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From: "zsojka at seznam dot cz" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug rtl-optimization/42941] New: -fsched-pressure -fschedule-insns - valgrind warns about using uninitialized variable Date: Tue, 02 Feb 2010 21:30:00 -0000 [thread overview] Message-ID: <bug-42941-14164@http.gcc.gnu.org/bugzilla/> (raw) Command line: gcc -fsched-pressure -fschedule-insns -c testcase.c Tested revisions: r156367 - fail ------- testcase.c -------- int foo(void) { return 0; } --------------------------- Output: $ valgrind --track-origins=yes /mnt/svn/gcc-trunk/binary-156367-lto/libexec/gcc/x86_64-unknown-linux-gnu/4.5.0/cc1plus -fsched-pressure -fschedule-insns testcase.c ==15355== Memcheck, a memory error detector ==15355== Copyright (C) 2002-2009, and GNU GPL'd, by Julian Seward et al. ==15355== Using Valgrind-3.5.0 and LibVEX; rerun with -h for copyright info ==15355== Command: /mnt/svn/gcc-trunk/binary-156367-lto/libexec/gcc/x86_64-unknown-linux-gnu/4.5.0/cc1plus -fsched-pressure -fschedule-insns testcase.c ==15355== int foo() Analyzing compilation unit Performing interprocedural optimizations <visibility> <*free_lang_data> <early_local_cleanups> <whole-program> <inline>Assembling functions: int foo()==15355== Conditional jump or move depends on uninitialised value(s) ==15355== at 0xD35F88: setup_insn_max_reg_pressure (haifa-sched.c:1597) ==15355== by 0x8A9C5F: schedule_insns (sched-rgn.c:2965) ==15355== by 0x8A9DFD: rest_of_handle_sched (sched-rgn.c:3512) ==15355== by 0x84FEEA: execute_one_pass (passes.c:1561) ==15355== by 0x850174: execute_pass_list (passes.c:1616) ==15355== by 0x850186: execute_pass_list (passes.c:1617) ==15355== by 0x945C34: tree_rest_of_compilation (tree-optimize.c:413) ==15355== by 0xAC70A0: cgraph_expand_function (cgraphunit.c:1543) ==15355== by 0xAC7E1F: cgraph_output_in_order (cgraphunit.c:1719) ==15355== by 0xAC9E4E: cgraph_optimize (cgraphunit.c:1867) ==15355== by 0xACA024: cgraph_finalize_compilation_unit (cgraphunit.c:1093) ==15355== by 0x54E4DA: cp_write_global_declarations (decl2.c:3798) ==15355== Uninitialised value was created by a heap allocation ==15355== at 0x4C280AC: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so) ==15355== by 0xDE78D7: xmalloc (xmalloc.c:147) ==15355== by 0xD7CD78: sched_analyze_insn (sched-deps.c:2036) ==15355== by 0xD7D294: deps_analyze_insn (sched-deps.c:3248) ==15355== by 0xD7DA43: sched_analyze (sched-deps.c:3398) ==15355== by 0x8A819D: sched_rgn_compute_dependencies (sched-rgn.c:2726) ==15355== by 0x8A9827: schedule_insns (sched-rgn.c:2938) ==15355== by 0x8A9DFD: rest_of_handle_sched (sched-rgn.c:3512) ==15355== by 0x84FEEA: execute_one_pass (passes.c:1561) ==15355== by 0x850174: execute_pass_list (passes.c:1616) ==15355== by 0x850186: execute_pass_list (passes.c:1617) ==15355== by 0x945C34: tree_rest_of_compilation (tree-optimize.c:413) ==15355== ==15355== Conditional jump or move depends on uninitialised value(s) ==15355== at 0xD35F88: setup_insn_max_reg_pressure (haifa-sched.c:1597) ==15355== by 0xD3BE48: schedule_insn (haifa-sched.c:1632) ==15355== by 0xD3E9D0: schedule_block (haifa-sched.c:3143) ==15355== by 0x8A9B09: schedule_insns (sched-rgn.c:3001) ==15355== by 0x8A9DFD: rest_of_handle_sched (sched-rgn.c:3512) ==15355== by 0x84FEEA: execute_one_pass (passes.c:1561) ==15355== by 0x850174: execute_pass_list (passes.c:1616) ==15355== by 0x850186: execute_pass_list (passes.c:1617) ==15355== by 0x945C34: tree_rest_of_compilation (tree-optimize.c:413) ==15355== by 0xAC70A0: cgraph_expand_function (cgraphunit.c:1543) ==15355== by 0xAC7E1F: cgraph_output_in_order (cgraphunit.c:1719) ==15355== by 0xAC9E4E: cgraph_optimize (cgraphunit.c:1867) ==15355== Uninitialised value was created by a heap allocation ==15355== at 0x4C280AC: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so) ==15355== by 0xDE78D7: xmalloc (xmalloc.c:147) ==15355== by 0xD7CD78: sched_analyze_insn (sched-deps.c:2036) ==15355== by 0xD7D294: deps_analyze_insn (sched-deps.c:3248) ==15355== by 0xD7DA43: sched_analyze (sched-deps.c:3398) ==15355== by 0x8A819D: sched_rgn_compute_dependencies (sched-rgn.c:2726) ==15355== by 0x8A9827: schedule_insns (sched-rgn.c:2938) ==15355== by 0x8A9DFD: rest_of_handle_sched (sched-rgn.c:3512) ==15355== by 0x84FEEA: execute_one_pass (passes.c:1561) ==15355== by 0x850174: execute_pass_list (passes.c:1616) ==15355== by 0x850186: execute_pass_list (passes.c:1617) ==15355== by 0x945C34: tree_rest_of_compilation (tree-optimize.c:413) ==15355== With more complicated code more warnings are issued. I wasn't able to cause difference in code generated with different --malloc-fill. -- Summary: -fsched-pressure -fschedule-insns - valgrind warns about using uninitialized variable Product: gcc Version: 4.5.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: rtl-optimization AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: zsojka at seznam dot cz GCC host triplet: x86(_64)-pc-linux-gnu GCC target triplet: x86(_64)-pc-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42941
next reply other threads:[~2010-02-02 21:30 UTC|newest] Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top 2010-02-02 21:30 zsojka at seznam dot cz [this message] 2010-02-02 21:32 ` [Bug rtl-optimization/42941] " zsojka at seznam dot cz 2010-02-03 10:40 ` rguenth at gcc dot gnu dot org 2010-02-03 18:57 ` vmakarov at redhat dot com 2010-02-03 19:02 ` vmakarov at gcc dot gnu dot org 2010-02-07 20:57 ` pinskia at gcc dot gnu dot org 2010-03-13 2:52 ` pinskia at gcc dot gnu dot org
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