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From: "socketpair at gmail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug regression/107767] New: GCC has some problems in optimizer of trivial case Date: Sun, 20 Nov 2022 13:00:30 +0000 [thread overview] Message-ID: <bug-107767-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107767 Bug ID: 107767 Summary: GCC has some problems in optimizer of trivial case Product: gcc Version: 13.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: regression Assignee: unassigned at gcc dot gnu.org Reporter: socketpair at gmail dot com Target Milestone: --- See https://godbolt.org/z/rTfTondfP ``` #include <stdint.h> int firewall(const uint8_t *restrict data) { const uint8_t ip_proto = *data; const uint16_t dst_port = *((const uint16_t *)data + 32); if (ip_proto == 17 && dst_port == 15) return 1; if (ip_proto == 17 && dst_port == 23) return 1; if (ip_proto == 17 && dst_port == 47) return 1; if (ip_proto == 17 && dst_port == 45) return 1; if (ip_proto == 17 && dst_port == 42) return 1; if (ip_proto == 17 && dst_port == 1) return 1; if (ip_proto == 17 && dst_port == 2) return 1; if (ip_proto == 17 && dst_port == 3) return 1; return 0; } int firewall2(const uint8_t *restrict data) { const uint16_t dst_port = *((const uint16_t *)data + 32); if (dst_port == 15) return 1; if (dst_port == 23) return 1; if (dst_port == 47) return 1; if (dst_port == 45) return 1; if (dst_port == 42) return 1; if (dst_port == 1) return 1; if (dst_port == 2) return 1; if (dst_port == 3) return 1; return 0; } ``` Compile with -Os. Second function IS NOT minimal, obviously. It's a bug. GCC 12.2 does not have it.
next reply other threads:[~2022-11-20 13:00 UTC|newest] Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-11-20 13:00 socketpair at gmail dot com [this message] 2022-11-20 13:02 ` [Bug regression/107767] " socketpair at gmail dot com 2022-11-21 8:46 ` marxin at gcc dot gnu.org 2022-11-21 10:33 ` socketpair at gmail dot com 2022-11-21 15:57 ` [Bug tree-optimization/107767] [13 Regression] " pinskia at gcc dot gnu.org 2022-12-02 14:27 ` [Bug tree-optimization/107767] [13 Regression] switch to table conversion happening even though using btq is better marxin at gcc dot gnu.org 2022-12-02 14:54 ` socketpair at gmail dot com 2022-12-02 15:00 ` marxin at gcc dot gnu.org 2022-12-02 15:07 ` marxin at gcc dot gnu.org 2022-12-02 15:15 ` socketpair at gmail dot com 2022-12-02 15:17 ` jakub at gcc dot gnu.org 2022-12-02 15:27 ` rguenth at gcc dot gnu.org 2022-12-02 15:31 ` jakub at gcc dot gnu.org 2022-12-02 15:44 ` jakub at gcc dot gnu.org 2022-12-05 14:49 ` marxin at gcc dot gnu.org 2022-12-21 9:46 ` rguenth at gcc dot gnu.org 2022-12-23 14:05 ` marxin at gcc dot gnu.org 2023-01-04 14:26 ` jakub at gcc dot gnu.org 2023-01-06 12:36 ` marxin at gcc dot gnu.org 2023-01-09 10:02 ` rguenth at gcc dot gnu.org 2023-01-11 12:14 ` cvs-commit at gcc dot gnu.org 2023-01-11 12:14 ` rguenth at gcc dot gnu.org
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