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Jakob Stoklund Olesen
0488d6ee5d
Handle sub-register operands in recomputeRegClass().
Now that getMatchingSuperRegClass() returns accurate results, it can be used to compute constraints imposed by instructions using a sub-register of a virtual register. This means we can recompute the register class of any virtual register by combining the constraints from all its uses. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146874 91177308-0d34-0410-b5e6-96231b3b80d8
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