https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115877
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Status|UNCONFIRMED |NEW
CC| |law at gcc dot gnu.org
Last reconfirmed| |2024-07-11
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Looks like ext_dce is doing something wrong:
Processing insn:
8: r107:SI=zero_extend(r105:HI)
REG_DEAD r105:HI
Trying to simplify pattern:
(zero_extend:SI (reg:HI 105 [ _2 ]))
rescanning insn with uid = 8.
Successfully transformed to:
(subreg:SI (reg:HI 105 [ _2 ]) 0)
I am not sure if that is valid.
Note 105 is defined as:
(insn 7 6 8 2 (set (reg:HI 105 [ _2 ])
(not:HI (reg:HI 106 [ uD.2773 ]))) "/app/example.cpp":7:8 933
{*one_cmplhi2_1}
(expr_list:REG_DEAD (reg:HI 106 [ uD.2773 ])
(expr_list:REG_EQUAL (not:HI (mem/c:HI (symbol_ref:DI ("u") [flags 0x2]
<var_decl 0x78f8cd010cf0 u>) [1 uD.2773+0 S2 A16]))
(nil))))
