https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100693
Will Schmidt changed:
What|Removed |Added
CC||willschm at gcc dot gnu.org
--- Comment #2 from Will Schmidt ---
(In reply to Segher Boessenkool from comment #1)
> Confirmed. The define_insn for it is for SImode only as well.
I see the SImode for the define as mentioned
(define_insn "addg6s"
[(set (match_operand:SI 0 "register_operand" "=r")
(unspec:SI [(match_operand:SI 1 "register_operand" "r")
(match_operand:SI 2 "register_operand" "r")]
UNSPEC_ADDG6S))]
"TARGET_POPCNTD"
"addg6s %0,%1,%2"
[(set_attr "type" "integer")])
But.. a simple testcase with unsigned long long parms builds ok. (both gcc 11
and older gcc 9).
unsigned long long bcd_arith_longlong (unsigned long long a, unsigned long long
b)
{
return __builtin_addg6s (a, b);
}
Expand shows.. this instruction is using a subset, erm, subreg of the inputs.
Is this expected behavior?
(insn 11 10 12 2 (set (reg:SI 128)
(unspec:SI [
(subreg/s/v:SI (reg:DI 121 [ _1 ]) 0)
(subreg/s/v:SI (reg:DI 122 [ _2 ]) 0)
] UNSPEC_ADDG6S)) "./addg6s.c":11:16 -1
(nil))
