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Commit 0fe4608a authored by Eli Friedman's avatar Eli Friedman
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Re-commit r130862 with a minor change to avoid an iterator running off the edge in some cases. 

Original message:

Teach MachineCSE how to do simple cross-block CSE involving physregs.  This allows, for example, eliminating duplicate cmpl's on x86. Part of rdar://problem/8259436 .

llvm-svn: 130877
parent c7e4fa7c
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