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26bf8f9a1b
Check that all the instructions are in the same basic block, that the EXTRACT_SUBREGs write to the same subregs that are being extracted, and that the source and destination registers are in the same regclass. Some of these constraints can be relaxed with a bit more work. Jakob suggested that the loop that checks for subregs when NewSubIdx != 0 should use the "nodbg" iterator, so I made that change here, too. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105437 91177308-0d34-0410-b5e6-96231b3b80d8
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