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2013 Oct 14
1
[LLVMdev] LiveInterval Questions
I have never quite understood the "phi def" concept of LiveInterval. I
understand that a phi def LiveRange originally came from a phi
instruction but I'm not sure how to use the information after phi
elimination.
For example, I have this LiveInterval:
[3472r,6688B:3)[6688B,8240B:2)[8240B,8976B:0)[8976B,12160B:1)[12160B,13744B:4)[13744B,14480B:5)[1448
0B,18048B:6)[18048B,19792B:7)[19792B,20192r:8) 0 at 8240B-phi 1 at 8976B-phi 2 at 6688B-phi 3 at 3472r 4 at 12160B
-phi 5 at 13744B-phi 6 at 14480B-phi 7 at 18048B-phi 8 at 19792B-phi
There is only one non-phi def. The (one...