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From: "scherrer.sv at gmail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/110992] New: [14 Regression] Dead Code Elimination Regression at -O3 since r14-1654-g7ceed7e3e29 Date: Fri, 11 Aug 2023 13:24:08 +0000 [thread overview] Message-ID: <bug-110992-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110992 Bug ID: 110992 Summary: [14 Regression] Dead Code Elimination Regression at -O3 since r14-1654-g7ceed7e3e29 Product: gcc Version: 14.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: scherrer.sv at gmail dot com Target Milestone: --- static unsigned b; static short c = 4; void foo(void); static short(a)(short d, short g) { return d * g; } void e(); static char f() { b = 0; return 0; } int main() { int h = b; if ((short)(a(c && e, 65535) & h)) { foo(); h || f(); } } gcc-bcda361daae (trunk) -O3 cannot eliminate the call to foo but gcc-releases/gcc-13.1.0 -O3 can. ----------------------------------------------------------------------- gcc-bcda361daaec8623c91d0dff3ea8e576373b5f50 -O3 case.c -S -o case.s --------- OUTPUT --------- main: .LFB2: .cfi_startproc cmpw $0, b(%rip) jne .L8 xorl %eax, %eax ret .L8: pushq %rax .cfi_def_cfa_offset 16 call foo xorl %eax, %eax popq %rdx .cfi_def_cfa_offset 8 ret ---------- END OUTPUT --------- ----------------------------------------------------------------------- gcc-2b98cc24d6af0432a74f6dad1c722ce21c1f7458 -O3 case.c -S -o case.s --------- OUTPUT --------- main: .LFB2: .cfi_startproc xorl %eax, %eax ret ---------- END OUTPUT --------- ----------------------------------------------------------------------- Bisects to r14-1654-g7ceed7e3e29
next reply other threads:[~2023-08-11 13:24 UTC|newest] Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-08-11 13:24 scherrer.sv at gmail dot com [this message] 2023-08-11 17:38 ` [Bug tree-optimization/110992] " pinskia at gcc dot gnu.org 2023-08-26 0:30 ` pinskia at gcc dot gnu.org 2023-09-14 21:11 ` pinskia at gcc dot gnu.org 2023-09-14 21:22 ` pinskia at gcc dot gnu.org 2023-09-15 3:19 ` [Bug tree-optimization/110992] [13/14 Regression] missed VRP optimization due to transformation of `a & -zero_one_valued_p` into `a * zero_one_valued_p` pinskia at gcc dot gnu.org 2023-09-15 3:54 ` pinskia at gcc dot gnu.org 2023-09-15 4:13 ` pinskia at gcc dot gnu.org 2023-09-15 4:33 ` pinskia at gcc dot gnu.org 2023-09-15 16:28 ` pinskia at gcc dot gnu.org 2023-09-15 22:45 ` pinskia at gcc dot gnu.org 2023-09-16 16:33 ` pinskia at gcc dot gnu.org 2023-09-18 23:51 ` pinskia at gcc dot gnu.org 2024-03-07 23:24 ` law at gcc dot gnu.org 2024-03-09 6:40 ` law at gcc dot gnu.org 2024-03-09 8:55 ` xry111 at gcc dot gnu.org 2024-05-21 9:16 ` [Bug tree-optimization/110992] [13/14/15 " jakub at gcc dot gnu.org
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