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* [Bug middle-end/21862] New: strength reduction uses signed comparisons for pointers
@ 2005-06-01 13:10 jakub at gcc dot gnu dot org
2005-06-01 13:11 ` [Bug middle-end/21862] " jakub at gcc dot gnu dot org
2005-06-01 13:18 ` pinskia at gcc dot gnu dot org
0 siblings, 2 replies; 3+ messages in thread
From: jakub at gcc dot gnu dot org @ 2005-06-01 13:10 UTC (permalink / raw)
To: gcc-bugs
The attached testcase fails on i386-linux (as well as x86_64-linux -m32).
It computes the p + (MAP_LEN / 0x100) * 0x100 end pointer, but instead of
doing unsigned comparison on the pointers, it does a signed one,
which obviously doesn't work if the pointer has topmost bit set.
--
Summary: strength reduction uses signed comparisons for pointers
Product: gcc
Version: 3.4.4
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: middle-end
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: jakub at gcc dot gnu dot org
CC: gcc-bugs at gcc dot gnu dot org
GCC target triplet: i386-linux
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21862
^ permalink raw reply [flat|nested] 3+ messages in thread* [Bug middle-end/21862] strength reduction uses signed comparisons for pointers 2005-06-01 13:10 [Bug middle-end/21862] New: strength reduction uses signed comparisons for pointers jakub at gcc dot gnu dot org @ 2005-06-01 13:11 ` jakub at gcc dot gnu dot org 2005-06-01 13:18 ` pinskia at gcc dot gnu dot org 1 sibling, 0 replies; 3+ messages in thread From: jakub at gcc dot gnu dot org @ 2005-06-01 13:11 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From jakub at gcc dot gnu dot org 2005-06-01 13:10 ------- Created an attachment (id=9007) --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=9007&action=view) testcase -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21862 ^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug middle-end/21862] strength reduction uses signed comparisons for pointers 2005-06-01 13:10 [Bug middle-end/21862] New: strength reduction uses signed comparisons for pointers jakub at gcc dot gnu dot org 2005-06-01 13:11 ` [Bug middle-end/21862] " jakub at gcc dot gnu dot org @ 2005-06-01 13:18 ` pinskia at gcc dot gnu dot org 1 sibling, 0 replies; 3+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-06-01 13:18 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2005-06-01 13:18 ------- This is a known bug, see gcc.c-torture/execute/loop-2e.c. This is a dup of bug 16052. *** This bug has been marked as a duplicate of 16052 *** -- What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution| |DUPLICATE http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21862 ^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2005-06-01 13:18 UTC | newest] Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2005-06-01 13:10 [Bug middle-end/21862] New: strength reduction uses signed comparisons for pointers jakub at gcc dot gnu dot org 2005-06-01 13:11 ` [Bug middle-end/21862] " jakub at gcc dot gnu dot org 2005-06-01 13:18 ` pinskia at gcc dot gnu dot org
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