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From: "theodort at inf dot ethz.ch" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/112542] New: [14 Regression] Dead Code Elimination Regression since r14-4280-gc3c6f30496d Date: Wed, 15 Nov 2023 09:42:59 +0000 [thread overview] Message-ID: <bug-112542-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112542 Bug ID: 112542 Summary: [14 Regression] Dead Code Elimination Regression since r14-4280-gc3c6f30496d Product: gcc Version: 14.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: theodort at inf dot ethz.ch Target Milestone: --- https://godbolt.org/z/3vj8x1bPK Given the following code: void foo(void); static short b = -1; static int c, e; static int *f = &c; static char g; static char(a)(char h, int i) { if (!(((i) >= -1) && ((i) <= 0))) { __builtin_unreachable(); } return h || i ? h : h < 0; } static void(d)(unsigned h) { if (!(((h) >= 0) && ((h) <= 4095017279))) { foo(); } } int main() { *f = b == 0; g = a(c, c); d(g); d(4095017279); if (e) b = 0; a(0, b); } gcc-trunk -O3 does not eliminate the call to foo: main: xorl %eax, %eax cmpw $0, b(%rip) sete %al movl %eax, c(%rip) jne .L4 pushq %rax call foo xorl %eax, %eax popq %rdx ret .L4: xorl %eax, %eax ret gcc-13.2.0 -O3 eliminates the call to foo: main: xorl %eax, %eax cmpw $0, b(%rip) sete %al movl %eax, c(%rip) xorl %eax, %eax ret Bisects to r14-4280-gc3c6f30496d
next reply other threads:[~2023-11-15 9:43 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-11-15 9:42 theodort at inf dot ethz.ch [this message] 2023-11-15 11:59 ` [Bug tree-optimization/112542] " rguenth at gcc dot gnu.org 2023-11-15 16:48 ` pinskia at gcc dot gnu.org 2024-03-07 21:02 ` law at gcc dot gnu.org 2024-05-07 7:42 ` [Bug tree-optimization/112542] [14/15 " rguenth at gcc dot gnu.org
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