Bob Wilson a733daf18c Add some missing checks in TwoAddressInstructionPass::CoalesceExtSubRegs. ...

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.

llvm-svn: 105437

2010-06-03 23:53:58 +00:00

49 KiB

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