Test Z6.4+poxxs

AArch64 Z6.4+poxxs
"PodWWXX WseXX PodWRXX FreXX PodWRXX FreXX"
Cycle=FreXX PodWWXX WseXX PodWRXX FreXX PodWRXX
Relax=
Safe=PodWW PodWR FreXX WseXX
Prefetch=0:x=F,0:y=W,1:y=F,1:z=T,2:z=F,2:x=T
Com=Ws Fr Fr
Orig=PodWWXX WseXX PodWRXX FreXX PodWRXX FreXX
{ ok=1;
0:X0=x; 0:X4=y; 0:X8=ok;
1:X0=y; 1:X4=z; 1:X7=ok;
2:X0=z; 2:X4=x; 2:X7=ok;
}
 P0              | P1              | P2              ;
 MOV W1,#1       | MOV W1,#2       | MOV W1,#1       ;
 LDXR W2,[X0]    | LDXR W2,[X0]    | LDXR W2,[X0]    ;
 STXR W3,W1,[X0] | STXR W3,W1,[X0] | STXR W3,W1,[X0] ;
 CBNZ W3,Fail0   | CBNZ W3,Fail1   | CBNZ W3,Fail2   ;
 MOV W5,#1       | LDXR W5,[X4]    | LDXR W5,[X4]    ;
 LDXR W6,[X4]    | STXR W3,W5,[X4] | STXR W3,W5,[X4] ;
 STXR W3,W5,[X4] | CBNZ W3,Fail1   | CBNZ W3,Fail2   ;
 CBNZ W3,Fail0   | B Exit1         | B Exit2         ;
 B Exit0         | Fail1:          | Fail2:          ;
 Fail0:          | MOV W6,#0       | MOV W6,#0       ;
 MOV W7,#0       | STR W6,[X7]     | STR W6,[X7]     ;
 STR W7,[X8]     | Exit1:          | Exit2:          ;
 Exit0:          |                 |                 ;
Observed
    z=1; y=2; x=1; ok=1; 2:X5=0; 2:X2=0; 1:X5=0; 1:X2=1; 0:X6=0; 0:X2=0;
and z=1; y=2; x=1; ok=0; 2:X5=0; 2:X2=0; 1:X5=0; 1:X2=1; 0:X6=0; 0:X2=0;
and z=1; y=2; x=1; ok=0; 2:X5=0; 2:X2=0; 1:X5=0; 1:X2=0; 0:X6=0; 0:X2=0;