This can be related to pr42941
Command line:
gcc -fschedule-insns -fsched-pressure testcase.c
---- testcase.c ----
extern void exit(int);
int main(int argc, char *argv[])
{
exit(0);
}
--------------------
gcc has to be compiled with valgrind checking to show this warning:
$ valgrind -q --track-origins=yes
/mnt/sdb1/build-157335-lto-checking-valgrind/gcc/cc1 -fschedule-insns
-fsched-pressure testcase.c -quiet
==26448== Conditional jump or move depends on uninitialised value(s)
==26448== at 0xACFEE7: setup_insn_max_reg_pressure (haifa-sched.c:1589)
==26448== by 0x6CFA41: schedule_insns (sched-rgn.c:2965)
==26448== by 0x6CFC2D: rest_of_handle_sched (sched-rgn.c:3512)
==26448== by 0x679D8D: execute_one_pass (passes.c:1567)
==26448== by 0x679FF4: execute_pass_list (passes.c:1622)
==26448== by 0x67A006: execute_pass_list (passes.c:1623)
==26448== by 0x749E2F: tree_rest_of_compilation (tree-optimize.c:413)
==26448== by 0x876780: cgraph_expand_function (cgraphunit.c:1545)
==26448== by 0x87717F: cgraph_output_in_order (cgraphunit.c:1721)
==26448== by 0x8789D5: cgraph_optimize (cgraphunit.c:1869)
==26448== by 0x878BD4: cgraph_finalize_compilation_unit (cgraphunit.c:1093)
==26448== by 0x4A78CA: c_write_global_declarations (c-decl.c:9510)
==26448== Uninitialised value was created by a client request
==26448== at 0x4FC1AF: ggc_alloc_stat (ggc-page.c:1228)
==26448== by 0x6C06E0: rtx_alloc_stat (rtl.c:199)
==26448== by 0x597FDA: emit_barrier_after (emit-rtl.c:4481)
==26448== by 0x525B7A: expand_call (calls.c:2911)
==26448== by 0x50F2ED: expand_builtin (builtins.c:6403)
==26448== by 0x5AFF20: expand_expr_real_1 (expr.c:9247)
==26448== by 0x52E2EB: expand_gimple_stmt (cfgexpand.c:1783)
==26448== by 0x52F0D7: expand_gimple_basic_block (cfgexpand.c:3377)
==26448== by 0x532847: gimple_expand_cfg (cfgexpand.c:3826)
==26448== by 0x679D8D: execute_one_pass (passes.c:1567)
==26448== by 0x679FF4: execute_pass_list (passes.c:1622)
==26448== by 0x749E2F: tree_rest_of_compilation (tree-optimize.c:413)
==26448==
==26448== Conditional jump or move depends on uninitialised value(s)
==26448== at 0xACFEE7: setup_insn_max_reg_pressure (haifa-sched.c:1589)
==26448== by 0xAD4E42: schedule_insn (haifa-sched.c:1632)
==26448== by 0xAD7598: schedule_block (haifa-sched.c:3143)
==26448== by 0x6CFAA9: schedule_insns (sched-rgn.c:3001)
==26448== by 0x6CFC2D: rest_of_handle_sched (sched-rgn.c:3512)
==26448== by 0x679D8D: execute_one_pass (passes.c:1567)
==26448== by 0x679FF4: execute_pass_list (passes.c:1622)
==26448== by 0x67A006: execute_pass_list (passes.c:1623)
==26448== by 0x749E2F: tree_rest_of_compilation (tree-optimize.c:413)
==26448== by 0x876780: cgraph_expand_function (cgraphunit.c:1545)
==26448== by 0x87717F: cgraph_output_in_order (cgraphunit.c:1721)
==26448== by 0x8789D5: cgraph_optimize (cgraphunit.c:1869)
==26448== Uninitialised value was created by a client request
==26448== at 0x4FC1AF: ggc_alloc_stat (ggc-page.c:1228)
==26448== by 0x6C06E0: rtx_alloc_stat (rtl.c:199)
==26448== by 0x597FDA: emit_barrier_after (emit-rtl.c:4481)
==26448== by 0x525B7A: expand_call (calls.c:2911)
==26448== by 0x50F2ED: expand_builtin (builtins.c:6403)
==26448== by 0x5AFF20: expand_expr_real_1 (expr.c:9247)
==26448== by 0x52E2EB: expand_gimple_stmt (cfgexpand.c:1783)
==26448== by 0x52F0D7: expand_gimple_basic_block (cfgexpand.c:3377)
==26448== by 0x532847: gimple_expand_cfg (cfgexpand.c:3826)
==26448== by 0x679D8D: execute_one_pass (passes.c:1567)
==26448== by 0x679FF4: execute_pass_list (passes.c:1622)
==26448== by 0x749E2F: tree_rest_of_compilation (tree-optimize.c:413)
==26448==
--
Summary: valgrind warns about using uninitialized variable with -
fsched-pressure -fschedule-insns
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=43332
