public inbox for gcc-bugs@sourceware.org help / color / mirror / Atom feed
From: "rguenth at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug target/39678] std::transform is incorrect with std::multiples and bind2nd for complex<float> Date: Tue, 07 Apr 2009 15:45:00 -0000 [thread overview] Message-ID: <20090407154500.6974.qmail@sourceware.org> (raw) In-Reply-To: <bug-39678-15185@http.gcc.gnu.org/bugzilla/> ------- Comment #9 from rguenth at gcc dot gnu dot org 2009-04-07 15:44 ------- Wait - it's ok. class binder2nd : public unary_function<typename _Operation::first_argument_type, typename _Operation::result_type> { protected: _Operation op; typename _Operation::second_argument_type value; _Operation is probably empty, so there are 4 bytes padding and the struct is returned in a xmm0 (gdb) p $xmm0 $5 = {v4_float = {-9.04046813e+33, 4, 0, 0} but we access the result like call _ZSt7bind2ndISt10multipliesISt7complexIfEES2_ESt9binder2ndIT_ERKS5_RKT0_ movl 72(%rsp), %edx movq %xmm0, 8(%rsp) movq 8(%rsp), %rax movl %edx, 88(%rsp) movq %rax, 80(%rsp) movss 88(%rsp), %xmm5 movq %rax, 64(%rsp) movss 84(%rsp), %xmm4 movq %rax, 96(%rsp) movl %edx, 104(%rsp) .loc 5 1144 0 movaps %xmm4, %xmm0 movaps %xmm5, %xmm1 movss 4(%rbx), %xmm3 movss (%rbx), %xmm2 movss %xmm4, 32(%rsp) movss %xmm5, 16(%rsp) call __mulsc3 movq %xmm0, 56(%rsp) movl 56(%rsp), %eax movl 60(%rsp), %edx so you can see we simply use the lower 8 bytes of %xmm0 only ... (supposedly thinking that the other half got loaded to %edx). It's already broken at expansion: (call_insn 67 66 68 11 t.C:13 (set (parallel:BLK [ (expr_list:REG_DEP_TRUE (reg:DI 21 xmm0) (const_int 0 [0x0])) ]) (call (mem:QI (symbol_ref/i:DI ("_ZSt7bind2ndISt10multipliesISt7complexIfEES2_ESt9binder2ndIT_ERKS5_RKT0_") [flags 0x1] <function_decl 0x7ffff4887d00 bind2nd>) [0 S1 A8]) (const_int 0 [0x0]))) -1 (expr_list:REG_EH_REGION (const_int 0 [0x0]) (nil)) (expr_list:REG_DEP_TRUE (use (reg:DI 5 di)) (expr_list:REG_DEP_TRUE (use (reg:DI 4 si)) (nil)))) (insn 68 67 69 11 t.C:13 (set (reg:DI 92) (reg:DI 21 xmm0)) -1 (nil)) -- rguenth at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- GCC target triplet|same |x86_64-*-* http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39678
next prev parent reply other threads:[~2009-04-07 15:45 UTC|newest] Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top 2009-04-07 13:50 [Bug c++/39678] New: " diepen at astron dot nl 2009-04-07 13:54 ` [Bug c++/39678] " paolo dot carlini at oracle dot com 2009-04-07 14:03 ` diepen at astron dot nl 2009-04-07 14:18 ` paolo dot carlini at oracle dot com 2009-04-07 14:24 ` paolo dot carlini at oracle dot com 2009-04-07 14:51 ` [Bug target/39678] " rguenth at gcc dot gnu dot org 2009-04-07 15:04 ` paolo dot carlini at oracle dot com 2009-04-07 15:29 ` rguenth at gcc dot gnu dot org 2009-04-07 15:33 ` paolo dot carlini at oracle dot com 2009-04-07 15:45 ` rguenth at gcc dot gnu dot org [this message] 2009-04-07 15:45 ` rguenth at gcc dot gnu dot org 2009-04-07 15:47 ` rguenth at gcc dot gnu dot org 2009-04-07 15:48 ` paolo dot carlini at oracle dot com 2009-04-07 15:57 ` rguenth at gcc dot gnu dot org 2009-04-07 16:05 ` rguenth at gcc dot gnu dot org 2009-04-07 16:05 ` rguenth at gcc dot gnu dot org 2009-04-07 16:24 ` paolo dot carlini at oracle dot com 2009-04-07 16:45 ` paolo dot carlini at oracle dot com 2009-04-07 19:01 ` paolo dot carlini at oracle dot com 2009-04-07 20:47 ` paolo dot carlini at oracle dot com 2009-04-07 22:04 ` paolo dot carlini at oracle dot com 2009-04-08 8:40 ` rguenth at gcc dot gnu dot org 2009-04-08 9:11 ` paolo dot carlini at oracle dot com 2009-04-08 23:42 ` [Bug target/39678] C++ empty struct is passed incorrectly hjl dot tools at gmail dot com 2009-04-09 1:16 ` [Bug target/39678] complex type isn't passed correctly hjl dot tools at gmail dot com 2009-04-09 1:17 ` hjl dot tools at gmail dot com 2009-04-09 1:18 ` hjl dot tools at gmail dot com 2009-04-09 4:43 ` hjl dot tools at gmail dot com 2009-04-09 7:58 ` rguenther at suse dot de 2009-04-09 14:18 ` hjl dot tools at gmail dot com 2009-04-09 15:09 ` diepen at astron dot nl 2009-04-09 15:36 ` hjl dot tools at gmail dot com 2009-04-09 15:46 ` rguenth at gcc dot gnu dot org 2009-04-09 22:59 ` hjl at gcc dot gnu dot org 2009-04-14 20:28 ` hjl at gcc dot gnu dot org 2009-04-28 23:44 ` pinskia at gcc dot gnu dot org
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=20090407154500.6974.qmail@sourceware.org \ --to=gcc-bugzilla@gcc.gnu.org \ --cc=gcc-bugs@gcc.gnu.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).