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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/102586] [12 Regression] ICE in clear_padding_type, at gimple-fold.c:4798 since r12-3433-ga25e0b5e6ac8a77a Date: Thu, 10 Feb 2022 15:29:53 +0000 [thread overview] Message-ID: <bug-102586-4-wUcrY3QmEX@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-102586-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102586 --- Comment #10 from Jakub Jelinek <jakub at gcc dot gnu.org> --- So, on struct C0 {}; struct C1 {}; struct C2 : C1, virtual C0 {}; struct C3 : virtual C2, C1 { virtual int foo () { return 1; } }; struct C6 { char c; }; struct C7 : virtual C6, virtual C3, C1 { virtual int foo () { return 4; } }; struct C8 : C7 { virtual int foo () { return 5; } }; __attribute__((noipa)) void foo (C8 *q) { __builtin_clear_padding (q); } C8 c8; C7 c7; void bar () { c8.c = 42; c7.c = 43; } distilled from the testcase in the patch, c8.c is at 9 bytes into c8, while c7.c is at 8 bytes into c7, so that is likely the reason why the code considers both byte at offset 8 and 9 as non-padding - the first FIELD_DECL in C8 is one with C7 type (32 byte long like C8) but the field size is 9 bytes, so that the __builtin_clear_padding code thinks the first 9 bytes are non-padding, virtual table pointer inside of C2, then empty type C1 at off 8, then C6 at off 8 with the c 1-byte field, then C3 at offset 16 with 9 byte size but all this is already outside of the size of FIELD_DECL with C7 type. But C8 has a FIELD_DECL with C6 type at off 9...
next prev parent reply other threads:[~2022-02-10 15:29 UTC|newest] Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-10-04 7:30 [Bug tree-optimization/102586] New: " marxin at gcc dot gnu.org 2021-10-04 7:30 ` [Bug tree-optimization/102586] " marxin at gcc dot gnu.org 2021-10-04 8:21 ` jakub at gcc dot gnu.org 2021-10-04 8:22 ` marxin at gcc dot gnu.org 2021-10-04 11:43 ` jakub at gcc dot gnu.org 2021-10-04 12:04 ` jakub at gcc dot gnu.org 2021-11-15 13:03 ` jakub at gcc dot gnu.org 2021-11-15 13:05 ` jakub at gcc dot gnu.org 2022-01-17 13:14 ` rguenth at gcc dot gnu.org 2022-02-09 17:21 ` jason at gcc dot gnu.org 2022-02-10 14:08 ` jakub at gcc dot gnu.org 2022-02-10 14:18 ` jakub at gcc dot gnu.org 2022-02-10 15:29 ` jakub at gcc dot gnu.org [this message] 2022-02-10 15:35 ` jakub at gcc dot gnu.org 2022-02-10 15:56 ` jason at gcc dot gnu.org 2022-02-10 18:30 ` jakub at gcc dot gnu.org 2022-02-10 18:45 ` jason at gcc dot gnu.org 2022-02-10 19:27 ` jakub at gcc dot gnu.org 2022-02-10 22:07 ` jason at gcc dot gnu.org 2022-02-10 22:27 ` jakub at gcc dot gnu.org 2022-02-10 22:29 ` jakub at gcc dot gnu.org 2022-02-10 22:34 ` jakub at gcc dot gnu.org 2022-02-11 1:47 ` rodgertq at gcc dot gnu.org 2022-02-11 12:31 ` jakub at gcc dot gnu.org 2022-02-11 15:29 ` jason at gcc dot gnu.org 2022-02-11 16:23 ` qing.zhao at oracle dot com 2022-02-11 16:39 ` jakub at gcc dot gnu.org 2022-02-11 17:36 ` qinzhao at gcc dot gnu.org 2022-02-11 17:47 ` jakub at gcc dot gnu.org 2022-02-11 21:52 ` qing.zhao at oracle dot com 2022-03-12 4:40 ` jason at gcc dot gnu.org 2022-03-14 9:49 ` cvs-commit at gcc dot gnu.org 2022-04-07 7:15 ` cvs-commit at gcc dot gnu.org 2022-04-07 7:19 ` jakub at gcc dot gnu.org
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