https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122504
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
```
Trying 6 -> 7:
6: r92:DI=`f1'
REG_EQUAL `f1'
7: call [r92:DI] argc:0
REG_DEAD r92:DI
REG_CALL_DECL `f1'
Successfully matched this instruction:
(parallel [
(call (mem:DI (symbol_ref:DI ("f1") [flags 0x41] <function_decl
0x793a1bc28000 f1>) [0 f1 S8 A8])
(const_int 0 [0]))
(clobber (reg:DI 30 x30))
])
allowing combination of insns 6 and 7
original costs 4 + 0 = 0
replacement cost 0
deferring deletion of insn with uid = 6.
modifying insn i3 7: call [`f1'] argc:0
REG_CALL_DECL `f1'
deferring rescan insn with uid = 7.
```
is the cause.
That is due to r8-685-g47210a041b3b40 .
