https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95674
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
CC| |jakub at gcc dot gnu.org,
| |vmakarov at gcc dot gnu.org
Ever confirmed|0 |1
Last reconfirmed| |2020-06-15
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The insn in question is:
(define_insn ("*umuldi3_highpart_1")
[
(set (match_operand:DI 0 ("register_operand") ("=d"))
(truncate:DI (lshiftrt:TI (mult:TI (zero_extend:TI
(match_operand:DI 1 ("nonimmediate_operand") ("%a")))
(zero_extend:TI (match_operand:DI 2
("nonimmediate_operand") ("rm"))))
(const_int 64 [0x40]))))
(clobber (match_scratch:DI 3 ("=1")))
(clobber (reg:CC 17))
] ("TARGET_64BIT
and I don't see why the RA couldn't choose the args the other way, perhaps the
match_scratch =1 (i.e. "a" constraint) complicates it, but the constant is
REG_DEAD in that insn.
Vlad, could you please have a look? Thanks.
