Valgrind shows this fixes ~4 KB of leak per iteration (on x86_64) by
plugging this leak allocated at reginfo.c:1327:
gcc_obstack_init (&valid_mode_changes_obstack);
==57820== 16,256 bytes in 4 blocks are definitely lost in loss record 906 of 917
==57820== at 0x4A0645D: malloc (in
/usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==57820== by 0x59A6747: xmalloc (xmalloc.c:147)
==57820== by 0x30958842DB: _obstack_begin (obstack.c:184)
==57820== by 0x51C1EC1: init_subregs_of_mode() (reginfo.c:1327)
==57820== by 0x50D2A38: init_costs() (ira-costs.c:2181)
==57820== by 0x50D74A8: ira_costs() (ira-costs.c:2211)
==57820== by 0x50D1326: ira_build() (ira-build.c:3459)
==57820== by 0x50C909C: (anonymous namespace)::pass_ira::execute(function*)
(ira.c:5227)
==57820== by 0x51884F7: execute_one_pass(opt_pass*) (passes.c:2269)
==57820== by 0x5188B75: execute_pass_list_1(opt_pass*) (passes.c:2321)
==57820== by 0x5188B87: execute_pass_list_1(opt_pass*) (passes.c:2322)
==57820== by 0x5188BC8: execute_pass_list(function*, opt_pass*)
(passes.c:2332)
gcc/ChangeLog:
PR jit/63854
* reginfo.c (finish_subregs_of_mode): Replace obstack_finish with
obstack_free when cleaning up valid_mode_changes_obstack.
---
gcc/reginfo.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/gcc/reginfo.c b/gcc/reginfo.c
index efe23cd..c2daf22 100644
--- a/gcc/reginfo.c
+++ b/gcc/reginfo.c
@@ -1343,7 +1343,7 @@ void
finish_subregs_of_mode (void)
{
XDELETEVEC (valid_mode_changes);
- obstack_finish (&valid_mode_changes_obstack);
+ obstack_free (&valid_mode_changes_obstack, NULL);
}
/* Free all data attached to the structure. This isn't a destructor because
--
1.8.5.3
