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From: "kkojima at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug target/67573] New: [SH] wrong code generated for libstdc++-v3/src/c++11/cxx11-shim_facets.cc at -mlra Date: Mon, 14 Sep 2015 13:00:00 -0000 [thread overview] Message-ID: <bug-67573-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67573 Bug ID: 67573 Summary: [SH] wrong code generated for libstdc++-v3/src/c++11/cxx11-shim_facets.cc at -mlra Product: gcc Version: 6.0 Status: UNCONFIRMED Keywords: wrong-code Severity: normal Priority: P3 Component: target Assignee: unassigned at gcc dot gnu.org Reporter: kkojima at gcc dot gnu.org CC: olegendo at gcc dot gnu.org Blocks: 55212 Target Milestone: --- Target: sh*-*-* Wrong code is generated with sh-linux/sh-elf compilers for void std::__facet_shims::__moneypunct_fill_cache<wchar_t, true>(std::integral_constant<bool, true>, std::locale::facet const*, std::__moneypunct_cache<wchar_t, true>*) at "-m4 -ml -O2 -fPIC -mlra -std=gnu++11". It uses __copy<wchar_t> inline function and __copy<wchar_t> calls std::__cxx11::basic_string<wchar_t, std::char_traits<wchar_t>, std::allocator<wchar_t> >::copy(wchar_t*, unsigned int, unsigned int) with the wrong code mov r11,r4 mov.l .L1122,r7 mov r0,r5 mov.l @r15,r6 mov r10,r4 bsrf r7 .LPCS203: mov.l r0,@(4,r15) ... .L1122: .long _ZNKSt7__cxx1112basic_stringIwSt11char_traitsIwESaIwEE4copyEPwjj@PLT-(.LPCS203+2-.) where r7 should be 0 as the last argument. With -mno-lra, the corresponding code is: mov.l .L1050,r1 mov r0,r14 mov #0,r7 mov r13,r6 mov r0,r5 bsrf r1 .LPCS191: mov r10,r4 ... It seems that dse/dce removes mov #0, r7. .pro_and_epilogue: (insn 204 831 830 22 (set (reg:SI 7 r7) (const_int 0 [0])) fa.cc:484 253 {movsi_ie} (nil)) .dse2 marks r7 unused: (insn 204 831 830 22 (set (reg:SI 7 r7) (const_int 0 [0])) fa.cc:484 253 {movsi_ie} (expr_list:REG_UNUSED (reg:SI 7 r7) (nil))) .jump2 eliminates insn 204: DCE: Deleting insn 204 deleting insn with uid = 204. Referenced Bugs: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55212 [Bug 55212] [SH] Switch to LRA
next reply other threads:[~2015-09-14 13:00 UTC|newest] Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-09-14 13:00 kkojima at gcc dot gnu.org [this message] 2015-09-14 13:09 ` [Bug target/67573] " kkojima at gcc dot gnu.org 2015-09-15 11:28 ` kkojima at gcc dot gnu.org 2015-09-15 14:13 ` kkojima at gcc dot gnu.org 2015-09-15 23:14 ` olegendo at gcc dot gnu.org 2015-09-17 0:13 ` kkojima at gcc dot gnu.org 2015-09-17 0:24 ` kkojima at gcc dot gnu.org 2015-09-17 14:28 ` olegendo at gcc dot gnu.org 2015-09-19 12:52 ` kkojima at gcc dot gnu.org 2015-09-20 23:54 ` kkojima at gcc dot gnu.org
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