnu dot org 5 siblings, 0 replies; 7+ messages in thread From: jakub at gcc dot gnu dot org @ 2008-08-29 19:11 UTC (permalink / raw) To: gcc-bugs ------- Comment #5 from jakub at gcc dot gnu dot org 2008-08-29 19:09 ------- Subject: Bug 37261 Author: jakub Date: Fri Aug 29 19:08:18 2008 New Revision: 139786 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=139786 Log: PR c/37261 * fold-const.c (fold_binary): In (X | C1) & C2 canonicalization compute new & and | in type rather than TREE_TYPE (arg0). * gcc.dg/pr37261.c: New test. Added: branches/gcc-4_3-branch/gcc/testsuite/gcc.dg/pr37261.c Modified: branches/gcc-4_3-branch/gcc/ChangeLog branches/gcc-4_3-branch/gcc/fold-const.c branches/gcc-4_3-branch/gcc/testsuite/ChangeLog -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37261 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c/37261] [4.3/4.4 Regression] Spurious (?) "integer overflow in expression" warnings 2008-08-27 23:46 [Bug c/37261] New: Spurious (?) "integer overflow in expression" warnings roland at digitalvampire dot org ` (4 preceding siblings ...) 2008-08-29 19:11 ` jakub at gcc dot gnu dot org @ 2008-08-29 19:13 ` jakub at gcc dot gnu dot org 5 siblings, 0 replies; 7+ messages in thread From: jakub at gcc dot gnu dot org @ 2008-08-29 19:13 UTC (permalink / raw) To: gcc-bugs ------- Comment #6 from jakub at gcc dot gnu dot org 2008-08-29 19:11 ------- Fixed. -- jakub at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |RESOLVED Resolution| |FIXED http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37261 ^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2008-08-29 19:13 UTC | newest] Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2008-08-27 23:46 [Bug c/37261] New: Spurious (?) "integer overflow in expression" warnings roland at digitalvampire dot org 2008-08-28 9:17 ` [Bug c/37261] [4.3/4.4 Regression] " rguenth at gcc dot gnu dot org 2008-08-29 11:57 ` jakub at gcc dot gnu dot org 2008-08-29 12:24 ` jakub at gcc dot gnu dot org 2008-08-29 19:02 ` jakub at gcc dot gnu dot org 2008-08-29 19:11 ` jakub at gcc dot gnu dot org 2008-08-29 19:13 ` jakub at gcc dot gnu dot org
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