https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112971
--- Comment #3 from Robin Dapp <rdapp at gcc dot gnu.org> ---
In match.pd we do something like this:
;; Function e (e, funcdef_no=0, decl_uid=2751, cgraph_uid=1, symbol_order=4)
Pass statistics of "forwprop": ----------------
Matching expression match.pd:2771, gimple-match-2.cc:35
Matching expression match.pd:2774, gimple-match-1.cc:66
Matching expression match.pd:2781, gimple-match-2.cc:96
Aborting expression simplification due to deep recursion
Aborting expression simplification due to deep recursion
Applying pattern match.pd:6784, gimple-match-5.cc:1742
Applying pattern match.pd:6784, gimple-match-5.cc:1742
Applying pattern match.pd:6784, gimple-match-5.cc:1742
Applying pattern match.pd:6784, gimple-match-5.cc:1742
Applying pattern match.pd:6784, gimple-match-5.cc:1742
Applying pattern match.pd:6784, gimple-match-5.cc:1742
Applying pattern match.pd:6784, gimple-match-5.cc:1742
Applying pattern match.pd:6784, gimple-match-5.cc:1742
Applying pattern match.pd:6784, gimple-match-5.cc:1742
Applying pattern match.pd:6784, gimple-match-5.cc:1742
Applying pattern match.pd:6784, gimple-match-5.cc:1742
gimple_simplified to _53 = { 0, ... } & { 8, 7, 6, ... };
_63 = { 0, ... } & { -9, -8, -7, ... };
_52 = { 0, ... } & { 8, 7, 6, ... };
_74 = { 0, ... } & { -9, -8, -7, ... };
_38 = { 0, ... } & { 8, 7, 6, ... };
_40 = { 0, ... } & { -9, -8, -7, ... };
_55 = { 0, ... } & { 8, 7, 6, ... };
_57 = { 0, ... } & { -9, -8, -7, ... };
_65 = { 0, ... } & { 8, 7, 6, ... };
_72 = { 0, ... } & { -9, -8, -7, ... };
_32 = { 0, ... } & { 8, 7, 6, ... };
mask__6.19_61 = _32 == { 0, ... };
That doesn't look particularly backend related but we're trying to simplify a
mask so you never know...
