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...ng value after the loop. My apologies [vregs 76->111, 87->122]. 1. The interval for %vreg111 first covers nearly the entire function. Then it gets split into two intervals, where one covers the inner loops, which makes sense. selectOrSplit %vreg111 [68r,400B:1)[400B,688r:6)[688r,752B:4)[752B,1264r:6)[1264r,1312r:3)[1312r,1472B:2)[1472B,1520r:5)[1520r,3488B:0) 0 at 1520r 1 at 68r 2 at 1312r 3 at 1264r 4 at 688r 5 at 1472B-phi 6 at 400B-phi w=3.181050e-02 ... queuing new interval: %vreg121 [1764r,2936r:0)[2960B,2980r:0) 0 at 1764r queuing new interval: %vreg122 [68r,400B:0)[400B,688r:1)[688r...

...[vregs 76->111, 87->122]. >> >> 1. >> The interval for %vreg111 first covers nearly the entire function. Then it gets split into two intervals, where one covers the inner loops, which makes sense. >> selectOrSplit %vreg111 [68r,400B:1)[400B,688r:6)[688r,752B:4)[752B,1264r:6)[1264r,1312r:3)[1312r,1472B:2)[1472B,1520r:5)[1520r,3488B:0) 0 at 1520r 1 at 68r 2 at 1312r 3 at 1264r 4 at 688r 5 at 1472B-phi 6 at 400B-phi w=3.181050e-02 >> … >> queuing new interval: %vreg121 [1764r,2936r:0)[2960B,2980r:0) 0 at 1764r >> queuing new interval: %vreg122 [68r,...

Hi Quentin, I have tried to find a test case for an official target, but failed. It seems to be a rare case. To do it, I added the 'else' clause in the following: ... if (VNI->def == OrigVNI->def) { DEBUG(dbgs() << "orig phi value\n"); SVI->second.DefByOrigPHI = true; SVI->second.AllDefsAreReloads = false; propagateSiblingValue(SVI); continue;