[Bug rtl-optimization/94421] [memory free] bug related to predication speculative schedule

[xuemaosheng at huawei dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94421

otcmaf <xuemaosheng at huawei dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |xuemaosheng at huawei dot com

--- Comment #2 from otcmaf <xuemaosheng at huawei dot com> ---
In our case, the compile bug is called from function update_dep.  Variable
was_spec is true, dep_spec_p (dep) is false, current_sched_info->flags &
DO_SPECULATION is zero, DEP_STATUS (dep) & SPECULATIVE is zero.  So in this
case, we should avoid to free the memory of spec_dependency_cache.

1191      if (was_spec && !dep_spec_p (dep))
1192        /* The old dep was speculative, but now it isn't.  */
1193        change_spec_dep_to_hard (sd_it);
1194    

(gdb) p was_spec
$11 = true
(gdb) p dep_spec_p (dep)
$12 = false
(gdb) p current_sched_info->flags & DO_SPECULATION
$13 = 0
(gdb) p DEP_STATUS (dep) & SPECULATIVE
$14 = 0
(gdb) p !dep_spec_p (dep)
$15 = true