Eric Christopher 02050986d9 Expand invalid return values for umulo and smulo. Handle these similarly
to add/sub by doing the normal operation and then checking for overflow
afterwards. This generally relies on the DAG handling the later invalid
operations as well.

Fixes the 64-bit part of rdar://8622122 and rdar://8774702.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123908 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-20 08:54:28 +00:00
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