Test m8d

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PPC m8d  (PPCMEightDep)
"LD;ST || LD;ST, hexa version, ppo dep (d tests in @xx)"
{
P0:r4=x ; P0:r5=y ;
P1:r4=x ; P1:r5=y ;
P2:r4=x ; P3:r5=y ;
P2:r2=2 ; P3:r2=2 ;
}

P0           |P1           |P2           |P3           ;
lwz r1,0(r4) |lwz r1,0(r5) |stw r2,0(r4) |stw r2,0(r5) ;
xor r9,r1,r1 |xor r9,r1,r1 |             |             ;
addi r2,r9,1 |addi r2,r9,1 |             |             ;
stw r2,0(r5) |stw r2,0(r4) |             |             ;
locations [0:r1; 1:r1; x; y;]
exists (true)