On Fri, Jan 16, 2009 at 12:47 PM, Andrew Pinski <pins...@gmail.com> wrote:
> On Fri, Jan 16, 2009 at 11:35 AM, Jack Lloyd <ll...@randombit.net> wrote:
>> According to the info docs, the Alpha has __builtin_alpha_rpcc which
>> doesn't take any inputs either, and should just call rpcc much as an
>> rdtsc intrinsic would, so it may provide a more direct model.
>
> (define_insn "builtin_rpcc"
> [(set (match_operand:DI 0 "register_operand" "=r")
> (unspec_volatile:DI [(const_int 0)] UNSPECV_RPCC))]
> ""
> "rpcc %0"
> [(set_attr "type" "ilog")])
>
> So yes this is exactly what I was mentioning to do ...
>
The problem is 64bit. I have
(define_insn "*rdtsc_rex64"
[(parallel [(set (match_operand:DI 0 "register_operand" "=a")
(unspec_volatile:DI [(const_int 0)] UNSPECV_RDTSC_EAX))
(set (match_operand:DI 1 "register_operand" "=d")
(unspec_volatile:DI [(const_int 0)] UNSPECV_RDTSC_EDX))])]
"TARGET_64BIT"
"rdtsc"
[(set_attr "type" "other")
(set_attr "length" "2")])
But I got
y.c: In function 'foo2':
y.c:7: error: unrecognizable insn:
(insn 5 4 6 3 y.c:6 (parallel [
(set (reg:DI 62)
(unspec_volatile [
(const_int 0 [0x0])
] 19))
(set (reg:DI 61)
(unspec_volatile [
(const_int 0 [0x0])
] 20))
]) -1 (nil))
y.c:7: internal compiler error: in extract_insn, at recog.c:2027
Please submit a full bug report,
It looks like I can't use 2 unspec_volatile SETs in one RTL.
--
H.J.
