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2013 Jul 02
0
[LLVMdev] SCEV update problem
...ton
corresponding to the SCEVUnknown in question.
ec2) it is up to the optimizer, which change the IR, update the SCEV
at once.
However, there are flaws:
ec1.f):
for ec1), it only invalidate an SCEVUnknown. The SCEVs that depends on
this SCEVUnknown are not autotmatically invalidated.
ec2.f1)
for ec2), sometimes optimizer are difficult to (efficiently)
figure out
which SCEVs need to be invalidated.
ec2.f2)
If the transformation take place in common utility functions, the
optimizer has no control at all. If we change the utility fun...