Wrong insn scheduled by Sched1 pass

[Jojo R]

Hi,

From origin insn seqs, I think the insn 'r500=unspec[r100] 300’ is in
Good place because of the bypass of my pipeline description, it is not needed to schedule.

But the result of Sched1 pass schedule it,
I check the souce code of sched-rgn.c & haifa-sched.c

From compute_priorities() I think the dependence of insn consider dependence of register
Or memory first, but do not include any cpu resource conflict with defined by ‘define_cpu_unit'

Is there any way to control my case ?
Or my description of pipeline is not good ?
My gcc version is 8.1.0


insn seqs from Origin:

r80=VAL
r100=unspec[r80] 200

r81=VAL
r101=unspec[r81] 200

r500=unspec[r100] 300

r82=VAL
r102=unspec[r82] 200

r501=unspec[r101] 300
r502=unspec[r102] 300

------------------------

My pipeline like as:

(define_cpu_unit "ex1, ex2” "pipe_name")
(define_cpu_unit “tx” "pipe_name")

Insn unspec 200 as T1, latency is 12, use ex1,2
Insn unspec 300 as T2, latency is 12, use tx

(define_bypass 0 “T1” "T2")

------------------------

insn seqs after Sched1:

r80=VAL
r81=VAL
r82=VAL

r100=unspec[r80] 200
r101=unspec[r81] 200
r102=unspec[r82] 200

r500=unspec[r100] 300
r501=unspec[r101] 300
r502=unspec[r102] 300

Jojo