Command line:
$ gcc -fcompare-debug testcase.c -O2 -ftracer -fsched-pressure -funroll-loops
-fschedule-insns
Output with valgrind:
$ valgrind -q --trace-children=yes
/mnt/svn/gcc-trunk/binary-162456-lto-fortran-checking-yes-rtl-df/bin/gcc -O2
-ftracer -fsched-pressure -funroll-loops -fschedule-insns -fcompare-debug
testcase.c
==25565== Conditional jump or move depends on uninitialised value(s)
==25565== at 0x70DD7B: walk_gimple_stmt (gimple.c:1629)
==25565== by 0x95A913: dump_enumerated_decls (tree-ssa-live.c:1264)
==25565== by 0x8FD118: execute_cleanup_cfg_post_optimizing
(tree-optimize.c:214)
==25565== by 0x7BB16D: execute_one_pass (passes.c:1563)
==25565== by 0x7BB404: execute_pass_list (passes.c:1618)
==25565== by 0x8FDAA5: tree_rest_of_compilation (tree-optimize.c:452)
==25565== by 0xAB4C75: cgraph_expand_function (cgraphunit.c:1643)
==25565== by 0xAB7B09: cgraph_optimize (cgraphunit.c:1722)
==25565== by 0xAB80FA: cgraph_finalize_compilation_unit (cgraphunit.c:1185)
==25565== by 0x4DF3EE: c_write_global_declarations (c-decl.c:9698)
==25565== by 0x8A91F5: toplev_main (toplev.c:990)
==25565== by 0x6589BBC: (below main) (in /lib64/libc-2.11.2.so)
==25565==
==26524== Conditional jump or move depends on uninitialised value(s)
==26524== at 0x70DD7B: walk_gimple_stmt (gimple.c:1629)
==26524== by 0x95A913: dump_enumerated_decls (tree-ssa-live.c:1264)
==26524== by 0x8FD118: execute_cleanup_cfg_post_optimizing
(tree-optimize.c:214)
==26524== by 0x7BB16D: execute_one_pass (passes.c:1563)
==26524== by 0x7BB404: execute_pass_list (passes.c:1618)
==26524== by 0x8FDAA5: tree_rest_of_compilation (tree-optimize.c:452)
==26524== by 0xAB4C75: cgraph_expand_function (cgraphunit.c:1643)
==26524== by 0xAB7B09: cgraph_optimize (cgraphunit.c:1722)
==26524== by 0xAB80FA: cgraph_finalize_compilation_unit (cgraphunit.c:1185)
==26524== by 0x4DF3EE: c_write_global_declarations (c-decl.c:9698)
==26524== by 0x8A91F5: toplev_main (toplev.c:990)
==26524== by 0x6589BBC: (below main) (in /lib64/libc-2.11.2.so)
==26524==
gcc: error: testcase.c: -fcompare-debug failure (length)
The uninitialised read is probably not related, testcase fails in older
revisions, where this valgrind warning isn't present.
Tested revisions:
r162456 - fail
r162222 - fail
r159696 - fail
r153685 - fail
--
Summary: another -fcompare-debug failure with uninitialised read
in walk_gimple_stmt
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: debug
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=45055
