https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90930
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot
gnu.org
--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
OK, so this is
UA_StatusCode ua_namespace0(UA_Server *server) {
UA_StatusCode retVal = 0x00;
UA_UInt16 ns[1];
ns[0] = UA_Server_addNamespace(server, "http://opcfoundation.org/UA/";);
retVal |= function_ua_namespace0_0_begin(server, ns);
retVal |= function_ua_namespace0_1_begin(server, ns);
retVal |= function_ua_namespace0_2_begin(server, ns);
retVal |= function_ua_namespace0_3_begin(server, ns);
...
retVal |= function_ua_namespace0_3832_begin(server, ns);
retVal |= function_ua_namespace0_3833_begin(server, ns);
retVal |= function_ua_namespace0_3834_begin(server, ns);
retVal |= function_ua_namespace0_3834_finish(server, ns);
retVal |= function_ua_namespace0_3833_finish(server, ns);
retVal |= function_ua_namespace0_3832_finish(server, ns);
retVal |= function_ua_namespace0_3831_finish(server, ns);
...
retVal |= function_ua_namespace0_3_finish(server, ns);
retVal |= function_ua_namespace0_2_finish(server, ns);
retVal |= function_ua_namespace0_1_finish(server, ns);
retVal |= function_ua_namespace0_0_finish(server, ns);
return retVal;
}
And on aarch64 before reassoc we have
_69005 = _80495 | _80496;
_26564 = MEM[(UA_UInt16 *)&ns];
_22992 = function_ua_namespace0_7_finish.isra.0 (server_3(D), _26564);
_26565 = MEM[(UA_UInt16 *)&ns];
_22995 = function_ua_namespace0_6_finish.isra.0 (server_3(D), _26565);
_69006 = _22995 | _22992;
_57512 = _69005 | _69006;
thus non-left-associative |s which we first linearize and then
re-write into two-assoc-width. The latter process is what leaves
stmts not marked as visited and thus we re-process things over and over...
reproducible on x86 with --param tree-reassoc-width=2.
tree reassociation : 23.01 ( 55%) 8.65 ( 57%) 31.25 ( 55%)
444709 kB ( 64%)
and with the fix:
tree reassociation : 0.04 ( 1%) 0.02 ( 8%) 0.06 ( 1%)
949 kB ( 7%)
