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* [Bug c/46454] New: Pointer to pointer function parameter handled incorrectly @ 2010-11-12 19:15 taradov at gmail dot com 2010-11-12 19:36 ` [Bug middle-end/46454] " pinskia at gcc dot gnu.org ` (2 more replies) 0 siblings, 3 replies; 4+ messages in thread From: taradov at gmail dot com @ 2010-11-12 19:15 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46454 Summary: Pointer to pointer function parameter handled incorrectly Product: gcc Version: 4.4.5 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c AssignedTo: unassigned@gcc.gnu.org ReportedBy: taradov@gmail.com Exact GCC version: gcc version 4.4.5 (Ubuntu/Linaro 4.4.4-14ubuntu5) Program below when compiled with -O2 or higher produces output like: ------- 0x08724018 0x00000000 0x08724008 With -O1 it produces expected output: ------- 0x09917018 0x09917008 0x09917008 ------------------------------------------------ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> typedef struct List_t { struct List_t *next; } List_t; typedef struct Symbol_t { struct Symbol_t *next; } Symbol_t; typedef struct First_t { Symbol_t *set; } First_t; static void list_add(void **list, void *element) { ((List_t *)element)->next = NULL; if (*list) { List_t *last = *list; while (last->next) last = last->next; last->next = element; } else *list = element; } int main(void) { First_t *item; Symbol_t *res; res = malloc(sizeof(Symbol_t)); res->next = NULL; item = malloc(sizeof(struct First_t)); item->set = NULL; list_add((void *)&item->set, res); printf("------- 0x%08lx 0x%08lx 0x%08x\n", item, item->set, res); return 0; } -------------------------------------- Bug seems to be fixed in 4.6.x branch, but present in 4.4.x and 4.5.x. ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug middle-end/46454] Pointer to pointer function parameter handled incorrectly 2010-11-12 19:15 [Bug c/46454] New: Pointer to pointer function parameter handled incorrectly taradov at gmail dot com @ 2010-11-12 19:36 ` pinskia at gcc dot gnu.org 2010-11-12 20:04 ` [Bug c/46454] " taradov at gmail dot com 2010-11-12 23:31 ` [Bug middle-end/46454] " rguenth at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: pinskia at gcc dot gnu.org @ 2010-11-12 19:36 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46454 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Component|c |middle-end --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2010-11-12 19:14:39 UTC --- I think this has aliasing violations in it. ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c/46454] Pointer to pointer function parameter handled incorrectly 2010-11-12 19:15 [Bug c/46454] New: Pointer to pointer function parameter handled incorrectly taradov at gmail dot com 2010-11-12 19:36 ` [Bug middle-end/46454] " pinskia at gcc dot gnu.org @ 2010-11-12 20:04 ` taradov at gmail dot com 2010-11-12 23:31 ` [Bug middle-end/46454] " rguenth at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: taradov at gmail dot com @ 2010-11-12 20:04 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46454 Alexander Taradov <taradov at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Component|middle-end |c --- Comment #2 from Alexander Taradov <taradov at gmail dot com> 2010-11-12 19:50:40 UTC --- (In reply to comment #1) > I think this has aliasing violations in it. Yes, my bad. ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug middle-end/46454] Pointer to pointer function parameter handled incorrectly 2010-11-12 19:15 [Bug c/46454] New: Pointer to pointer function parameter handled incorrectly taradov at gmail dot com 2010-11-12 19:36 ` [Bug middle-end/46454] " pinskia at gcc dot gnu.org 2010-11-12 20:04 ` [Bug c/46454] " taradov at gmail dot com @ 2010-11-12 23:31 ` rguenth at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: rguenth at gcc dot gnu.org @ 2010-11-12 23:31 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46454 Richard Guenther <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution| |INVALID --- Comment #3 from Richard Guenther <rguenth at gcc dot gnu.org> 2010-11-12 23:28:54 UTC --- see comment #2 ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2010-11-12 23:29 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2010-11-12 19:15 [Bug c/46454] New: Pointer to pointer function parameter handled incorrectly taradov at gmail dot com 2010-11-12 19:36 ` [Bug middle-end/46454] " pinskia at gcc dot gnu.org 2010-11-12 20:04 ` [Bug c/46454] " taradov at gmail dot com 2010-11-12 23:31 ` [Bug middle-end/46454] " rguenth at gcc dot gnu.org
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