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* [Bug c/28196] New: miscompiled initialization of a constant pointer reference with offset (ppc64 target)
@ 2006-06-28 20:44 inbox at b-q-c dot com
2006-06-28 20:47 ` [Bug c/28196] " inbox at b-q-c dot com
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: inbox at b-q-c dot com @ 2006-06-28 20:44 UTC (permalink / raw)
To: gcc-bugs
The following code is miscompiled when using -m64 (=ppc64) target:
const static double a = 1.0;
const static double *b = (double*)&a - 1;
&b[1] should be &a, but it's not - there is an additional offset of 0x10000
--
Summary: miscompiled initialization of a constant pointer
reference with offset (ppc64 target)
Product: gcc
Version: 4.0.3
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: inbox at b-q-c dot com
GCC build triplet: powerpc-apple-darwin8.6
GCC host triplet: powerpc-apple-darwin8.6
GCC target triplet: powerpc-apple-darwin8.6 (ppc64)
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28196
^ permalink raw reply [flat|nested] 5+ messages in thread* [Bug c/28196] miscompiled initialization of a constant pointer reference with offset (ppc64 target) 2006-06-28 20:44 [Bug c/28196] New: miscompiled initialization of a constant pointer reference with offset (ppc64 target) inbox at b-q-c dot com @ 2006-06-28 20:47 ` inbox at b-q-c dot com 2006-06-28 20:50 ` inbox at b-q-c dot com ` (2 subsequent siblings) 3 siblings, 0 replies; 5+ messages in thread From: inbox at b-q-c dot com @ 2006-06-28 20:47 UTC (permalink / raw) To: gcc-bugs ------- Comment #1 from inbox at b-q-c dot com 2006-06-28 20:44 ------- Created an attachment (id=11774) --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=11774&action=view) test case - returns 0 on success or 1 when miscompiled gcc -m64 -o gcc64bug gcc64bug.c Inspection of the a and b will show: a = 1fe8 b = 100001fe0 -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28196 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c/28196] miscompiled initialization of a constant pointer reference with offset (ppc64 target) 2006-06-28 20:44 [Bug c/28196] New: miscompiled initialization of a constant pointer reference with offset (ppc64 target) inbox at b-q-c dot com 2006-06-28 20:47 ` [Bug c/28196] " inbox at b-q-c dot com @ 2006-06-28 20:50 ` inbox at b-q-c dot com 2006-06-28 20:51 ` inbox at b-q-c dot com 2006-06-28 21:15 ` pinskia at gcc dot gnu dot org 3 siblings, 0 replies; 5+ messages in thread From: inbox at b-q-c dot com @ 2006-06-28 20:50 UTC (permalink / raw) To: gcc-bugs ------- Comment #2 from inbox at b-q-c dot com 2006-06-28 20:47 ------- The original description should state that there is an additional offset of 0x100000000 (it said 0x10000 instead). Also this bug is reproducible with earlier version of gcc such as 4.0.1 as supplied by Apple. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28196 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c/28196] miscompiled initialization of a constant pointer reference with offset (ppc64 target) 2006-06-28 20:44 [Bug c/28196] New: miscompiled initialization of a constant pointer reference with offset (ppc64 target) inbox at b-q-c dot com 2006-06-28 20:47 ` [Bug c/28196] " inbox at b-q-c dot com 2006-06-28 20:50 ` inbox at b-q-c dot com @ 2006-06-28 20:51 ` inbox at b-q-c dot com 2006-06-28 21:15 ` pinskia at gcc dot gnu dot org 3 siblings, 0 replies; 5+ messages in thread From: inbox at b-q-c dot com @ 2006-06-28 20:51 UTC (permalink / raw) To: gcc-bugs ------- Comment #3 from inbox at b-q-c dot com 2006-06-28 20:50 ------- Created an attachment (id=11775) --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=11775&action=view) output of gcc -v -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28196 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c/28196] miscompiled initialization of a constant pointer reference with offset (ppc64 target) 2006-06-28 20:44 [Bug c/28196] New: miscompiled initialization of a constant pointer reference with offset (ppc64 target) inbox at b-q-c dot com ` (2 preceding siblings ...) 2006-06-28 20:51 ` inbox at b-q-c dot com @ 2006-06-28 21:15 ` pinskia at gcc dot gnu dot org 3 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu dot org @ 2006-06-28 21:15 UTC (permalink / raw) To: gcc-bugs ------- Comment #4 from pinskia at gcc dot gnu dot org 2006-06-28 21:05 ------- .quad _a-8 Not a GCC bug, a bug in the cctools assembler/linker, report this to Apple. -- pinskia at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution| |INVALID http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28196 ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2006-06-28 21:06 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2006-06-28 20:44 [Bug c/28196] New: miscompiled initialization of a constant pointer reference with offset (ppc64 target) inbox at b-q-c dot com 2006-06-28 20:47 ` [Bug c/28196] " inbox at b-q-c dot com 2006-06-28 20:50 ` inbox at b-q-c dot com 2006-06-28 20:51 ` inbox at b-q-c dot com 2006-06-28 21:15 ` pinskia at gcc dot gnu dot org
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