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From: "jhaberman at gmail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug rtl-optimization/44194] struct returned by value generates useless stores Date: Thu, 24 Feb 2011 05:10:00 -0000 [thread overview] Message-ID: <bug-44194-4-NVFGOw361f@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-44194-4@http.gcc.gnu.org/bugzilla/> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44194 --- Comment #8 from Josh Haberman <jhaberman at gmail dot com> 2011-02-24 03:27:04 UTC --- I found another test case for this. I thought I'd post it since it's extremely different than the original one. -- class Foo { public: virtual ~Foo() {} virtual void DoSomething() = 0; }; void foo(Foo *f, void (Foo::*member)()) { (f->*member)(); } -- $ g++ -c -O3 -fomit-frame-pointer test.cc $ objdump -M intel -d test.o test.o: file format elf64-x86-64 Disassembly of section .text: 0000000000000000 <_Z3fooP3FooMS_FvvE>: 0: 40 f6 c6 01 test sil,0x1 4: 48 89 74 24 e8 mov QWORD PTR [rsp-0x18],rsi 9: 48 89 54 24 f0 mov QWORD PTR [rsp-0x10],rdx e: 74 10 je 20 <_Z3fooP3FooMS_FvvE+0x20> 10: 48 01 d7 add rdi,rdx 13: 48 8b 07 mov rax,QWORD PTR [rdi] 16: 48 8b 74 30 ff mov rsi,QWORD PTR [rax+rsi*1-0x1] 1b: ff e6 jmp rsi 1d: 0f 1f 00 nop DWORD PTR [rax] 20: 48 01 d7 add rdi,rdx 23: ff e6 jmp rsi -- We spilled rsi and rdx to the stack (in the red zone, it appears) for no reason (AFAICS).
next parent reply other threads:[~2011-02-24 3:27 UTC|newest] Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top [not found] <bug-44194-4@http.gcc.gnu.org/bugzilla/> 2011-02-24 5:10 ` jhaberman at gmail dot com [this message] 2011-04-12 22:39 ` eraman at google dot com 2011-04-14 18:59 ` eraman at google dot com 2011-04-14 22:22 ` ebotcazou at gcc dot gnu.org 2011-04-15 9:10 ` rguenth at gcc dot gnu.org 2011-04-15 19:19 ` eraman at google dot com 2011-04-15 19:34 ` rguenther at suse dot de 2011-04-15 22:27 ` eraman at google dot com 2011-04-17 10:47 ` rguenther at suse dot de 2011-04-21 0:22 ` eraman at google dot com 2011-04-21 8:37 ` rguenther at suse dot de 2011-06-14 22:59 ` eraman at gcc dot gnu.org 2011-06-15 16:50 ` ebotcazou at gcc dot gnu.org 2011-06-15 20:35 ` eraman at google dot com 2011-06-15 21:11 ` ebotcazou at gcc dot gnu.org 2011-06-15 23:17 ` xinliangli at gmail dot com 2011-06-16 5:27 ` ebotcazou at gcc dot gnu.org 2011-06-16 7:43 ` xinliangli at gmail dot com 2011-06-16 8:37 ` rguenther at suse dot de 2011-06-16 17:16 ` eraman at google dot com 2011-06-17 8:22 ` rguenther at suse dot de 2011-06-18 9:06 ` xinliangli at gmail dot com 2011-06-18 9:29 ` ebotcazou at gcc dot gnu.org 2011-06-18 16:34 ` xinliangli at gmail dot com 2011-06-20 9:22 ` rguenther at suse dot de 2011-06-20 15:28 ` ebotcazou at gcc dot gnu.org 2011-06-20 16:27 ` xinliangli at gmail dot com 2011-06-20 16:52 ` eraman at google dot com 2011-06-22 7:58 ` ebotcazou at gcc dot gnu.org 2011-07-07 14:58 ` ebotcazou at gcc dot gnu.org 2011-12-05 17:49 ` ebotcazou at gcc dot gnu.org 2012-03-22 9:10 ` rguenth at gcc dot gnu.org 2012-03-22 17:13 ` ubizjak at gmail dot com 2012-03-22 18:35 ` ebotcazou at gcc dot gnu.org 2012-07-02 14:04 ` rguenth at gcc dot gnu.org 2012-08-06 1:23 ` chip at pobox dot com 2012-09-12 22:31 ` ebotcazou at gcc dot gnu.org 2012-09-12 23:22 ` chip at pobox dot com 2012-09-13 0:00 ` ebotcazou at gcc dot gnu.org 2012-09-14 13:30 ` ebotcazou at gcc dot gnu.org 2012-09-14 13:38 ` ebotcazou at gcc dot gnu.org 2012-09-14 17:24 ` chip at pobox dot com 2012-10-21 12:36 ` ebotcazou at gcc dot gnu.org 2012-11-02 0:29 ` eraman at gcc dot gnu.org 2010-05-19 5:06 [Bug rtl-optimization/44194] New: " jhaberman at gmail dot com 2010-05-19 9:39 ` [Bug rtl-optimization/44194] " rguenth at gcc dot gnu dot org 2010-05-19 10:14 ` jakub at gcc dot gnu dot org 2010-05-19 10:22 ` rguenth at gcc dot gnu dot org 2010-07-10 1:38 ` jhaberman at gmail dot com 2010-07-10 1:40 ` pinskia at gcc dot gnu dot org 2010-07-10 1:42 ` pinskia at gcc dot gnu dot org 2010-07-10 1:48 ` jhaberman at gmail dot com
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