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* [Bug middle-end/111573] New: lambda functions often not inlined and optimized out @ 2023-09-24 13:34 hubicka at gcc dot gnu.org 2023-10-24 4:22 ` [Bug ipa/111573] " pinskia at gcc dot gnu.org ` (2 more replies) 0 siblings, 3 replies; 4+ messages in thread From: hubicka at gcc dot gnu.org @ 2023-09-24 13:34 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111573 Bug ID: 111573 Summary: lambda functions often not inlined and optimized out Product: gcc Version: 14.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: middle-end Assignee: unassigned at gcc dot gnu.org Reporter: hubicka at gcc dot gnu.org Target Milestone: --- #include <functional> using namespace std; static int dosum(std::function<int(int,int)> fn) { return fn(5,6); } int test() { auto sum = [](int a, int b) { return a + b; }; int s; for (s = 0; s < 10; s++) s+= dosum(sum); return s; } Gets optimized well only with early inlining. compiled with -fno-early-inlining yields to: _Z4testv: .LFB2166: .cfi_startproc subq $56, %rsp .cfi_def_cfa_offset 64 xorl %ecx, %ecx .p2align 4,,10 .p2align 3 .L8: leaq 12(%rsp), %rdx leaq 8(%rsp), %rsi movl $5, 8(%rsp) leaq 16(%rsp), %rdi movl $6, 12(%rsp) call _ZNSt17_Function_handlerIFiiiEZ4testvEUliiE_E9_M_invokeERKSt9_Any_dataOiS6_ leal 1(%rcx,%rax), %ecx cmpl $9, %ecx jle .L8 movl %ecx, %eax addq $56, %rsp .cfi_def_cfa_offset 8 ret So we fail to inline since ipa-prop fails to track the constant function address. I think this is really common in typical lambda function usage ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug ipa/111573] lambda functions often not inlined and optimized out 2023-09-24 13:34 [Bug middle-end/111573] New: lambda functions often not inlined and optimized out hubicka at gcc dot gnu.org @ 2023-10-24 4:22 ` pinskia at gcc dot gnu.org 2024-02-20 14:48 ` jamborm at gcc dot gnu.org 2024-03-25 10:35 ` xry111 at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: pinskia at gcc dot gnu.org @ 2023-10-24 4:22 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111573 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Last reconfirmed| |2023-10-24 Ever confirmed|0 |1 Status|UNCONFIRMED |NEW Severity|normal |enhancement --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Confirmed. ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug ipa/111573] lambda functions often not inlined and optimized out 2023-09-24 13:34 [Bug middle-end/111573] New: lambda functions often not inlined and optimized out hubicka at gcc dot gnu.org 2023-10-24 4:22 ` [Bug ipa/111573] " pinskia at gcc dot gnu.org @ 2024-02-20 14:48 ` jamborm at gcc dot gnu.org 2024-03-25 10:35 ` xry111 at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: jamborm at gcc dot gnu.org @ 2024-02-20 14:48 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111573 --- Comment #2 from Martin Jambor <jamborm at gcc dot gnu.org> --- I cannot see any difference at -O3 with or without -fno-early-inlining. ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug ipa/111573] lambda functions often not inlined and optimized out 2023-09-24 13:34 [Bug middle-end/111573] New: lambda functions often not inlined and optimized out hubicka at gcc dot gnu.org 2023-10-24 4:22 ` [Bug ipa/111573] " pinskia at gcc dot gnu.org 2024-02-20 14:48 ` jamborm at gcc dot gnu.org @ 2024-03-25 10:35 ` xry111 at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: xry111 at gcc dot gnu.org @ 2024-03-25 10:35 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111573 Xi Ruoyao <xry111 at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |chfast at gmail dot com --- Comment #3 from Xi Ruoyao <xry111 at gcc dot gnu.org> --- *** Bug 114452 has been marked as a duplicate of this bug. *** ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2024-03-25 10:35 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2023-09-24 13:34 [Bug middle-end/111573] New: lambda functions often not inlined and optimized out hubicka at gcc dot gnu.org 2023-10-24 4:22 ` [Bug ipa/111573] " pinskia at gcc dot gnu.org 2024-02-20 14:48 ` jamborm at gcc dot gnu.org 2024-03-25 10:35 ` xry111 at gcc dot gnu.org
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